diff --git a/devel/.buildinfo b/devel/.buildinfo
index ed6dfcaf09..e6c9993ccb 100644
--- a/devel/.buildinfo
+++ b/devel/.buildinfo
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+config: fbfe5a2b7ec5487916ea4abb84f238de
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diff --git a/devel/_modules/collections/abc.html b/devel/_modules/collections/abc.html
index c71b602edd..0d14e864a4 100644
--- a/devel/_modules/collections/abc.html
+++ b/devel/_modules/collections/abc.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>collections.abc - linearmodels v6.1 (+13)</title>
+        <title>collections.abc - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -185,10 +185,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/_modules/functools.html b/devel/_modules/functools.html
index 5dd973b99a..07059aa981 100644
--- a/devel/_modules/functools.html
+++ b/devel/_modules/functools.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>functools - linearmodels v6.1 (+13)</title>
+        <title>functools - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
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   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/_modules/index.html b/devel/_modules/index.html
index 841248070c..b0ee261ada 100644
--- a/devel/_modules/index.html
+++ b/devel/_modules/index.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Overview: module code - linearmodels v6.1 (+13)</title>
+        <title>Overview: module code - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
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@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/_modules/linearmodels/asset_pricing/covariance.html b/devel/_modules/linearmodels/asset_pricing/covariance.html
index d4c7c5112f..25ee1b9457 100644
--- a/devel/_modules/linearmodels/asset_pricing/covariance.html
+++ b/devel/_modules/linearmodels/asset_pricing/covariance.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.covariance - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.covariance - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
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-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/_modules/linearmodels/asset_pricing/model.html b/devel/_modules/linearmodels/asset_pricing/model.html
index aa48278758..f23d427331 100644
--- a/devel/_modules/linearmodels/asset_pricing/model.html
+++ b/devel/_modules/linearmodels/asset_pricing/model.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.model - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.model - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/_modules/linearmodels/asset_pricing/results.html b/devel/_modules/linearmodels/asset_pricing/results.html
index ad2a715b27..3ba1b5d9f1 100644
--- a/devel/_modules/linearmodels/asset_pricing/results.html
+++ b/devel/_modules/linearmodels/asset_pricing/results.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/_modules/linearmodels/compat/statsmodels.html b/devel/_modules/linearmodels/compat/statsmodels.html
index 07c96e82a5..a5ff1549ba 100644
--- a/devel/_modules/linearmodels/compat/statsmodels.html
+++ b/devel/_modules/linearmodels/compat/statsmodels.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.compat.statsmodels - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.compat.statsmodels - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/_modules/linearmodels/iv/absorbing.html b/devel/_modules/linearmodels/iv/absorbing.html
index 1aca108df6..64e1190da1 100644
--- a/devel/_modules/linearmodels/iv/absorbing.html
+++ b/devel/_modules/linearmodels/iv/absorbing.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/_modules/linearmodels/iv/covariance.html b/devel/_modules/linearmodels/iv/covariance.html
index 6129936a90..b7cb70318e 100644
--- a/devel/_modules/linearmodels/iv/covariance.html
+++ b/devel/_modules/linearmodels/iv/covariance.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.covariance - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.covariance - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/_modules/linearmodels/iv/data.html b/devel/_modules/linearmodels/iv/data.html
index 30a9222bb9..d90ee6ef33 100644
--- a/devel/_modules/linearmodels/iv/data.html
+++ b/devel/_modules/linearmodels/iv/data.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.data - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.data - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/_modules/linearmodels/iv/gmm.html b/devel/_modules/linearmodels/iv/gmm.html
index 0cbf25cc84..f33844b1a3 100644
--- a/devel/_modules/linearmodels/iv/gmm.html
+++ b/devel/_modules/linearmodels/iv/gmm.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.gmm - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.gmm - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/_modules/linearmodels/iv/model.html b/devel/_modules/linearmodels/iv/model.html
index ee32267b6b..ccbb1be6a9 100644
--- a/devel/_modules/linearmodels/iv/model.html
+++ b/devel/_modules/linearmodels/iv/model.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.model - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.model - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/_modules/linearmodels/iv/results.html b/devel/_modules/linearmodels/iv/results.html
index 10b2711cc9..8fe9e7d327 100644
--- a/devel/_modules/linearmodels/iv/results.html
+++ b/devel/_modules/linearmodels/iv/results.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/_modules/linearmodels/panel/covariance.html b/devel/_modules/linearmodels/panel/covariance.html
index 972c58a090..83c59a75e4 100644
--- a/devel/_modules/linearmodels/panel/covariance.html
+++ b/devel/_modules/linearmodels/panel/covariance.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.covariance - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.covariance - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/_modules/linearmodels/panel/data.html b/devel/_modules/linearmodels/panel/data.html
index 813a24ee53..ed04896e17 100644
--- a/devel/_modules/linearmodels/panel/data.html
+++ b/devel/_modules/linearmodels/panel/data.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/_modules/linearmodels/panel/model.html b/devel/_modules/linearmodels/panel/model.html
index d73b94293f..67eb3256a7 100644
--- a/devel/_modules/linearmodels/panel/model.html
+++ b/devel/_modules/linearmodels/panel/model.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.model - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.model - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/_modules/linearmodels/panel/results.html b/devel/_modules/linearmodels/panel/results.html
index fed4500312..e8b3c0f942 100644
--- a/devel/_modules/linearmodels/panel/results.html
+++ b/devel/_modules/linearmodels/panel/results.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/_modules/linearmodels/panel/utility.html b/devel/_modules/linearmodels/panel/utility.html
index 125a644bdc..b64d0a1148 100644
--- a/devel/_modules/linearmodels/panel/utility.html
+++ b/devel/_modules/linearmodels/panel/utility.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.utility - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.utility - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/_modules/linearmodels/shared/covariance.html b/devel/_modules/linearmodels/shared/covariance.html
index d72b2c2e58..54a5fd97bf 100644
--- a/devel/_modules/linearmodels/shared/covariance.html
+++ b/devel/_modules/linearmodels/shared/covariance.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.shared.covariance - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.shared.covariance - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/_modules/linearmodels/shared/hypotheses.html b/devel/_modules/linearmodels/shared/hypotheses.html
index c97a25dc03..d67cfe6cf1 100644
--- a/devel/_modules/linearmodels/shared/hypotheses.html
+++ b/devel/_modules/linearmodels/shared/hypotheses.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.shared.hypotheses - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.shared.hypotheses - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/_modules/linearmodels/shared/utility.html b/devel/_modules/linearmodels/shared/utility.html
index 6ff17e8d8d..9f8752eef6 100644
--- a/devel/_modules/linearmodels/shared/utility.html
+++ b/devel/_modules/linearmodels/shared/utility.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.shared.utility - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.shared.utility - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/_modules/linearmodels/system/_utility.html b/devel/_modules/linearmodels/system/_utility.html
index f66e256a5d..84dea9298b 100644
--- a/devel/_modules/linearmodels/system/_utility.html
+++ b/devel/_modules/linearmodels/system/_utility.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system._utility - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system._utility - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/_modules/linearmodels/system/covariance.html b/devel/_modules/linearmodels/system/covariance.html
index 4b62cb960a..ffc808053f 100644
--- a/devel/_modules/linearmodels/system/covariance.html
+++ b/devel/_modules/linearmodels/system/covariance.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.covariance - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.covariance - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/_modules/linearmodels/system/gmm.html b/devel/_modules/linearmodels/system/gmm.html
index 6245828196..8bb1e3ac74 100644
--- a/devel/_modules/linearmodels/system/gmm.html
+++ b/devel/_modules/linearmodels/system/gmm.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.gmm - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.gmm - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/_modules/linearmodels/system/model.html b/devel/_modules/linearmodels/system/model.html
index c0069c289f..54fd37b552 100644
--- a/devel/_modules/linearmodels/system/model.html
+++ b/devel/_modules/linearmodels/system/model.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.model - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.model - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/_modules/linearmodels/system/results.html b/devel/_modules/linearmodels/system/results.html
index d2ab4be2fe..2f876d4520 100644
--- a/devel/_modules/linearmodels/system/results.html
+++ b/devel/_modules/linearmodels/system/results.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/_modules/statsmodels/iolib/summary.html b/devel/_modules/statsmodels/iolib/summary.html
index 73cb3b8a66..2e4b981e3e 100644
--- a/devel/_modules/statsmodels/iolib/summary.html
+++ b/devel/_modules/statsmodels/iolib/summary.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>statsmodels.iolib.summary - linearmodels v6.1 (+13)</title>
+        <title>statsmodels.iolib.summary - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/_sources/changes/6.0.rst.txt b/devel/_sources/changes/6.0.rst.txt
index 594ee03edb..49410427d2 100644
--- a/devel/_sources/changes/6.0.rst.txt
+++ b/devel/_sources/changes/6.0.rst.txt
@@ -1,5 +1,11 @@
 Version 6.0
-------------
+-----------
+* Fixes for the removal of the ``.A`` shorthand for ``.toarray()`` for sparse arrays
+* Small doc fixes
+* Support Python 3.13
+
+Version 6.0
+-----------
 
 * Increased minimums:
 
diff --git a/devel/_static/documentation_options.js b/devel/_static/documentation_options.js
index c1d3d172ae..d3a6ab7314 100644
--- a/devel/_static/documentation_options.js
+++ b/devel/_static/documentation_options.js
@@ -1,5 +1,5 @@
 const DOCUMENTATION_OPTIONS = {
-    VERSION: 'v6.1 (+13)',
+    VERSION: 'v6.1 (+15)',
     LANGUAGE: 'en',
     COLLAPSE_INDEX: false,
     BUILDER: 'html',
diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.config.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.config.html
index 1babb1d930..bef520b311 100644
--- a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.config.html
+++ b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.config.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.config - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.config - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.cov.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.cov.html
index 1f86d73804..943f4ceeb2 100644
--- a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.cov.html
+++ b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.cov.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.cov - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.cov - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.html
index f65265e9fe..b46d287ef9 100644
--- a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.html
+++ b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.covariance.HeteroskedasticCovariance - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.covariance.HeteroskedasticCovariance - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.inv_jacobian.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.inv_jacobian.html
index 82ec8303be..6c7b2740e1 100644
--- a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.inv_jacobian.html
+++ b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.inv_jacobian.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.inv_jacobian - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.inv_jacobian - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
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+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.jacobian.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.jacobian.html
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.jacobian - linearmodels v6.1 (+15)</title>
       
     
 
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@@ -103,7 +103,7 @@
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+            linearmodels v6.1 (+15)
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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+            linearmodels v6.1 (+15)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.square - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.covariance.HeteroskedasticCovariance.square - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+            linearmodels v6.1 (+15)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.KernelCovariance.bandwidth.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.KernelCovariance.bandwidth.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.covariance.KernelCovariance.bandwidth - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.covariance.KernelCovariance.bandwidth - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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+            linearmodels v6.1 (+15)
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.KernelCovariance.config.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.KernelCovariance.config.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.covariance.KernelCovariance.config - linearmodels v6.1 (+13)</title>
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@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.KernelCovariance.cov.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.KernelCovariance.cov.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.covariance.KernelCovariance.cov - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.covariance.KernelCovariance.cov - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.KernelCovariance.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.KernelCovariance.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.covariance.KernelCovariance - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.covariance.KernelCovariance - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.KernelCovariance.inv_jacobian.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.KernelCovariance.inv_jacobian.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.covariance.KernelCovariance.inv_jacobian - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.covariance.KernelCovariance.inv_jacobian - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.KernelCovariance.jacobian.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.KernelCovariance.jacobian.html
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--- a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.KernelCovariance.jacobian.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.covariance.KernelCovariance.jacobian - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.covariance.KernelCovariance.jacobian - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.KernelCovariance.kernel.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.KernelCovariance.kernel.html
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+++ b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.KernelCovariance.kernel.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.covariance.KernelCovariance.kernel - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.covariance.KernelCovariance.kernel - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.KernelCovariance.s.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.KernelCovariance.s.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.covariance.KernelCovariance.s - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.covariance.KernelCovariance.s - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.KernelCovariance.square.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.covariance.KernelCovariance.square.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.covariance.KernelCovariance.square - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.covariance.KernelCovariance.square - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.LinearFactorModel.fit.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.LinearFactorModel.fit.html
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.asset_pricing.model.LinearFactorModel.fit - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.LinearFactorModel.formula.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.LinearFactorModel.formula.html
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.asset_pricing.model.LinearFactorModel.formula - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.LinearFactorModel.from_formula.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.LinearFactorModel.from_formula.html
index 26068b88ba..719a3af40c 100644
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.asset_pricing.model.LinearFactorModel.from_formula - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.LinearFactorModel.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.LinearFactorModel.html
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.asset_pricing.model.LinearFactorModel - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.LinearFactorModelGMM.fit.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.LinearFactorModelGMM.fit.html
index d5e414e571..642bf90e10 100644
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+++ b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.LinearFactorModelGMM.fit.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.model.LinearFactorModelGMM.fit - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.model.LinearFactorModelGMM.fit - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.LinearFactorModelGMM.formula.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.LinearFactorModelGMM.formula.html
index 885428305c..3aa24f2709 100644
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.model.LinearFactorModelGMM.formula - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.model.LinearFactorModelGMM.formula - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.LinearFactorModelGMM.from_formula.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.LinearFactorModelGMM.from_formula.html
index 97c09d3e73..c2bf5adfbd 100644
--- a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.LinearFactorModelGMM.from_formula.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.model.LinearFactorModelGMM.from_formula - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.model.LinearFactorModelGMM.from_formula - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.LinearFactorModelGMM.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.LinearFactorModelGMM.html
index d611ff4301..99c0620f72 100644
--- a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.LinearFactorModelGMM.html
+++ b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.LinearFactorModelGMM.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.model.LinearFactorModelGMM - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.model.LinearFactorModelGMM - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.TradedFactorModel.fit.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.TradedFactorModel.fit.html
index ad372836cd..22a62f835f 100644
--- a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.TradedFactorModel.fit.html
+++ b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.TradedFactorModel.fit.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.model.TradedFactorModel.fit - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.model.TradedFactorModel.fit - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.TradedFactorModel.formula.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.TradedFactorModel.formula.html
index 6d4e776d4c..5816f7bb7d 100644
--- a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.TradedFactorModel.formula.html
+++ b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.TradedFactorModel.formula.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.model.TradedFactorModel.formula - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.model.TradedFactorModel.formula - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.TradedFactorModel.from_formula.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.TradedFactorModel.from_formula.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.model.TradedFactorModel.from_formula - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.model.TradedFactorModel.from_formula - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.TradedFactorModel.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.TradedFactorModel.html
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--- a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.TradedFactorModel.html
+++ b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.model.TradedFactorModel.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.model.TradedFactorModel - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.model.TradedFactorModel - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.GMMFactorModelResults.alphas.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.GMMFactorModelResults.alphas.html
index 3f1a84cfb9..2ba9cb3afa 100644
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.GMMFactorModelResults.alphas - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.GMMFactorModelResults.alphas - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.GMMFactorModelResults.betas.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.GMMFactorModelResults.betas.html
index 96b620b85d..706d000bec 100644
--- a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.GMMFactorModelResults.betas.html
+++ b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.GMMFactorModelResults.betas.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.GMMFactorModelResults.betas - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.GMMFactorModelResults.betas - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.GMMFactorModelResults.cov.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.GMMFactorModelResults.cov.html
index 07af347178..25c7014e15 100644
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+++ b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.GMMFactorModelResults.cov.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.GMMFactorModelResults.cov - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.GMMFactorModelResults.cov - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.GMMFactorModelResults.cov_estimator.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.GMMFactorModelResults.cov_estimator.html
index a6e9346eab..fc73ffc225 100644
--- a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.GMMFactorModelResults.cov_estimator.html
+++ b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.GMMFactorModelResults.cov_estimator.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.GMMFactorModelResults.cov_estimator - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.GMMFactorModelResults.cov_estimator - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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+    linearmodels v6.1 (+15)
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+++ b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.GMMFactorModelResults.full_summary.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.GMMFactorModelResults.full_summary - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.GMMFactorModelResults.full_summary - linearmodels v6.1 (+15)</title>
       
     
 
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.GMMFactorModelResults.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.GMMFactorModelResults.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.GMMFactorModelResults - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.GMMFactorModelResults - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.GMMFactorModelResults.iterations - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.GMMFactorModelResults.iterations - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.asset_pricing.results.GMMFactorModelResults.j_statistic - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.asset_pricing.results.GMMFactorModelResults.params - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.GMMFactorModelResults.pvalues.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.GMMFactorModelResults.pvalues.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.GMMFactorModelResults.pvalues - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.GMMFactorModelResults.pvalues - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.asset_pricing.results.GMMFactorModelResults.residual_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
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+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.asset_pricing.results.GMMFactorModelResults.risk_premia_se - linearmodels v6.1 (+15)</title>
       
     
 
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+            linearmodels v6.1 (+15)
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.GMMFactorModelResults.risk_premia_tstats.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.GMMFactorModelResults.risk_premia_tstats.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.GMMFactorModelResults.risk_premia_tstats - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.GMMFactorModelResults.risk_premia_tstats - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.GMMFactorModelResults.rsquared - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.GMMFactorModelResults.rsquared - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.GMMFactorModelResults.summary.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.GMMFactorModelResults.summary.html
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.asset_pricing.results.GMMFactorModelResults.total_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.GMMFactorModelResults.tstats.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.GMMFactorModelResults.tstats.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.GMMFactorModelResults.tstats - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.GMMFactorModelResults.tstats - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.alphas.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.alphas.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.alphas - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.alphas - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.betas.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.betas.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.betas - linearmodels v6.1 (+13)</title>
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@@ -93,7 +93,7 @@
 
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+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.cov - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.cov - linearmodels v6.1 (+15)</title>
       
     
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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+            linearmodels v6.1 (+15)
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.cov_estimator - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.cov_estimator - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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+            linearmodels v6.1 (+15)
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.full_summary - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.LinearFactorModelResults - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.LinearFactorModelResults - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.j_statistic - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
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+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.nobs.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.nobs.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.nobs - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.nobs - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
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+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.params.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.params.html
index 966552b2d9..41034c651c 100644
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.params - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.params - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.pvalues.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.pvalues.html
index 5668b2bd4f..012b6ed22a 100644
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.pvalues - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.pvalues - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
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+            linearmodels v6.1 (+15)
           </span>
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.residual_ss.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.residual_ss.html
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--- a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.residual_ss.html
+++ b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.residual_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.residual_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.residual_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.risk_premia.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.risk_premia.html
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+++ b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.risk_premia.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.risk_premia - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.risk_premia - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.risk_premia_se.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.risk_premia_se.html
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--- a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.risk_premia_se.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.risk_premia_se - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.risk_premia_se - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.risk_premia_tstats.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.risk_premia_tstats.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.risk_premia_tstats - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.risk_premia_tstats - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.rsquared.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.rsquared.html
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--- a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.rsquared.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.rsquared - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.rsquared - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.std_errors.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.std_errors.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.std_errors - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.std_errors - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.summary.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.summary.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.summary - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.summary - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.total_ss.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.total_ss.html
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+++ b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.total_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.total_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.total_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.tstats.html b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.tstats.html
index 3033561a37..53188119bb 100644
--- a/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.tstats.html
+++ b/devel/asset-pricing/asset-pricing/linearmodels.asset_pricing.results.LinearFactorModelResults.tstats.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.tstats - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.asset_pricing.results.LinearFactorModelResults.tstats - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/asset-pricing/examples/examples.html b/devel/asset-pricing/examples/examples.html
index 3a8b26f35d..e02e85974f 100644
--- a/devel/asset-pricing/examples/examples.html
+++ b/devel/asset-pricing/examples/examples.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Examples - linearmodels v6.1 (+13)</title>
+        <title>Examples - linearmodels v6.1 (+15)</title>
       
     
 
@@ -94,7 +94,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -104,7 +104,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -191,10 +191,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
@@ -789,7 +789,7 @@ <h2 id="1-Step-Estimation-using-Seemingly-Unrelated-Regression-(SUR)">1-Step Est
 No. Factors:                          1   J-statistic:                    70.034
 No. Observations:                   819   P-value                         0.0000
 Date:                  Tue, Sep 24 2024   Distribution:                  chi2(9)
-Time:                          09:24:28
+Time:                          09:28:40
 Cov. Estimator:                  robust
 
                             Risk Premia Estimates
@@ -828,7 +828,7 @@ <h2 id="1-Step-Estimation-using-Seemingly-Unrelated-Regression-(SUR)">1-Step Est
 No. Factors:                          3   J-statistic:                    53.271
 No. Observations:                   819   P-value                         0.0000
 Date:                  Tue, Sep 24 2024   Distribution:                  chi2(9)
-Time:                          09:24:28
+Time:                          09:28:40
 Cov. Estimator:                  robust
 
                             Risk Premia Estimates
@@ -882,7 +882,7 @@ <h2 id="1-Step-Estimation-using-Seemingly-Unrelated-Regression-(SUR)">1-Step Est
 No. Factors:                          3   J-statistic:                    61.617
 No. Observations:                   819   P-value                         0.0000
 Date:                  Tue, Sep 24 2024   Distribution:                 chi2(12)
-Time:                          09:24:28
+Time:                          09:28:40
 Cov. Estimator:                  robust
 
                             Risk Premia Estimates
@@ -1015,7 +1015,7 @@ <h2 id="2-Step-Estimation">2-Step Estimation<a class="headerlink" href="#2-Step-
 No. Factors:                          4   J-statistic:                    36.929
 No. Observations:                   819   P-value                         0.0000
 Date:                  Tue, Sep 24 2024   Distribution:                  chi2(5)
-Time:                          09:24:32
+Time:                          09:28:41
 Cov. Estimator:                  robust
 
                             Risk Premia Estimates
@@ -1106,7 +1106,7 @@ <h2 id="2-Step-Estimation">2-Step Estimation<a class="headerlink" href="#2-Step-
 No. Factors:                          3   J-statistic:                    36.406
 No. Observations:                   819   P-value                         0.0000
 Date:                  Tue, Sep 24 2024   Distribution:                  chi2(6)
-Time:                          09:24:32
+Time:                          09:28:41
 Cov. Estimator:                  robust
 
                             Risk Premia Estimates
@@ -1151,7 +1151,7 @@ <h2 id="2-Step-Estimation">2-Step Estimation<a class="headerlink" href="#2-Step-
 No. Factors:                          3   J-statistic:                    36.003
 No. Observations:                   819   P-value                         0.0000
 Date:                  Tue, Sep 24 2024   Distribution:                  chi2(5)
-Time:                          09:24:32
+Time:                          09:28:41
 Cov. Estimator:                  robust
 
                             Risk Premia Estimates
@@ -1191,7 +1191,7 @@ <h2 id="2-Step-Estimation">2-Step Estimation<a class="headerlink" href="#2-Step-
 No. Factors:                          3   J-statistic:                    25.841
 No. Observations:                   819   P-value                         0.0002
 Date:                  Tue, Sep 24 2024   Distribution:                  chi2(6)
-Time:                          09:24:32
+Time:                          09:28:42
 Cov. Estimator:                  kernel
 
                             Risk Premia Estimates
@@ -1267,7 +1267,7 @@ <h2 id="GMM-Estimation">GMM Estimation<a class="headerlink" href="#GMM-Estimatio
 No. Factors:                          3   J-statistic:                    22.067
 No. Observations:                   819   P-value                         0.0012
 Date:                  Tue, Sep 24 2024   Distribution:                  chi2(6)
-Time:                          09:24:35
+Time:                          09:28:44
 Cov. Estimator:                  robust
 
                             Risk Premia Estimates
@@ -1315,7 +1315,7 @@ <h2 id="GMM-Estimation">GMM Estimation<a class="headerlink" href="#GMM-Estimatio
 No. Factors:                          3   J-statistic:                    13.833
 No. Observations:                   819   P-value                         0.0316
 Date:                  Tue, Sep 24 2024   Distribution:                  chi2(6)
-Time:                          09:24:39
+Time:                          09:28:49
 Cov. Estimator:                  kernel
 
                             Risk Premia Estimates
@@ -1454,7 +1454,7 @@ <h3 id="Iterating-until-convergence">Iterating until convergence<a class="header
 No. Factors:                          3   J-statistic:                    22.089
 No. Observations:                   819   P-value                         0.0012
 Date:                  Tue, Sep 24 2024   Distribution:                  chi2(6)
-Time:                          09:24:44
+Time:                          09:28:54
 Cov. Estimator:                  robust
 
                             Risk Premia Estimates
@@ -1536,7 +1536,7 @@ <h3 id="Continuously-Updating-Estimator">Continuously Updating Estimator<a class
 No. Factors:                          3   J-statistic:                    22.719
 No. Observations:                   819   P-value                         0.0009
 Date:                  Tue, Sep 24 2024   Distribution:                  chi2(6)
-Time:                          09:24:54
+Time:                          09:29:06
 Cov. Estimator:                  robust
 
                             Risk Premia Estimates
diff --git a/devel/asset-pricing/examples/examples.ipynb b/devel/asset-pricing/examples/examples.ipynb
index e8c2ca25f8..b999516542 100644
--- a/devel/asset-pricing/examples/examples.ipynb
+++ b/devel/asset-pricing/examples/examples.ipynb
@@ -32,10 +32,10 @@
    "execution_count": 1,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:27.547142Z",
-     "iopub.status.busy": "2024-09-24T09:24:27.546773Z",
-     "iopub.status.idle": "2024-09-24T09:24:28.764445Z",
-     "shell.execute_reply": "2024-09-24T09:24:28.760638Z"
+     "iopub.execute_input": "2024-09-24T09:28:38.739470Z",
+     "iopub.status.busy": "2024-09-24T09:28:38.739174Z",
+     "iopub.status.idle": "2024-09-24T09:28:39.986172Z",
+     "shell.execute_reply": "2024-09-24T09:28:39.985016Z"
     }
    },
    "outputs": [
@@ -108,10 +108,10 @@
    "execution_count": 2,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:28.819416Z",
-     "iopub.status.busy": "2024-09-24T09:24:28.818308Z",
-     "iopub.status.idle": "2024-09-24T09:24:28.825636Z",
-     "shell.execute_reply": "2024-09-24T09:24:28.824920Z"
+     "iopub.execute_input": "2024-09-24T09:28:40.036168Z",
+     "iopub.status.busy": "2024-09-24T09:28:40.035831Z",
+     "iopub.status.idle": "2024-09-24T09:28:40.043070Z",
+     "shell.execute_reply": "2024-09-24T09:28:40.042407Z"
     }
    },
    "outputs": [],
@@ -137,10 +137,10 @@
    "execution_count": 3,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:28.830072Z",
-     "iopub.status.busy": "2024-09-24T09:24:28.829014Z",
-     "iopub.status.idle": "2024-09-24T09:24:28.849398Z",
-     "shell.execute_reply": "2024-09-24T09:24:28.848684Z"
+     "iopub.execute_input": "2024-09-24T09:28:40.046292Z",
+     "iopub.status.busy": "2024-09-24T09:28:40.046037Z",
+     "iopub.status.idle": "2024-09-24T09:28:40.063820Z",
+     "shell.execute_reply": "2024-09-24T09:28:40.063209Z"
     }
    },
    "outputs": [
@@ -154,7 +154,7 @@
       "No. Factors:                          1   J-statistic:                    70.034\n",
       "No. Observations:                   819   P-value                         0.0000\n",
       "Date:                  Tue, Sep 24 2024   Distribution:                  chi2(9)\n",
-      "Time:                          09:24:28                                         \n",
+      "Time:                          09:28:40                                         \n",
       "Cov. Estimator:                  robust                                         \n",
       "                                                                                \n",
       "                            Risk Premia Estimates                             \n",
@@ -196,10 +196,10 @@
    "execution_count": 4,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:28.853091Z",
-     "iopub.status.busy": "2024-09-24T09:24:28.852764Z",
-     "iopub.status.idle": "2024-09-24T09:24:28.876659Z",
-     "shell.execute_reply": "2024-09-24T09:24:28.875935Z"
+     "iopub.execute_input": "2024-09-24T09:28:40.067239Z",
+     "iopub.status.busy": "2024-09-24T09:28:40.066239Z",
+     "iopub.status.idle": "2024-09-24T09:28:40.115513Z",
+     "shell.execute_reply": "2024-09-24T09:28:40.114755Z"
     }
    },
    "outputs": [
@@ -213,7 +213,7 @@
       "No. Factors:                          3   J-statistic:                    53.271\n",
       "No. Observations:                   819   P-value                         0.0000\n",
       "Date:                  Tue, Sep 24 2024   Distribution:                  chi2(9)\n",
-      "Time:                          09:24:28                                         \n",
+      "Time:                          09:28:40                                         \n",
       "Cov. Estimator:                  robust                                         \n",
       "                                                                                \n",
       "                            Risk Premia Estimates                             \n",
@@ -250,10 +250,10 @@
    "execution_count": 5,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:28.880038Z",
-     "iopub.status.busy": "2024-09-24T09:24:28.879723Z",
-     "iopub.status.idle": "2024-09-24T09:24:28.929315Z",
-     "shell.execute_reply": "2024-09-24T09:24:28.928667Z"
+     "iopub.execute_input": "2024-09-24T09:28:40.120777Z",
+     "iopub.status.busy": "2024-09-24T09:28:40.120493Z",
+     "iopub.status.idle": "2024-09-24T09:28:40.189655Z",
+     "shell.execute_reply": "2024-09-24T09:28:40.188848Z"
     }
    },
    "outputs": [
@@ -267,7 +267,7 @@
       "No. Factors:                          3   J-statistic:                    61.617\n",
       "No. Observations:                   819   P-value                         0.0000\n",
       "Date:                  Tue, Sep 24 2024   Distribution:                 chi2(12)\n",
-      "Time:                          09:24:28                                         \n",
+      "Time:                          09:28:40                                         \n",
       "Cov. Estimator:                  robust                                         \n",
       "                                                                                \n",
       "                            Risk Premia Estimates                             \n",
@@ -318,10 +318,10 @@
    "execution_count": 6,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:28.935726Z",
-     "iopub.status.busy": "2024-09-24T09:24:28.935187Z",
-     "iopub.status.idle": "2024-09-24T09:24:28.952011Z",
-     "shell.execute_reply": "2024-09-24T09:24:28.949525Z"
+     "iopub.execute_input": "2024-09-24T09:28:40.196067Z",
+     "iopub.status.busy": "2024-09-24T09:28:40.195770Z",
+     "iopub.status.idle": "2024-09-24T09:28:40.210681Z",
+     "shell.execute_reply": "2024-09-24T09:28:40.210115Z"
     }
    },
    "outputs": [
@@ -354,10 +354,10 @@
    "execution_count": 7,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:28.958743Z",
-     "iopub.status.busy": "2024-09-24T09:24:28.954541Z",
-     "iopub.status.idle": "2024-09-24T09:24:32.309281Z",
-     "shell.execute_reply": "2024-09-24T09:24:32.308528Z"
+     "iopub.execute_input": "2024-09-24T09:28:40.216136Z",
+     "iopub.status.busy": "2024-09-24T09:28:40.213491Z",
+     "iopub.status.idle": "2024-09-24T09:28:41.747091Z",
+     "shell.execute_reply": "2024-09-24T09:28:41.746287Z"
     }
    },
    "outputs": [
@@ -401,10 +401,10 @@
    "execution_count": 8,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:32.312456Z",
-     "iopub.status.busy": "2024-09-24T09:24:32.311917Z",
-     "iopub.status.idle": "2024-09-24T09:24:32.321621Z",
-     "shell.execute_reply": "2024-09-24T09:24:32.320996Z"
+     "iopub.execute_input": "2024-09-24T09:28:41.750936Z",
+     "iopub.status.busy": "2024-09-24T09:28:41.750452Z",
+     "iopub.status.idle": "2024-09-24T09:28:41.761613Z",
+     "shell.execute_reply": "2024-09-24T09:28:41.760908Z"
     }
    },
    "outputs": [
@@ -451,10 +451,10 @@
    "execution_count": 9,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:32.324968Z",
-     "iopub.status.busy": "2024-09-24T09:24:32.324452Z",
-     "iopub.status.idle": "2024-09-24T09:24:32.383931Z",
-     "shell.execute_reply": "2024-09-24T09:24:32.383228Z"
+     "iopub.execute_input": "2024-09-24T09:28:41.765418Z",
+     "iopub.status.busy": "2024-09-24T09:28:41.765110Z",
+     "iopub.status.idle": "2024-09-24T09:28:41.821891Z",
+     "shell.execute_reply": "2024-09-24T09:28:41.821012Z"
     }
    },
    "outputs": [
@@ -468,7 +468,7 @@
       "No. Factors:                          4   J-statistic:                    36.929\n",
       "No. Observations:                   819   P-value                         0.0000\n",
       "Date:                  Tue, Sep 24 2024   Distribution:                  chi2(5)\n",
-      "Time:                          09:24:32                                         \n",
+      "Time:                          09:28:41                                         \n",
       "Cov. Estimator:                  robust                                         \n",
       "                                                                                \n",
       "                            Risk Premia Estimates                             \n",
@@ -504,10 +504,10 @@
    "execution_count": 10,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:32.389935Z",
-     "iopub.status.busy": "2024-09-24T09:24:32.389647Z",
-     "iopub.status.idle": "2024-09-24T09:24:32.400401Z",
-     "shell.execute_reply": "2024-09-24T09:24:32.399767Z"
+     "iopub.execute_input": "2024-09-24T09:28:41.827649Z",
+     "iopub.status.busy": "2024-09-24T09:28:41.827302Z",
+     "iopub.status.idle": "2024-09-24T09:28:41.841682Z",
+     "shell.execute_reply": "2024-09-24T09:28:41.841064Z"
     }
    },
    "outputs": [
@@ -544,10 +544,10 @@
    "execution_count": 11,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:32.405098Z",
-     "iopub.status.busy": "2024-09-24T09:24:32.404820Z",
-     "iopub.status.idle": "2024-09-24T09:24:32.417356Z",
-     "shell.execute_reply": "2024-09-24T09:24:32.416729Z"
+     "iopub.execute_input": "2024-09-24T09:28:41.846793Z",
+     "iopub.status.busy": "2024-09-24T09:28:41.846508Z",
+     "iopub.status.idle": "2024-09-24T09:28:41.861337Z",
+     "shell.execute_reply": "2024-09-24T09:28:41.858045Z"
     }
    },
    "outputs": [
@@ -579,10 +579,10 @@
    "execution_count": 12,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:32.423098Z",
-     "iopub.status.busy": "2024-09-24T09:24:32.420821Z",
-     "iopub.status.idle": "2024-09-24T09:24:32.491406Z",
-     "shell.execute_reply": "2024-09-24T09:24:32.490536Z"
+     "iopub.execute_input": "2024-09-24T09:28:41.864531Z",
+     "iopub.status.busy": "2024-09-24T09:28:41.864277Z",
+     "iopub.status.idle": "2024-09-24T09:28:41.936706Z",
+     "shell.execute_reply": "2024-09-24T09:28:41.935882Z"
     }
    },
    "outputs": [
@@ -596,7 +596,7 @@
       "No. Factors:                          3   J-statistic:                    36.406\n",
       "No. Observations:                   819   P-value                         0.0000\n",
       "Date:                  Tue, Sep 24 2024   Distribution:                  chi2(6)\n",
-      "Time:                          09:24:32                                         \n",
+      "Time:                          09:28:41                                         \n",
       "Cov. Estimator:                  robust                                         \n",
       "                                                                                \n",
       "                            Risk Premia Estimates                             \n",
@@ -639,10 +639,10 @@
    "execution_count": 13,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:32.494092Z",
-     "iopub.status.busy": "2024-09-24T09:24:32.493816Z",
-     "iopub.status.idle": "2024-09-24T09:24:32.567201Z",
-     "shell.execute_reply": "2024-09-24T09:24:32.563804Z"
+     "iopub.execute_input": "2024-09-24T09:28:41.942101Z",
+     "iopub.status.busy": "2024-09-24T09:28:41.941782Z",
+     "iopub.status.idle": "2024-09-24T09:28:42.000327Z",
+     "shell.execute_reply": "2024-09-24T09:28:41.999568Z"
     }
    },
    "outputs": [
@@ -656,7 +656,7 @@
       "No. Factors:                          3   J-statistic:                    36.003\n",
       "No. Observations:                   819   P-value                         0.0000\n",
       "Date:                  Tue, Sep 24 2024   Distribution:                  chi2(5)\n",
-      "Time:                          09:24:32                                         \n",
+      "Time:                          09:28:41                                         \n",
       "Cov. Estimator:                  robust                                         \n",
       "                                                                                \n",
       "                            Risk Premia Estimates                             \n",
@@ -700,10 +700,10 @@
    "execution_count": 14,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:32.573800Z",
-     "iopub.status.busy": "2024-09-24T09:24:32.573501Z",
-     "iopub.status.idle": "2024-09-24T09:24:32.679820Z",
-     "shell.execute_reply": "2024-09-24T09:24:32.679032Z"
+     "iopub.execute_input": "2024-09-24T09:28:42.006146Z",
+     "iopub.status.busy": "2024-09-24T09:28:42.003095Z",
+     "iopub.status.idle": "2024-09-24T09:28:42.407013Z",
+     "shell.execute_reply": "2024-09-24T09:28:42.405664Z"
     }
    },
    "outputs": [
@@ -717,7 +717,7 @@
       "No. Factors:                          3   J-statistic:                    25.841\n",
       "No. Observations:                   819   P-value                         0.0002\n",
       "Date:                  Tue, Sep 24 2024   Distribution:                  chi2(6)\n",
-      "Time:                          09:24:32                                         \n",
+      "Time:                          09:28:42                                         \n",
       "Cov. Estimator:                  kernel                                         \n",
       "                                                                                \n",
       "                            Risk Premia Estimates                             \n",
@@ -761,10 +761,10 @@
    "execution_count": 15,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:32.688614Z",
-     "iopub.status.busy": "2024-09-24T09:24:32.688160Z",
-     "iopub.status.idle": "2024-09-24T09:24:35.156739Z",
-     "shell.execute_reply": "2024-09-24T09:24:35.156105Z"
+     "iopub.execute_input": "2024-09-24T09:28:42.412136Z",
+     "iopub.status.busy": "2024-09-24T09:28:42.411830Z",
+     "iopub.status.idle": "2024-09-24T09:28:44.587362Z",
+     "shell.execute_reply": "2024-09-24T09:28:44.584894Z"
     }
    },
    "outputs": [
@@ -851,7 +851,7 @@
       "No. Factors:                          3   J-statistic:                    22.067\n",
       "No. Observations:                   819   P-value                         0.0012\n",
       "Date:                  Tue, Sep 24 2024   Distribution:                  chi2(6)\n",
-      "Time:                          09:24:35                                         \n",
+      "Time:                          09:28:44                                         \n",
       "Cov. Estimator:                  robust                                         \n",
       "                                                                                \n",
       "                            Risk Premia Estimates                             \n",
@@ -899,10 +899,10 @@
    "execution_count": 16,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:35.162849Z",
-     "iopub.status.busy": "2024-09-24T09:24:35.162589Z",
-     "iopub.status.idle": "2024-09-24T09:24:39.012736Z",
-     "shell.execute_reply": "2024-09-24T09:24:39.011955Z"
+     "iopub.execute_input": "2024-09-24T09:28:44.593135Z",
+     "iopub.status.busy": "2024-09-24T09:28:44.589931Z",
+     "iopub.status.idle": "2024-09-24T09:28:49.094683Z",
+     "shell.execute_reply": "2024-09-24T09:28:49.093875Z"
     }
    },
    "outputs": [
@@ -916,7 +916,7 @@
       "No. Factors:                          3   J-statistic:                    13.833\n",
       "No. Observations:                   819   P-value                         0.0316\n",
       "Date:                  Tue, Sep 24 2024   Distribution:                  chi2(6)\n",
-      "Time:                          09:24:39                                         \n",
+      "Time:                          09:28:49                                         \n",
       "Cov. Estimator:                  kernel                                         \n",
       "                                                                                \n",
       "                            Risk Premia Estimates                             \n",
@@ -955,10 +955,10 @@
    "execution_count": 17,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:39.015755Z",
-     "iopub.status.busy": "2024-09-24T09:24:39.015279Z",
-     "iopub.status.idle": "2024-09-24T09:24:44.210186Z",
-     "shell.execute_reply": "2024-09-24T09:24:44.205108Z"
+     "iopub.execute_input": "2024-09-24T09:28:49.097926Z",
+     "iopub.status.busy": "2024-09-24T09:28:49.097480Z",
+     "iopub.status.idle": "2024-09-24T09:28:54.281442Z",
+     "shell.execute_reply": "2024-09-24T09:28:54.279661Z"
     }
    },
    "outputs": [
@@ -1099,7 +1099,7 @@
       "No. Factors:                          3   J-statistic:                    22.089\n",
       "No. Observations:                   819   P-value                         0.0012\n",
       "Date:                  Tue, Sep 24 2024   Distribution:                  chi2(6)\n",
-      "Time:                          09:24:44                                         \n",
+      "Time:                          09:28:54                                         \n",
       "Cov. Estimator:                  robust                                         \n",
       "                                                                                \n",
       "                            Risk Premia Estimates                             \n",
@@ -1146,10 +1146,10 @@
    "execution_count": 18,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:44.212926Z",
-     "iopub.status.busy": "2024-09-24T09:24:44.212649Z",
-     "iopub.status.idle": "2024-09-24T09:24:54.417863Z",
-     "shell.execute_reply": "2024-09-24T09:24:54.417052Z"
+     "iopub.execute_input": "2024-09-24T09:28:54.285089Z",
+     "iopub.status.busy": "2024-09-24T09:28:54.284773Z",
+     "iopub.status.idle": "2024-09-24T09:29:06.517195Z",
+     "shell.execute_reply": "2024-09-24T09:29:06.514061Z"
     }
    },
    "outputs": [
@@ -1157,7 +1157,13 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "Iteration: 0, Objective: 47.7579158282351\n",
+      "Iteration: 0, Objective: 47.7579158282351\n"
+     ]
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
       "Iteration: 10, Objective: 28.10258618881301\n"
      ]
     },
@@ -1165,7 +1171,13 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "Iteration: 20, Objective: 26.36138406887324\n",
+      "Iteration: 20, Objective: 26.36138406887324\n"
+     ]
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
       "Iteration: 30, Objective: 26.019665546492007\n"
      ]
     },
@@ -1236,7 +1248,7 @@
       "No. Factors:                          3   J-statistic:                    22.719\n",
       "No. Observations:                   819   P-value                         0.0009\n",
       "Date:                  Tue, Sep 24 2024   Distribution:                  chi2(6)\n",
-      "Time:                          09:24:54                                         \n",
+      "Time:                          09:29:06                                         \n",
       "Cov. Estimator:                  robust                                         \n",
       "                                                                                \n",
       "                            Risk Premia Estimates                             \n",
diff --git a/devel/asset-pricing/examples/formulas.html b/devel/asset-pricing/examples/formulas.html
index f1c6c8e8ef..7f77b0a2fe 100644
--- a/devel/asset-pricing/examples/formulas.html
+++ b/devel/asset-pricing/examples/formulas.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Using Formulas - linearmodels v6.1 (+13)</title>
+        <title>Using Formulas - linearmodels v6.1 (+15)</title>
       
     
 
@@ -94,7 +94,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -104,7 +104,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -191,10 +191,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
@@ -773,7 +773,7 @@ <h2 id="First-Syntax">First Syntax<a class="headerlink" href="#First-Syntax" tit
 No. Factors:                          3   J-statistic:                    9.9450
 No. Observations:                   819   P-value                         0.0190
 Date:                  Tue, Sep 24 2024   Distribution:                  chi2(3)
-Time:                          09:25:00
+Time:                          09:29:12
 Cov. Estimator:                  kernel
 
                             Risk Premia Estimates
@@ -819,7 +819,7 @@ <h2 id="Second-Syntax">Second Syntax<a class="headerlink" href="#Second-Syntax"
 No. Factors:                          3   J-statistic:                    86.386
 No. Observations:                   819   P-value                         0.0000
 Date:                  Tue, Sep 24 2024   Distribution:                 chi2(14)
-Time:                          09:25:00
+Time:                          09:29:12
 Cov. Estimator:                  robust
 
                             Risk Premia Estimates
@@ -861,7 +861,7 @@ <h2 id="Comparing-results">Comparing results<a class="headerlink" href="#Compari
 No. Factors:                          3   J-statistic:                    86.386
 No. Observations:                   819   P-value                         0.0000
 Date:                  Tue, Sep 24 2024   Distribution:                 chi2(14)
-Time:                          09:25:00
+Time:                          09:29:12
 Cov. Estimator:                  robust
 
                             Risk Premia Estimates
diff --git a/devel/asset-pricing/examples/formulas.ipynb b/devel/asset-pricing/examples/formulas.ipynb
index 39399e761b..20d18e88c5 100644
--- a/devel/asset-pricing/examples/formulas.ipynb
+++ b/devel/asset-pricing/examples/formulas.ipynb
@@ -44,10 +44,10 @@
    "execution_count": 1,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:58.314493Z",
-     "iopub.status.busy": "2024-09-24T09:24:58.314221Z",
-     "iopub.status.idle": "2024-09-24T09:24:59.593951Z",
-     "shell.execute_reply": "2024-09-24T09:24:59.593038Z"
+     "iopub.execute_input": "2024-09-24T09:29:10.549380Z",
+     "iopub.status.busy": "2024-09-24T09:29:10.549148Z",
+     "iopub.status.idle": "2024-09-24T09:29:11.986596Z",
+     "shell.execute_reply": "2024-09-24T09:29:11.985707Z"
     }
    },
    "outputs": [
@@ -121,10 +121,10 @@
    "execution_count": 2,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:59.597236Z",
-     "iopub.status.busy": "2024-09-24T09:24:59.596706Z",
-     "iopub.status.idle": "2024-09-24T09:25:00.236458Z",
-     "shell.execute_reply": "2024-09-24T09:25:00.235796Z"
+     "iopub.execute_input": "2024-09-24T09:29:11.989481Z",
+     "iopub.status.busy": "2024-09-24T09:29:11.989179Z",
+     "iopub.status.idle": "2024-09-24T09:29:12.584241Z",
+     "shell.execute_reply": "2024-09-24T09:29:12.582662Z"
     }
    },
    "outputs": [
@@ -138,7 +138,7 @@
       "No. Factors:                          3   J-statistic:                    9.9450\n",
       "No. Observations:                   819   P-value                         0.0190\n",
       "Date:                  Tue, Sep 24 2024   Distribution:                  chi2(3)\n",
-      "Time:                          09:25:00                                         \n",
+      "Time:                          09:29:12                                         \n",
       "Cov. Estimator:                  kernel                                         \n",
       "                                                                                \n",
       "                            Risk Premia Estimates                             \n",
@@ -179,10 +179,10 @@
    "execution_count": 3,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:00.241871Z",
-     "iopub.status.busy": "2024-09-24T09:25:00.241643Z",
-     "iopub.status.idle": "2024-09-24T09:25:00.457384Z",
-     "shell.execute_reply": "2024-09-24T09:25:00.453719Z"
+     "iopub.execute_input": "2024-09-24T09:29:12.587857Z",
+     "iopub.status.busy": "2024-09-24T09:29:12.587420Z",
+     "iopub.status.idle": "2024-09-24T09:29:12.724601Z",
+     "shell.execute_reply": "2024-09-24T09:29:12.723825Z"
     }
    },
    "outputs": [
@@ -196,7 +196,7 @@
       "No. Factors:                          3   J-statistic:                    86.386\n",
       "No. Observations:                   819   P-value                         0.0000\n",
       "Date:                  Tue, Sep 24 2024   Distribution:                 chi2(14)\n",
-      "Time:                          09:25:00                                         \n",
+      "Time:                          09:29:12                                         \n",
       "Cov. Estimator:                  robust                                         \n",
       "                                                                                \n",
       "                            Risk Premia Estimates                             \n",
@@ -241,10 +241,10 @@
    "execution_count": 4,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:00.461065Z",
-     "iopub.status.busy": "2024-09-24T09:25:00.459652Z",
-     "iopub.status.idle": "2024-09-24T09:25:00.656320Z",
-     "shell.execute_reply": "2024-09-24T09:25:00.655663Z"
+     "iopub.execute_input": "2024-09-24T09:29:12.728538Z",
+     "iopub.status.busy": "2024-09-24T09:29:12.728090Z",
+     "iopub.status.idle": "2024-09-24T09:29:12.852322Z",
+     "shell.execute_reply": "2024-09-24T09:29:12.851649Z"
     }
    },
    "outputs": [
@@ -258,7 +258,7 @@
       "No. Factors:                          3   J-statistic:                    86.386\n",
       "No. Observations:                   819   P-value                         0.0000\n",
       "Date:                  Tue, Sep 24 2024   Distribution:                 chi2(14)\n",
-      "Time:                          09:25:00                                         \n",
+      "Time:                          09:29:12                                         \n",
       "Cov. Estimator:                  robust                                         \n",
       "                                                                                \n",
       "                            Risk Premia Estimates                             \n",
@@ -273,14 +273,7 @@
       "\n",
       "Covariance estimator:\n",
       "HeteroskedasticCovariance\n",
-      "See full_summary for complete results"
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "\n"
+      "See full_summary for complete results\n"
      ]
     }
    ],
diff --git a/devel/asset-pricing/index.html b/devel/asset-pricing/index.html
index 143bc970c0..b9cf372f80 100644
--- a/devel/asset-pricing/index.html
+++ b/devel/asset-pricing/index.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Linear Factor Models for Asset Pricing - linearmodels v6.1 (+13)</title>
+        <title>Linear Factor Models for Asset Pricing - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/asset-pricing/introduction.html b/devel/asset-pricing/introduction.html
index 6dc1ae1b56..bb4c2e33ff 100644
--- a/devel/asset-pricing/introduction.html
+++ b/devel/asset-pricing/introduction.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Introduction - linearmodels v6.1 (+13)</title>
+        <title>Introduction - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/asset-pricing/mathematical-formula.html b/devel/asset-pricing/mathematical-formula.html
index 3df7888eab..6dd678d80b 100644
--- a/devel/asset-pricing/mathematical-formula.html
+++ b/devel/asset-pricing/mathematical-formula.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Formulas and Mathematical Detail - linearmodels v6.1 (+13)</title>
+        <title>Formulas and Mathematical Detail - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/asset-pricing/reference.html b/devel/asset-pricing/reference.html
index 3c09566198..d5f3c39f97 100644
--- a/devel/asset-pricing/reference.html
+++ b/devel/asset-pricing/reference.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Module Reference - linearmodels v6.1 (+13)</title>
+        <title>Module Reference - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/changes.html b/devel/changes.html
index d2db4ab9ec..a28c64c366 100644
--- a/devel/changes.html
+++ b/devel/changes.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Change Log - linearmodels v6.1 (+13)</title>
+        <title>Change Log - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="_static/bw-logo.svg" alt="logo">
     </a>
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@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         </div>
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@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
@@ -404,7 +404,7 @@
       
         
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-          <a href="#version-6-0"><span title="/changes.rst#version-6-0 (reference label)" class="md-ellipsis">Version 6.<wbr>0</span></a>
+          <a href="#id1"><span title="/changes.rst#id1 (reference label)" class="md-ellipsis">Version 6.<wbr>0</span></a>
           
             <label for="__nav_10_1">
               <span class="md-nav__icon md-icon"></span>
@@ -415,7 +415,7 @@
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         <label class="md-nav__title" for="__nav_10_1">
           <span class="md-nav__icon md-icon"></span>
-          <span title="/changes.rst#version-6-0 (reference label)" class="md-ellipsis">Version 6.<wbr>0</span>
+          <span title="/changes.rst#id1 (reference label)" class="md-ellipsis">Version 6.<wbr>0</span>
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@@ -656,6 +656,13 @@
     <span title="/changes.rst#version-6-0 (reference label)" class="md-ellipsis">Version 6.<wbr>0</span>
   </a>
   
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#id1" class="md-nav__link">
+    <span title="/changes.rst#id1 (reference label)" class="md-ellipsis">Version 6.<wbr>0</span>
+  </a>
+  
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@@ -801,6 +808,13 @@
     <span title="/changes.rst#version-6-0 (reference label)" class="md-ellipsis">Version 6.<wbr>0</span>
   </a>
   
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#id1" class="md-nav__link">
+    <span title="/changes.rst#id1 (reference label)" class="md-ellipsis">Version 6.<wbr>0</span>
+  </a>
+  
     <nav class="md-nav" aria-label="Version 6.0">
       <ul class="md-nav__list">
         
@@ -833,6 +847,12 @@
 <h1 id="change-log">Change Log<a class="headerlink" href="#change-log" title="Link to this heading">¶</a></h1>
 <h2 id="version-6-0">Version 6.0<a class="headerlink" href="#version-6-0" title="Link to this heading">¶</a></h2>
 <ul class="simple">
+<li><p>Fixes for the removal of the <code class="docutils literal notranslate"><span class="pre">.A</span></code> shorthand for <code class="docutils literal notranslate"><span class="pre">.toarray()</span></code> for sparse arrays</p></li>
+<li><p>Small doc fixes</p></li>
+<li><p>Support Python 3.13</p></li>
+</ul>
+<h2 id="id1">Version 6.0<a class="headerlink" href="#id1" title="Link to this heading">¶</a></h2>
+<ul class="simple">
 <li><p>Increased minimums:</p>
 <ul>
 <li><p>Python: 3.9</p></li>
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index 070e2bb83d..9dc5a56787 100644
--- a/devel/changes/3.0-2.0-1.0.html
+++ b/devel/changes/3.0-2.0-1.0.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Version 3.0 - linearmodels v6.1 (+13)</title>
+        <title>Version 3.0 - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -185,10 +185,10 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
@@ -400,7 +400,7 @@
       
         
         <div class="md-nav__link md-nav__link--index ">
-          <a href="../changes.html#version-6-0"><span title="/changes.rst#version-6-0 (reference label)" class="md-ellipsis">Version 6.<wbr>0</span></a>
+          <a href="../changes.html#id1"><span title="/changes.rst#id1 (reference label)" class="md-ellipsis">Version 6.<wbr>0</span></a>
           
             <label for="__nav_10_1">
               <span class="md-nav__icon md-icon"></span>
@@ -411,7 +411,7 @@
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         <label class="md-nav__title" for="__nav_10_1">
           <span class="md-nav__icon md-icon"></span>
-          <span title="/changes.rst#version-6-0 (reference label)" class="md-ellipsis">Version 6.<wbr>0</span>
+          <span title="/changes.rst#id1 (reference label)" class="md-ellipsis">Version 6.<wbr>0</span>
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diff --git a/devel/changes/4.0.html b/devel/changes/4.0.html
index ef5ec767f5..041a5875c2 100644
--- a/devel/changes/4.0.html
+++ b/devel/changes/4.0.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Version 4 - linearmodels v6.1 (+13)</title>
+        <title>Version 4 - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
@@ -405,7 +405,7 @@
       
         
         <div class="md-nav__link md-nav__link--index ">
-          <a href="../changes.html#version-6-0"><span title="/changes.rst#version-6-0 (reference label)" class="md-ellipsis">Version 6.<wbr>0</span></a>
+          <a href="../changes.html#id1"><span title="/changes.rst#id1 (reference label)" class="md-ellipsis">Version 6.<wbr>0</span></a>
           
             <label for="__nav_10_1">
               <span class="md-nav__icon md-icon"></span>
@@ -416,7 +416,7 @@
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         <label class="md-nav__title" for="__nav_10_1">
           <span class="md-nav__icon md-icon"></span>
-          <span title="/changes.rst#version-6-0 (reference label)" class="md-ellipsis">Version 6.<wbr>0</span>
+          <span title="/changes.rst#id1 (reference label)" class="md-ellipsis">Version 6.<wbr>0</span>
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         <ul class="md-nav__list" data-md-scrollfix>
           
diff --git a/devel/changes/5.0.html b/devel/changes/5.0.html
index cb492cc8ea..2b7b0648fb 100644
--- a/devel/changes/5.0.html
+++ b/devel/changes/5.0.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Verison 5.5 - linearmodels v6.1 (+13)</title>
+        <title>Verison 5.5 - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
@@ -400,7 +400,7 @@
       
         
         <div class="md-nav__link md-nav__link--index ">
-          <a href="../changes.html#version-6-0"><span title="/changes.rst#version-6-0 (reference label)" class="md-ellipsis">Version 6.<wbr>0</span></a>
+          <a href="../changes.html#id1"><span title="/changes.rst#id1 (reference label)" class="md-ellipsis">Version 6.<wbr>0</span></a>
           
             <label for="__nav_10_1">
               <span class="md-nav__icon md-icon"></span>
@@ -411,7 +411,7 @@
       <nav class="md-nav" aria-label="Version 6.0" data-md-level="2">
         <label class="md-nav__title" for="__nav_10_1">
           <span class="md-nav__icon md-icon"></span>
-          <span title="/changes.rst#version-6-0 (reference label)" class="md-ellipsis">Version 6.<wbr>0</span>
+          <span title="/changes.rst#id1 (reference label)" class="md-ellipsis">Version 6.<wbr>0</span>
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         <ul class="md-nav__list" data-md-scrollfix>
           
diff --git a/devel/changes/6.0.html b/devel/changes/6.0.html
index 6cd1bef237..519ea2a8d5 100644
--- a/devel/changes/6.0.html
+++ b/devel/changes/6.0.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Version 6.0 - linearmodels v6.1 (+13)</title>
+        <title>Version 6.0 - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
@@ -414,6 +414,12 @@
 
 <h1 id="version-6-0">Version 6.0<a class="headerlink" href="#version-6-0" title="Link to this heading">¶</a></h1>
 <ul class="simple">
+<li><p>Fixes for the removal of the <code class="docutils literal notranslate"><span class="pre">.A</span></code> shorthand for <code class="docutils literal notranslate"><span class="pre">.toarray()</span></code> for sparse arrays</p></li>
+<li><p>Small doc fixes</p></li>
+<li><p>Support Python 3.13</p></li>
+</ul>
+<h1 id="id1">Version 6.0<a class="headerlink" href="#id1" title="Link to this heading">¶</a></h1>
+<ul class="simple">
 <li><p>Increased minimums:</p>
 <ul>
 <li><p>Python: 3.9</p></li>
diff --git a/devel/compatibility.html b/devel/compatibility.html
index c0ede82c75..f85f61e666 100644
--- a/devel/compatibility.html
+++ b/devel/compatibility.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Compatibility - linearmodels v6.1 (+13)</title>
+        <title>Compatibility - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/compatibility/linearmodels.compat.statsmodels.Summary.add_extra_txt.html b/devel/compatibility/linearmodels.compat.statsmodels.Summary.add_extra_txt.html
index 61b25a6b61..d172cf7235 100644
--- a/devel/compatibility/linearmodels.compat.statsmodels.Summary.add_extra_txt.html
+++ b/devel/compatibility/linearmodels.compat.statsmodels.Summary.add_extra_txt.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.compat.statsmodels.Summary.add_extra_txt - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.compat.statsmodels.Summary.add_extra_txt - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/compatibility/linearmodels.compat.statsmodels.Summary.add_table_2cols.html b/devel/compatibility/linearmodels.compat.statsmodels.Summary.add_table_2cols.html
index a6402cb82a..2d543e9bdf 100644
--- a/devel/compatibility/linearmodels.compat.statsmodels.Summary.add_table_2cols.html
+++ b/devel/compatibility/linearmodels.compat.statsmodels.Summary.add_table_2cols.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.compat.statsmodels.Summary.add_table_2cols - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.compat.statsmodels.Summary.add_table_2cols - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/compatibility/linearmodels.compat.statsmodels.Summary.add_table_params.html b/devel/compatibility/linearmodels.compat.statsmodels.Summary.add_table_params.html
index dc6dbd5527..1cb8416c2b 100644
--- a/devel/compatibility/linearmodels.compat.statsmodels.Summary.add_table_params.html
+++ b/devel/compatibility/linearmodels.compat.statsmodels.Summary.add_table_params.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.compat.statsmodels.Summary.add_table_params - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.compat.statsmodels.Summary.add_table_params - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/compatibility/linearmodels.compat.statsmodels.Summary.as_csv.html b/devel/compatibility/linearmodels.compat.statsmodels.Summary.as_csv.html
index d3b3f1dded..fa3ba6cbac 100644
--- a/devel/compatibility/linearmodels.compat.statsmodels.Summary.as_csv.html
+++ b/devel/compatibility/linearmodels.compat.statsmodels.Summary.as_csv.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.compat.statsmodels.Summary.as_csv - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.compat.statsmodels.Summary.as_csv - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/compatibility/linearmodels.compat.statsmodels.Summary.as_html.html b/devel/compatibility/linearmodels.compat.statsmodels.Summary.as_html.html
index 7eed205b5d..7a13d1d332 100644
--- a/devel/compatibility/linearmodels.compat.statsmodels.Summary.as_html.html
+++ b/devel/compatibility/linearmodels.compat.statsmodels.Summary.as_html.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.compat.statsmodels.Summary.as_html - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.compat.statsmodels.Summary.as_html - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/compatibility/linearmodels.compat.statsmodels.Summary.as_latex.html b/devel/compatibility/linearmodels.compat.statsmodels.Summary.as_latex.html
index dec7596e35..43214bc2a4 100644
--- a/devel/compatibility/linearmodels.compat.statsmodels.Summary.as_latex.html
+++ b/devel/compatibility/linearmodels.compat.statsmodels.Summary.as_latex.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.compat.statsmodels.Summary.as_latex - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.compat.statsmodels.Summary.as_latex - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/compatibility/linearmodels.compat.statsmodels.Summary.as_text.html b/devel/compatibility/linearmodels.compat.statsmodels.Summary.as_text.html
index e5353037c2..0d90993f88 100644
--- a/devel/compatibility/linearmodels.compat.statsmodels.Summary.as_text.html
+++ b/devel/compatibility/linearmodels.compat.statsmodels.Summary.as_text.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.compat.statsmodels.Summary.as_text - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.compat.statsmodels.Summary.as_text - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/compatibility/linearmodels.compat.statsmodels.Summary.html b/devel/compatibility/linearmodels.compat.statsmodels.Summary.html
index 440b0a3c44..9cac537922 100644
--- a/devel/compatibility/linearmodels.compat.statsmodels.Summary.html
+++ b/devel/compatibility/linearmodels.compat.statsmodels.Summary.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.compat.statsmodels.Summary - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.compat.statsmodels.Summary - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/contributing.html b/devel/contributing.html
index 3741661d03..3c92cfba88 100644
--- a/devel/contributing.html
+++ b/devel/contributing.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Contributing - linearmodels v6.1 (+13)</title>
+        <title>Contributing - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/genindex.html b/devel/genindex.html
index bcdef2fb05..895dadc787 100644
--- a/devel/genindex.html
+++ b/devel/genindex.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>None - linearmodels v6.1 (+13)</title>
+        <title>None - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/index.html b/devel/index.html
index 94ea59c585..d967e2e564 100644
--- a/devel/index.html
+++ b/devel/index.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels v6.1 (+13)</title>
+        <title>linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="#" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="#" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -197,10 +197,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="#" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="#" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLS.absorbed_dependent.html b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLS.absorbed_dependent.html
index 96e352d8c3..3f92048204 100644
--- a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLS.absorbed_dependent.html
+++ b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLS.absorbed_dependent.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.AbsorbingLS.absorbed_dependent - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.AbsorbingLS.absorbed_dependent - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLS.absorbed_exog.html b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLS.absorbed_exog.html
index d875575127..89085db999 100644
--- a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLS.absorbed_exog.html
+++ b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLS.absorbed_exog.html
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@@ -103,7 +103,7 @@
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+    linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.absorbed_effects - linearmodels v6.1 (+15)</title>
       
     
 
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+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.absorbed_rsquared - linearmodels v6.1 (+15)</title>
       
     
 
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@@ -103,7 +103,7 @@
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+            linearmodels v6.1 (+15)
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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--- a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.conf_int.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.AbsorbingLSResults.conf_int - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.conf_int - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.cov.html b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.cov.html
index eec0504d92..240663ddf5 100644
--- a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.cov.html
+++ b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.cov.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.AbsorbingLSResults.cov - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.cov - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.cov_config - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.cov_estimator.html b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.cov_estimator.html
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.cov_estimator - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.cov_type - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
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--- a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.debiased.html
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.df_absorbed.html b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.df_absorbed.html
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.df_absorbed - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.df_model.html b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.df_model.html
index 196f720eca..236b4304a3 100644
--- a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.df_model.html
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.df_model - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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index 93894e9d3c..4078a62dc2 100644
--- a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.df_resid.html
+++ b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.df_resid.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.AbsorbingLSResults.df_resid - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.df_resid - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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+++ b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.f_statistic.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.AbsorbingLSResults.f_statistic - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.f_statistic - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.fitted_values.html b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.fitted_values.html
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--- a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.fitted_values.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.AbsorbingLSResults.fitted_values - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.fitted_values - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.has_constant.html b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.has_constant.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.AbsorbingLSResults.has_constant - linearmodels v6.1 (+13)</title>
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@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.html b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.html
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--- a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.AbsorbingLSResults - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.AbsorbingLSResults - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.idiosyncratic.html b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.idiosyncratic.html
index a278999e26..0f2883548a 100644
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.AbsorbingLSResults.idiosyncratic - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.idiosyncratic - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.method.html b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.method.html
index 763184899c..04e1ac44de 100644
--- a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.method.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.AbsorbingLSResults.method - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.method - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.model_ss.html b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.model_ss.html
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+++ b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.model_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.AbsorbingLSResults.model_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.model_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.params.html b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.params.html
index 3d7ee94daf..98ae08c523 100644
--- a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.params.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.AbsorbingLSResults.params - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.params - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.pvalues.html b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.pvalues.html
index c542e96ad7..7969ae8b3d 100644
--- a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.pvalues.html
+++ b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.pvalues.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.AbsorbingLSResults.pvalues - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.pvalues - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.resid_ss.html b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.resid_ss.html
index 08a85053d7..7f2dfbb19d 100644
--- a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.resid_ss.html
+++ b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.resid_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.AbsorbingLSResults.resid_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.resid_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.resids.html b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.resids.html
index 163688094a..836605ff0e 100644
--- a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.resids.html
+++ b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.resids.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.AbsorbingLSResults.resids - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.resids - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.rsquared.html b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.rsquared.html
index f91609d5c5..a0f11eb029 100644
--- a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.rsquared.html
+++ b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.rsquared.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.AbsorbingLSResults.rsquared - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.rsquared - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.rsquared_adj.html b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.rsquared_adj.html
index f9c9d8a832..7653c14e71 100644
--- a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.rsquared_adj.html
+++ b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.rsquared_adj.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.AbsorbingLSResults.rsquared_adj - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.rsquared_adj - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.s2.html b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.s2.html
index 642cdc8268..124f841d5b 100644
--- a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.s2.html
+++ b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.s2.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.AbsorbingLSResults.s2 - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.s2 - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.std_errors.html b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.std_errors.html
index 8ea1470d35..6838019705 100644
--- a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.std_errors.html
+++ b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.std_errors.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.AbsorbingLSResults.std_errors - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.std_errors - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.summary.html b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.summary.html
index a7981ea490..dc8e08ef2c 100644
--- a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.summary.html
+++ b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.summary.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.AbsorbingLSResults.summary - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.summary - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.total_ss.html b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.total_ss.html
index 8e619bd38b..6942398b6d 100644
--- a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.total_ss.html
+++ b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.total_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.AbsorbingLSResults.total_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.total_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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--- a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingLSResults.tstats.html
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.absorbing.AbsorbingLSResults.tstats - linearmodels v6.1 (+15)</title>
       
     
 
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+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+            linearmodels v6.1 (+15)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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+            linearmodels v6.1 (+15)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+            linearmodels v6.1 (+15)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingRegressor.html b/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingRegressor.html
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--- a/devel/iv/absorbing/linearmodels.iv.absorbing.AbsorbingRegressor.html
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.absorbing.AbsorbingRegressor - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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index 492fd2a0b7..b73270034c 100644
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.absorbing.AbsorbingRegressor.regressors - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.cat.html b/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.cat.html
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.cont.html b/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.cont.html
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.drop.html b/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.drop.html
index fb63e3081a..de49209f20 100644
--- a/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.drop.html
+++ b/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.drop.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.Interaction.drop - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.Interaction.drop - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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@@ -103,7 +103,7 @@
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+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.from_frame.html b/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.from_frame.html
index 3447bd8e6f..c90e5cae39 100644
--- a/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.from_frame.html
+++ b/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.from_frame.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.Interaction.from_frame - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.Interaction.from_frame - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.hash.html b/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.hash.html
index d6d94f1d6f..1872270025 100644
--- a/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.hash.html
+++ b/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.hash.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.Interaction.hash - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.Interaction.hash - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.html b/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.html
index 95c9307a7f..45cc1d6c4f 100644
--- a/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.html
+++ b/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.Interaction - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.Interaction - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.isnull.html b/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.isnull.html
index 736da20442..853c00cb15 100644
--- a/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.isnull.html
+++ b/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.isnull.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.Interaction.isnull - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.Interaction.isnull - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.nobs.html b/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.nobs.html
index 9197f8728a..3db51bfa95 100644
--- a/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.nobs.html
+++ b/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.nobs.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.Interaction.nobs - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.Interaction.nobs - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.sparse.html b/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.sparse.html
index d6a72e7377..e24b765f7c 100644
--- a/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.sparse.html
+++ b/devel/iv/absorbing/linearmodels.iv.absorbing.Interaction.sparse.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.absorbing.Interaction.sparse - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.absorbing.Interaction.sparse - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/examples/absorbing-regression.html b/devel/iv/examples/absorbing-regression.html
index 45ed8b701e..df7f05946d 100644
--- a/devel/iv/examples/absorbing-regression.html
+++ b/devel/iv/examples/absorbing-regression.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Absorbing Regression - linearmodels v6.1 (+13)</title>
+        <title>Absorbing Regression - linearmodels v6.1 (+15)</title>
       
     
 
@@ -94,7 +94,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -104,7 +104,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
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+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -191,10 +191,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
@@ -687,7 +687,7 @@ <h2 id="Including-a-constant">Including a constant<a class="headerlink" href="#I
 Estimator:               Absorbing LS   Adj. R-squared:                     0.7975
 No. Observations:             1000000   F-statistic:                     1.962e+06
 Date:                Tue, Sep 24 2024   P-value (F-stat):                   0.0000
-Time:                        09:24:36   Distribution:                      chi2(2)
+Time:                        09:28:48   Distribution:                      chi2(2)
 Cov. Estimator:                robust   R-squared (No Effects):             0.6664
                                         Variables Absorbed:              1.987e+05
                              Parameter Estimates
@@ -724,7 +724,7 @@ <h2 id="Excluding-the-constant">Excluding the constant<a class="headerlink" href
 Estimator:               Absorbing LS   Adj. R-squared:                     0.7975
 No. Observations:             1000000   F-statistic:                     1.962e+06
 Date:                Tue, Sep 24 2024   P-value (F-stat):                   0.0000
-Time:                        09:24:44   Distribution:                      chi2(2)
+Time:                        09:28:56   Distribution:                      chi2(2)
 Cov. Estimator:                robust   R-squared (No Effects):             0.6664
                                         Variables Absorbed:              1.987e+05
                              Parameter Estimates
@@ -768,8 +768,8 @@ <h2 id="Optimization-Options">Optimization Options<a class="headerlink" href="#O
 </div>
 <div class="output_area docutils container">
 <div class="highlight"><pre>
-LSMR Second: 4.272482
-HDFE Second: 2.014733
+LSMR Second: 4.436325
+HDFE Second: 2.189924
 </pre></div></div>
 </div>
 <p>LSMR is iterative and does not have a closed form. The tolerance can be set using <code class="docutils literal notranslate"><span class="pre">absorb_options</span></code> which is a dictionary. See <a class="reference external" href="https://docs.scipy.org/doc/scipy-1.2.1/reference/generated/scipy.sparse.linalg.lsmr.html#scipy.sparse.linalg.lsmr">scipy.sparse.linalg.lsmr</a> for details on the options.</p>
diff --git a/devel/iv/examples/absorbing-regression.ipynb b/devel/iv/examples/absorbing-regression.ipynb
index 40af89f649..04db418a44 100644
--- a/devel/iv/examples/absorbing-regression.ipynb
+++ b/devel/iv/examples/absorbing-regression.ipynb
@@ -20,10 +20,10 @@
    "execution_count": 1,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:27.206537Z",
-     "iopub.status.busy": "2024-09-24T09:24:27.206230Z",
-     "iopub.status.idle": "2024-09-24T09:24:27.901732Z",
-     "shell.execute_reply": "2024-09-24T09:24:27.901023Z"
+     "iopub.execute_input": "2024-09-24T09:28:38.312882Z",
+     "iopub.status.busy": "2024-09-24T09:28:38.311817Z",
+     "iopub.status.idle": "2024-09-24T09:28:38.897223Z",
+     "shell.execute_reply": "2024-09-24T09:28:38.896444Z"
     }
    },
    "outputs": [],
@@ -62,10 +62,10 @@
    "execution_count": 2,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:27.904877Z",
-     "iopub.status.busy": "2024-09-24T09:24:27.904515Z",
-     "iopub.status.idle": "2024-09-24T09:24:36.936695Z",
-     "shell.execute_reply": "2024-09-24T09:24:36.935940Z"
+     "iopub.execute_input": "2024-09-24T09:28:38.900601Z",
+     "iopub.status.busy": "2024-09-24T09:28:38.900233Z",
+     "iopub.status.idle": "2024-09-24T09:28:48.892565Z",
+     "shell.execute_reply": "2024-09-24T09:28:48.891786Z"
     }
    },
    "outputs": [
@@ -79,7 +79,7 @@
       "Estimator:               Absorbing LS   Adj. R-squared:                     0.7975\n",
       "No. Observations:             1000000   F-statistic:                     1.962e+06\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat):                   0.0000\n",
-      "Time:                        09:24:36   Distribution:                      chi2(2)\n",
+      "Time:                        09:28:48   Distribution:                      chi2(2)\n",
       "Cov. Estimator:                robust   R-squared (No Effects):             0.6664\n",
       "                                        Variables Absorbed:              1.987e+05\n",
       "                             Parameter Estimates                              \n",
@@ -113,10 +113,10 @@
    "execution_count": 3,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:36.984683Z",
-     "iopub.status.busy": "2024-09-24T09:24:36.983948Z",
-     "iopub.status.idle": "2024-09-24T09:24:44.889746Z",
-     "shell.execute_reply": "2024-09-24T09:24:44.888934Z"
+     "iopub.execute_input": "2024-09-24T09:28:49.063229Z",
+     "iopub.status.busy": "2024-09-24T09:28:49.062657Z",
+     "iopub.status.idle": "2024-09-24T09:28:56.957350Z",
+     "shell.execute_reply": "2024-09-24T09:28:56.956628Z"
     }
    },
    "outputs": [
@@ -130,7 +130,7 @@
       "Estimator:               Absorbing LS   Adj. R-squared:                     0.7975\n",
       "No. Observations:             1000000   F-statistic:                     1.962e+06\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat):                   0.0000\n",
-      "Time:                        09:24:44   Distribution:                      chi2(2)\n",
+      "Time:                        09:28:56   Distribution:                      chi2(2)\n",
       "Cov. Estimator:                robust   R-squared (No Effects):             0.6664\n",
       "                                        Variables Absorbed:              1.987e+05\n",
       "                             Parameter Estimates                              \n",
@@ -169,10 +169,10 @@
    "execution_count": 4,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:44.895397Z",
-     "iopub.status.busy": "2024-09-24T09:24:44.895114Z",
-     "iopub.status.idle": "2024-09-24T09:24:53.159559Z",
-     "shell.execute_reply": "2024-09-24T09:24:53.158778Z"
+     "iopub.execute_input": "2024-09-24T09:28:56.964208Z",
+     "iopub.status.busy": "2024-09-24T09:28:56.963466Z",
+     "iopub.status.idle": "2024-09-24T09:29:05.767841Z",
+     "shell.execute_reply": "2024-09-24T09:29:05.767008Z"
     }
    },
    "outputs": [
@@ -180,14 +180,14 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "LSMR Second: 4.272482\n"
+      "LSMR Second: 4.436325\n"
      ]
     },
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "HDFE Second: 2.014733\n"
+      "HDFE Second: 2.189924\n"
      ]
     }
    ],
@@ -219,10 +219,10 @@
    "execution_count": 5,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:53.164486Z",
-     "iopub.status.busy": "2024-09-24T09:24:53.164242Z",
-     "iopub.status.idle": "2024-09-24T09:24:58.412921Z",
-     "shell.execute_reply": "2024-09-24T09:24:58.409555Z"
+     "iopub.execute_input": "2024-09-24T09:29:05.770733Z",
+     "iopub.status.busy": "2024-09-24T09:29:05.770477Z",
+     "iopub.status.idle": "2024-09-24T09:29:11.434515Z",
+     "shell.execute_reply": "2024-09-24T09:29:11.431289Z"
     }
    },
    "outputs": [
@@ -246,19 +246,31 @@
       "     1  1.83446e+02  1.677e+03  6.377e+02   6.9e-01  3.1e-01  1.2e+00  1.0e+00\n",
       "     2  2.09819e+02  1.563e+03  1.668e+02   6.5e-01  6.2e-02  1.7e+00  1.2e+00\n",
       "     3  2.17247e+02  1.553e+03  6.446e+01   6.4e-01  2.1e-02  2.0e+00  1.3e+00\n",
-      "     4  2.30067e+02  1.551e+03  6.539e-01   6.4e-01  1.9e-04  2.2e+00  1.5e+00\n",
-      "     5  2.30071e+02  1.551e+03  2.662e-01   6.4e-01  7.0e-05  2.4e+00  1.5e+00\n",
-      "     6  2.29984e+02  1.551e+03  4.542e-03   6.4e-01  1.1e-06  2.6e+00  1.6e+00\n"
+      "     4  2.30067e+02  1.551e+03  6.539e-01   6.4e-01  1.9e-04  2.2e+00  1.5e+00\n"
      ]
     },
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
+      "     5  2.30071e+02  1.551e+03  2.662e-01   6.4e-01  7.0e-05  2.4e+00  1.5e+00\n",
+      "     6  2.29984e+02  1.551e+03  4.542e-03   6.4e-01  1.1e-06  2.6e+00  1.6e+00\n",
       "     7  2.29984e+02  1.551e+03  3.999e-03   6.4e-01  9.6e-07  2.7e+00  2.5e+00\n",
-      "     8  2.29985e+02  1.551e+03  3.882e-03   6.4e-01  8.7e-07  2.9e+00  6.5e+00\n",
+      "     8  2.29985e+02  1.551e+03  3.882e-03   6.4e-01  8.7e-07  2.9e+00  6.5e+00\n"
+     ]
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
       "     9  2.29985e+02  1.551e+03  3.882e-03   6.4e-01  8.3e-07  3.0e+00  5.1e+02\n",
-      "    10  2.29990e+02  1.551e+03  3.882e-03   6.4e-01  7.8e-07  3.2e+00  5.5e+02\n",
+      "    10  2.29990e+02  1.551e+03  3.882e-03   6.4e-01  7.8e-07  3.2e+00  5.5e+02\n"
+     ]
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
       "    13  3.86056e+02  1.551e+03  4.003e-05   6.4e-01  7.2e-09  3.6e+00  8.7e+01\n",
       " \n",
       "LSMR finished\n",
@@ -293,15 +305,15 @@
       "     3  2.41447e-01  8.953e+02  6.412e-01   8.9e-01  4.0e-04  1.8e+00  1.4e+00\n",
       "     4  2.88004e-01  8.953e+02  6.266e-03   8.9e-01  3.1e-06  2.2e+00  1.3e+00\n",
       "     5  2.87319e-01  8.953e+02  2.921e-03   8.9e-01  1.4e-06  2.4e+00  1.4e+00\n",
-      "     6  2.87000e-01  8.953e+02  9.868e-04   8.9e-01  4.2e-07  2.6e+00  1.4e+00\n",
-      "     7  2.87108e-01  8.953e+02  9.866e-04   8.9e-01  4.2e-07  2.6e+00  6.2e+01\n",
-      "     8  2.87255e-01  8.953e+02  9.866e-04   8.9e-01  3.9e-07  2.9e+00  1.3e+02\n"
+      "     6  2.87000e-01  8.953e+02  9.868e-04   8.9e-01  4.2e-07  2.6e+00  1.4e+00\n"
      ]
     },
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
+      "     7  2.87108e-01  8.953e+02  9.866e-04   8.9e-01  4.2e-07  2.6e+00  6.2e+01\n",
+      "     8  2.87255e-01  8.953e+02  9.866e-04   8.9e-01  3.9e-07  2.9e+00  1.3e+02\n",
       "     9  3.62098e-01  8.953e+02  9.857e-04   8.9e-01  3.7e-07  3.0e+00  7.2e+02\n",
       "    10  9.04265e-01  8.953e+02  9.789e-04   8.9e-01  3.4e-07  3.2e+00  3.1e+01\n",
       "    12  3.99381e+01  8.953e+02  2.309e-05   8.9e-01  7.4e-09  3.5e+00  3.1e+01\n",
@@ -313,7 +325,13 @@
       "itn   =      12    condA = 3.1e+01\n",
       "    normx = 6.0e+02\n",
       "    12  3.99381e+01   8.953e+02  2.309e-05\n",
-      "   8.9e-01  7.4e-09   3.5e+00  3.1e+01\n",
+      "   8.9e-01  7.4e-09   3.5e+00  3.1e+01\n"
+     ]
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
       " \n",
       "LSMR            Least-squares solution of  Ax = b\n",
       "\n",
@@ -323,37 +341,31 @@
       "atol = 1.00e-08                 conlim = 1.00e+08\n",
       "\n",
       "btol = 1.00e-08             maxiter =   198676\n",
-      "\n"
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
+      "\n",
       " \n",
       "   itn      x(1)       norm r    norm Ar  compatible   LS      norm A   cond A\n",
       "     0  0.00000e+00  1.000e+03  4.472e+02   1.0e+00  4.5e-04\n",
       "     1 -9.29233e-01  8.946e+02  4.623e+00   8.9e-01  5.2e-03  1.0e+00  1.0e+00\n",
       "     2 -7.45416e-01  8.946e+02  1.328e+00   8.9e-01  9.9e-04  1.5e+00  1.1e+00\n",
       "     3 -8.34706e-01  8.946e+02  1.107e-01   8.9e-01  7.1e-05  1.7e+00  1.5e+00\n",
-      "     4 -8.41880e-01  8.946e+02  7.140e-03   8.9e-01  3.6e-06  2.2e+00  1.8e+00\n"
+      "     4 -8.41880e-01  8.946e+02  7.140e-03   8.9e-01  3.6e-06  2.2e+00  1.8e+00\n",
+      "     5 -8.42126e-01  8.946e+02  4.176e-03   8.9e-01  2.0e-06  2.4e+00  1.8e+00\n"
      ]
     },
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "     5 -8.42126e-01  8.946e+02  4.176e-03   8.9e-01  2.0e-06  2.4e+00  1.8e+00\n",
       "     6 -8.41939e-01  8.946e+02  3.077e-03   8.9e-01  1.3e-06  2.6e+00  2.4e+00\n",
       "     7 -8.41643e-01  8.946e+02  3.077e-03   8.9e-01  1.3e-06  2.6e+00  1.9e+02\n",
-      "     8 -8.40968e-01  8.946e+02  3.077e-03   8.9e-01  1.2e-06  2.9e+00  4.2e+02\n",
-      "     9  5.02689e-01  8.946e+02  3.060e-03   8.9e-01  1.1e-06  3.0e+00  7.6e+02\n"
+      "     8 -8.40968e-01  8.946e+02  3.077e-03   8.9e-01  1.2e-06  2.9e+00  4.2e+02\n"
      ]
     },
     {
      "name": "stdout",
      "output_type": "stream",
      "text": [
+      "     9  5.02689e-01  8.946e+02  3.060e-03   8.9e-01  1.1e-06  3.0e+00  7.6e+02\n",
       "    10  1.66462e+01  8.946e+02  2.851e-03   8.9e-01  9.9e-07  3.2e+00  7.9e+01\n",
       "    12  1.22889e+02  8.946e+02  2.454e-05   8.9e-01  7.8e-09  3.5e+00  7.9e+01\n",
       " \n",
diff --git a/devel/iv/examples/advanced-examples.html b/devel/iv/examples/advanced-examples.html
index 0f0666fd0f..441dac3545 100644
--- a/devel/iv/examples/advanced-examples.html
+++ b/devel/iv/examples/advanced-examples.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Further Examples - linearmodels v6.1 (+13)</title>
+        <title>Further Examples - linearmodels v6.1 (+15)</title>
       
     
 
@@ -94,7 +94,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -104,7 +104,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -191,10 +191,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
@@ -1095,7 +1095,7 @@ <h2 id="2SLS-as-OLS">2SLS as OLS<a class="headerlink" href="#2SLS-as-OLS" title=
 Estimator:                        OLS   Adj. R-squared:                 0.1765
 No. Observations:               10089   F-statistic:                    2262.6
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000
-Time:                        09:25:02   Distribution:                  chi2(6)
+Time:                        09:29:15   Distribution:                  chi2(6)
 Cov. Estimator:                robust
 
                               Parameter Estimates
@@ -1135,7 +1135,7 @@ <h2 id="Just-identified-2SLS">Just identified 2SLS<a class="headerlink" href="#J
 Estimator:                    IV-2SLS   Adj. R-squared:                 0.0634
 No. Observations:               10089   F-statistic:                    2000.9
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000
-Time:                        09:25:02   Distribution:                  chi2(6)
+Time:                        09:29:15   Distribution:                  chi2(6)
 Cov. Estimator:                robust
 
                               Parameter Estimates
@@ -1340,7 +1340,7 @@ <h2 id="Testing-endogeneity">Testing endogeneity<a class="headerlink" href="#Tes
 Statistic: 25.2819
 P-value: 0.0000
 Distributed: chi2(1)
-WaldTestStatistic, id: 0x7fe06bb41420
+WaldTestStatistic, id: 0x7f39f9082e90
 </pre></div></div>
 </div>
 <p>The Wu-Hausman test is a variant of the Durbin test that uses a slightly different form.</p>
@@ -1363,7 +1363,7 @@ <h2 id="Testing-endogeneity">Testing endogeneity<a class="headerlink" href="#Tes
 Statistic: 25.3253
 P-value: 0.0000
 Distributed: F(1,10081)
-WaldTestStatistic, id: 0x7fe068ebe320
+WaldTestStatistic, id: 0x7f39ae58d720
 </pre></div></div>
 </div>
 <p>The test statistic can be directly replicated using the squared t-stat in a 2-stage approach where the first stage regresses the endogenous variable on the controls and instrument and the second stage regresses the dependent variable on the controls, the endogenous regressor and the residuals. If the regressor was in fact exogenous, the residuals should not be correlated with the dependent variable.</p>
@@ -1409,7 +1409,7 @@ <h2 id="Testing-endogeneity">Testing endogeneity<a class="headerlink" href="#Tes
 Statistic: 26.4542
 P-value: 0.0000
 Distributed: chi2(1)
-WaldTestStatistic, id: 0x7fe06834cd60
+WaldTestStatistic, id: 0x7f39adf64cd0
 </pre></div></div>
 </div>
 <p>Wooldridge”s score test is an alternative to the regression test, although it usually has slightly less power since it is an LM rather than a Wald type test.</p>
@@ -1432,7 +1432,7 @@ <h2 id="Testing-endogeneity">Testing endogeneity<a class="headerlink" href="#Tes
 Statistic: 24.9350
 P-value: 0.0000
 Distributed: chi2(1)
-WaldTestStatistic, id: 0x7fe06834df00
+WaldTestStatistic, id: 0x7f39adf65ea0
 </pre></div></div>
 </div>
 <h3 id="Exogeneity-Testing">Exogeneity Testing<a class="headerlink" href="#Exogeneity-Testing" title="Link to this heading">¶</a></h3>
@@ -1455,7 +1455,7 @@ <h3 id="Exogeneity-Testing">Exogeneity Testing<a class="headerlink" href="#Exoge
 Statistic: 1.0475
 P-value: 0.3061
 Distributed: chi2(1)
-WaldTestStatistic, id: 0x7fe068ebf430
+WaldTestStatistic, id: 0x7f39aead3640
 </pre></div></div>
 </div>
 <p>When all instruments are included the story changes, and some of the additional instrument (<code class="docutils literal notranslate"><span class="pre">lowincome</span></code> or <code class="docutils literal notranslate"><span class="pre">firmsz</span></code>) appear to be endogenous.</p>
@@ -1479,7 +1479,7 @@ <h3 id="Exogeneity-Testing">Exogeneity Testing<a class="headerlink" href="#Exoge
 Statistic: 11.5903
 P-value: 0.0089
 Distributed: chi2(3)
-WaldTestStatistic, id: 0x7fe06834f520
+WaldTestStatistic, id: 0x7f39adf674f0
 </pre></div></div>
 </div>
 <h2 id="Single-Instrument-Regressions">Single Instrument Regressions<a class="headerlink" href="#Single-Instrument-Regressions" title="Link to this heading">¶</a></h2>
diff --git a/devel/iv/examples/advanced-examples.ipynb b/devel/iv/examples/advanced-examples.ipynb
index b630fd1580..520e3eb5cf 100644
--- a/devel/iv/examples/advanced-examples.ipynb
+++ b/devel/iv/examples/advanced-examples.ipynb
@@ -27,10 +27,10 @@
    "execution_count": 1,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:01.134566Z",
-     "iopub.status.busy": "2024-09-24T09:25:01.134291Z",
-     "iopub.status.idle": "2024-09-24T09:25:02.204330Z",
-     "shell.execute_reply": "2024-09-24T09:25:02.203427Z"
+     "iopub.execute_input": "2024-09-24T09:29:14.208565Z",
+     "iopub.status.busy": "2024-09-24T09:29:14.208271Z",
+     "iopub.status.idle": "2024-09-24T09:29:15.367142Z",
+     "shell.execute_reply": "2024-09-24T09:29:15.366382Z"
     }
    },
    "outputs": [],
@@ -51,10 +51,10 @@
    "execution_count": 2,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:02.210034Z",
-     "iopub.status.busy": "2024-09-24T09:25:02.208483Z",
-     "iopub.status.idle": "2024-09-24T09:25:02.307530Z",
-     "shell.execute_reply": "2024-09-24T09:25:02.306805Z"
+     "iopub.execute_input": "2024-09-24T09:29:15.370346Z",
+     "iopub.status.busy": "2024-09-24T09:29:15.369881Z",
+     "iopub.status.idle": "2024-09-24T09:29:15.457643Z",
+     "shell.execute_reply": "2024-09-24T09:29:15.456934Z"
     }
    },
    "outputs": [
@@ -116,10 +116,10 @@
    "execution_count": 3,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:02.310594Z",
-     "iopub.status.busy": "2024-09-24T09:25:02.310286Z",
-     "iopub.status.idle": "2024-09-24T09:25:02.338659Z",
-     "shell.execute_reply": "2024-09-24T09:25:02.337866Z"
+     "iopub.execute_input": "2024-09-24T09:29:15.460470Z",
+     "iopub.status.busy": "2024-09-24T09:29:15.459795Z",
+     "iopub.status.idle": "2024-09-24T09:29:15.479902Z",
+     "shell.execute_reply": "2024-09-24T09:29:15.479229Z"
     }
    },
    "outputs": [
@@ -162,10 +162,10 @@
    "execution_count": 4,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:02.343115Z",
-     "iopub.status.busy": "2024-09-24T09:25:02.341600Z",
-     "iopub.status.idle": "2024-09-24T09:25:02.361931Z",
-     "shell.execute_reply": "2024-09-24T09:25:02.361187Z"
+     "iopub.execute_input": "2024-09-24T09:29:15.482195Z",
+     "iopub.status.busy": "2024-09-24T09:29:15.481982Z",
+     "iopub.status.idle": "2024-09-24T09:29:15.494058Z",
+     "shell.execute_reply": "2024-09-24T09:29:15.493397Z"
     }
    },
    "outputs": [
@@ -200,10 +200,10 @@
    "execution_count": 5,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:02.365279Z",
-     "iopub.status.busy": "2024-09-24T09:25:02.364976Z",
-     "iopub.status.idle": "2024-09-24T09:25:02.385157Z",
-     "shell.execute_reply": "2024-09-24T09:25:02.384379Z"
+     "iopub.execute_input": "2024-09-24T09:29:15.496506Z",
+     "iopub.status.busy": "2024-09-24T09:29:15.496033Z",
+     "iopub.status.idle": "2024-09-24T09:29:15.511343Z",
+     "shell.execute_reply": "2024-09-24T09:29:15.510563Z"
     }
    },
    "outputs": [
@@ -310,10 +310,10 @@
    "execution_count": 6,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:02.388468Z",
-     "iopub.status.busy": "2024-09-24T09:25:02.388174Z",
-     "iopub.status.idle": "2024-09-24T09:25:02.652394Z",
-     "shell.execute_reply": "2024-09-24T09:25:02.651466Z"
+     "iopub.execute_input": "2024-09-24T09:29:15.514100Z",
+     "iopub.status.busy": "2024-09-24T09:29:15.513761Z",
+     "iopub.status.idle": "2024-09-24T09:29:15.729121Z",
+     "shell.execute_reply": "2024-09-24T09:29:15.728234Z"
     }
    },
    "outputs": [],
@@ -339,10 +339,10 @@
    "execution_count": 7,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:02.657501Z",
-     "iopub.status.busy": "2024-09-24T09:25:02.656229Z",
-     "iopub.status.idle": "2024-09-24T09:25:02.756390Z",
-     "shell.execute_reply": "2024-09-24T09:25:02.752238Z"
+     "iopub.execute_input": "2024-09-24T09:29:15.732464Z",
+     "iopub.status.busy": "2024-09-24T09:29:15.731835Z",
+     "iopub.status.idle": "2024-09-24T09:29:15.811882Z",
+     "shell.execute_reply": "2024-09-24T09:29:15.809863Z"
     }
    },
    "outputs": [
@@ -356,7 +356,7 @@
       "Estimator:                        OLS   Adj. R-squared:                 0.1765\n",
       "No. Observations:               10089   F-statistic:                    2262.6\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000\n",
-      "Time:                        09:25:02   Distribution:                  chi2(6)\n",
+      "Time:                        09:29:15   Distribution:                  chi2(6)\n",
       "Cov. Estimator:                robust                                         \n",
       "                                                                              \n",
       "                              Parameter Estimates                              \n",
@@ -394,10 +394,10 @@
    "execution_count": 8,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:02.760962Z",
-     "iopub.status.busy": "2024-09-24T09:25:02.760654Z",
-     "iopub.status.idle": "2024-09-24T09:25:02.889953Z",
-     "shell.execute_reply": "2024-09-24T09:25:02.881781Z"
+     "iopub.execute_input": "2024-09-24T09:29:15.819730Z",
+     "iopub.status.busy": "2024-09-24T09:29:15.819445Z",
+     "iopub.status.idle": "2024-09-24T09:29:15.927998Z",
+     "shell.execute_reply": "2024-09-24T09:29:15.926303Z"
     }
    },
    "outputs": [
@@ -411,7 +411,7 @@
       "Estimator:                    IV-2SLS   Adj. R-squared:                 0.0634\n",
       "No. Observations:               10089   F-statistic:                    2000.9\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000\n",
-      "Time:                        09:25:02   Distribution:                  chi2(6)\n",
+      "Time:                        09:29:15   Distribution:                  chi2(6)\n",
       "Cov. Estimator:                robust                                         \n",
       "                                                                              \n",
       "                              Parameter Estimates                              \n",
@@ -454,10 +454,10 @@
    "execution_count": 9,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:02.892583Z",
-     "iopub.status.busy": "2024-09-24T09:25:02.892312Z",
-     "iopub.status.idle": "2024-09-24T09:25:03.003209Z",
-     "shell.execute_reply": "2024-09-24T09:25:03.002412Z"
+     "iopub.execute_input": "2024-09-24T09:29:15.932122Z",
+     "iopub.status.busy": "2024-09-24T09:29:15.930540Z",
+     "iopub.status.idle": "2024-09-24T09:29:16.008865Z",
+     "shell.execute_reply": "2024-09-24T09:29:16.008009Z"
     }
    },
    "outputs": [],
@@ -492,10 +492,10 @@
    "execution_count": 10,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:03.006646Z",
-     "iopub.status.busy": "2024-09-24T09:25:03.005698Z",
-     "iopub.status.idle": "2024-09-24T09:25:03.117186Z",
-     "shell.execute_reply": "2024-09-24T09:25:03.116381Z"
+     "iopub.execute_input": "2024-09-24T09:29:16.012739Z",
+     "iopub.status.busy": "2024-09-24T09:29:16.012311Z",
+     "iopub.status.idle": "2024-09-24T09:29:16.121615Z",
+     "shell.execute_reply": "2024-09-24T09:29:16.120779Z"
     }
    },
    "outputs": [],
@@ -522,10 +522,10 @@
    "execution_count": 11,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:03.122345Z",
-     "iopub.status.busy": "2024-09-24T09:25:03.121988Z",
-     "iopub.status.idle": "2024-09-24T09:25:03.218580Z",
-     "shell.execute_reply": "2024-09-24T09:25:03.217960Z"
+     "iopub.execute_input": "2024-09-24T09:29:16.125001Z",
+     "iopub.status.busy": "2024-09-24T09:29:16.124451Z",
+     "iopub.status.idle": "2024-09-24T09:29:16.226376Z",
+     "shell.execute_reply": "2024-09-24T09:29:16.225497Z"
     }
    },
    "outputs": [],
@@ -549,10 +549,10 @@
    "execution_count": 12,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:03.222312Z",
-     "iopub.status.busy": "2024-09-24T09:25:03.221981Z",
-     "iopub.status.idle": "2024-09-24T09:25:03.344563Z",
-     "shell.execute_reply": "2024-09-24T09:25:03.341748Z"
+     "iopub.execute_input": "2024-09-24T09:29:16.229553Z",
+     "iopub.status.busy": "2024-09-24T09:29:16.229303Z",
+     "iopub.status.idle": "2024-09-24T09:29:16.309910Z",
+     "shell.execute_reply": "2024-09-24T09:29:16.309173Z"
     }
    },
    "outputs": [],
@@ -581,10 +581,10 @@
    "execution_count": 13,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:03.347634Z",
-     "iopub.status.busy": "2024-09-24T09:25:03.347362Z",
-     "iopub.status.idle": "2024-09-24T09:25:03.737434Z",
-     "shell.execute_reply": "2024-09-24T09:25:03.734397Z"
+     "iopub.execute_input": "2024-09-24T09:29:16.313938Z",
+     "iopub.status.busy": "2024-09-24T09:29:16.313550Z",
+     "iopub.status.idle": "2024-09-24T09:29:16.632497Z",
+     "shell.execute_reply": "2024-09-24T09:29:16.631843Z"
     }
    },
    "outputs": [
@@ -629,10 +629,10 @@
    "execution_count": 14,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:03.743529Z",
-     "iopub.status.busy": "2024-09-24T09:25:03.743206Z",
-     "iopub.status.idle": "2024-09-24T09:25:03.799650Z",
-     "shell.execute_reply": "2024-09-24T09:25:03.798942Z"
+     "iopub.execute_input": "2024-09-24T09:29:16.635546Z",
+     "iopub.status.busy": "2024-09-24T09:29:16.635175Z",
+     "iopub.status.idle": "2024-09-24T09:29:16.671555Z",
+     "shell.execute_reply": "2024-09-24T09:29:16.670988Z"
     }
    },
    "outputs": [
@@ -706,10 +706,10 @@
    "execution_count": 15,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:03.803191Z",
-     "iopub.status.busy": "2024-09-24T09:25:03.802870Z",
-     "iopub.status.idle": "2024-09-24T09:25:03.955618Z",
-     "shell.execute_reply": "2024-09-24T09:25:03.954760Z"
+     "iopub.execute_input": "2024-09-24T09:29:16.674295Z",
+     "iopub.status.busy": "2024-09-24T09:29:16.674055Z",
+     "iopub.status.idle": "2024-09-24T09:29:16.815613Z",
+     "shell.execute_reply": "2024-09-24T09:29:16.814982Z"
     }
    },
    "outputs": [
@@ -721,7 +721,7 @@
        "Statistic: 25.2819\n",
        "P-value: 0.0000\n",
        "Distributed: chi2(1)\n",
-       "WaldTestStatistic, id: 0x7fe06bb41420"
+       "WaldTestStatistic, id: 0x7f39f9082e90"
       ]
      },
      "execution_count": 15,
@@ -745,10 +745,10 @@
    "execution_count": 16,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:03.958675Z",
-     "iopub.status.busy": "2024-09-24T09:25:03.958434Z",
-     "iopub.status.idle": "2024-09-24T09:25:04.116731Z",
-     "shell.execute_reply": "2024-09-24T09:25:04.115936Z"
+     "iopub.execute_input": "2024-09-24T09:29:16.818772Z",
+     "iopub.status.busy": "2024-09-24T09:29:16.818357Z",
+     "iopub.status.idle": "2024-09-24T09:29:16.954594Z",
+     "shell.execute_reply": "2024-09-24T09:29:16.953983Z"
     }
    },
    "outputs": [
@@ -760,7 +760,7 @@
        "Statistic: 25.3253\n",
        "P-value: 0.0000\n",
        "Distributed: F(1,10081)\n",
-       "WaldTestStatistic, id: 0x7fe068ebe320"
+       "WaldTestStatistic, id: 0x7f39ae58d720"
       ]
      },
      "execution_count": 16,
@@ -784,10 +784,10 @@
    "execution_count": 17,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:04.121251Z",
-     "iopub.status.busy": "2024-09-24T09:25:04.120856Z",
-     "iopub.status.idle": "2024-09-24T09:25:04.305224Z",
-     "shell.execute_reply": "2024-09-24T09:25:04.304524Z"
+     "iopub.execute_input": "2024-09-24T09:29:16.958155Z",
+     "iopub.status.busy": "2024-09-24T09:29:16.957145Z",
+     "iopub.status.idle": "2024-09-24T09:29:17.116273Z",
+     "shell.execute_reply": "2024-09-24T09:29:17.115633Z"
     }
    },
    "outputs": [
@@ -821,10 +821,10 @@
    "execution_count": 18,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:04.310066Z",
-     "iopub.status.busy": "2024-09-24T09:25:04.309721Z",
-     "iopub.status.idle": "2024-09-24T09:25:04.385587Z",
-     "shell.execute_reply": "2024-09-24T09:25:04.384932Z"
+     "iopub.execute_input": "2024-09-24T09:29:17.118936Z",
+     "iopub.status.busy": "2024-09-24T09:29:17.118709Z",
+     "iopub.status.idle": "2024-09-24T09:29:17.174016Z",
+     "shell.execute_reply": "2024-09-24T09:29:17.173001Z"
     }
    },
    "outputs": [
@@ -836,7 +836,7 @@
        "Statistic: 26.4542\n",
        "P-value: 0.0000\n",
        "Distributed: chi2(1)\n",
-       "WaldTestStatistic, id: 0x7fe06834cd60"
+       "WaldTestStatistic, id: 0x7f39adf64cd0"
       ]
      },
      "execution_count": 18,
@@ -860,10 +860,10 @@
    "execution_count": 19,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:04.389055Z",
-     "iopub.status.busy": "2024-09-24T09:25:04.388760Z",
-     "iopub.status.idle": "2024-09-24T09:25:04.538078Z",
-     "shell.execute_reply": "2024-09-24T09:25:04.535386Z"
+     "iopub.execute_input": "2024-09-24T09:29:17.176601Z",
+     "iopub.status.busy": "2024-09-24T09:29:17.176385Z",
+     "iopub.status.idle": "2024-09-24T09:29:17.254511Z",
+     "shell.execute_reply": "2024-09-24T09:29:17.251173Z"
     }
    },
    "outputs": [
@@ -875,7 +875,7 @@
        "Statistic: 24.9350\n",
        "P-value: 0.0000\n",
        "Distributed: chi2(1)\n",
-       "WaldTestStatistic, id: 0x7fe06834df00"
+       "WaldTestStatistic, id: 0x7f39adf65ea0"
       ]
      },
      "execution_count": 19,
@@ -900,10 +900,10 @@
    "execution_count": 20,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:04.545089Z",
-     "iopub.status.busy": "2024-09-24T09:25:04.541279Z",
-     "iopub.status.idle": "2024-09-24T09:25:04.553071Z",
-     "shell.execute_reply": "2024-09-24T09:25:04.550167Z"
+     "iopub.execute_input": "2024-09-24T09:29:17.259548Z",
+     "iopub.status.busy": "2024-09-24T09:29:17.259246Z",
+     "iopub.status.idle": "2024-09-24T09:29:17.267624Z",
+     "shell.execute_reply": "2024-09-24T09:29:17.266916Z"
     }
    },
    "outputs": [
@@ -914,7 +914,7 @@
        "Statistic: 1.0475\n",
        "P-value: 0.3061\n",
        "Distributed: chi2(1)\n",
-       "WaldTestStatistic, id: 0x7fe068ebf430"
+       "WaldTestStatistic, id: 0x7f39aead3640"
       ]
      },
      "execution_count": 20,
@@ -938,10 +938,10 @@
    "execution_count": 21,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:04.559109Z",
-     "iopub.status.busy": "2024-09-24T09:25:04.555743Z",
-     "iopub.status.idle": "2024-09-24T09:25:04.654828Z",
-     "shell.execute_reply": "2024-09-24T09:25:04.654045Z"
+     "iopub.execute_input": "2024-09-24T09:29:17.271136Z",
+     "iopub.status.busy": "2024-09-24T09:29:17.270028Z",
+     "iopub.status.idle": "2024-09-24T09:29:17.335512Z",
+     "shell.execute_reply": "2024-09-24T09:29:17.334980Z"
     }
    },
    "outputs": [
@@ -952,7 +952,7 @@
        "Statistic: 11.5903\n",
        "P-value: 0.0089\n",
        "Distributed: chi2(3)\n",
-       "WaldTestStatistic, id: 0x7fe06834f520"
+       "WaldTestStatistic, id: 0x7f39adf674f0"
       ]
      },
      "execution_count": 21,
@@ -979,10 +979,10 @@
    "execution_count": 22,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:04.659086Z",
-     "iopub.status.busy": "2024-09-24T09:25:04.657346Z",
-     "iopub.status.idle": "2024-09-24T09:25:05.063607Z",
-     "shell.execute_reply": "2024-09-24T09:25:05.062718Z"
+     "iopub.execute_input": "2024-09-24T09:29:17.338542Z",
+     "iopub.status.busy": "2024-09-24T09:29:17.338312Z",
+     "iopub.status.idle": "2024-09-24T09:29:17.544374Z",
+     "shell.execute_reply": "2024-09-24T09:29:17.542754Z"
     }
    },
    "outputs": [
@@ -1048,10 +1048,10 @@
    "execution_count": 23,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:05.068801Z",
-     "iopub.status.busy": "2024-09-24T09:25:05.068363Z",
-     "iopub.status.idle": "2024-09-24T09:25:05.408913Z",
-     "shell.execute_reply": "2024-09-24T09:25:05.407825Z"
+     "iopub.execute_input": "2024-09-24T09:29:17.547893Z",
+     "iopub.status.busy": "2024-09-24T09:29:17.547038Z",
+     "iopub.status.idle": "2024-09-24T09:29:17.846594Z",
+     "shell.execute_reply": "2024-09-24T09:29:17.845993Z"
     }
    },
    "outputs": [
@@ -1107,10 +1107,10 @@
    "execution_count": 24,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:05.413351Z",
-     "iopub.status.busy": "2024-09-24T09:25:05.413097Z",
-     "iopub.status.idle": "2024-09-24T09:25:05.666036Z",
-     "shell.execute_reply": "2024-09-24T09:25:05.665338Z"
+     "iopub.execute_input": "2024-09-24T09:29:17.852039Z",
+     "iopub.status.busy": "2024-09-24T09:29:17.851710Z",
+     "iopub.status.idle": "2024-09-24T09:29:18.228553Z",
+     "shell.execute_reply": "2024-09-24T09:29:18.227904Z"
     }
    },
    "outputs": [
@@ -1175,10 +1175,10 @@
    "execution_count": 25,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:05.669216Z",
-     "iopub.status.busy": "2024-09-24T09:25:05.668967Z",
-     "iopub.status.idle": "2024-09-24T09:25:05.797645Z",
-     "shell.execute_reply": "2024-09-24T09:25:05.796939Z"
+     "iopub.execute_input": "2024-09-24T09:29:18.231351Z",
+     "iopub.status.busy": "2024-09-24T09:29:18.230860Z",
+     "iopub.status.idle": "2024-09-24T09:29:18.383776Z",
+     "shell.execute_reply": "2024-09-24T09:29:18.383053Z"
     }
    },
    "outputs": [
@@ -1242,10 +1242,10 @@
    "execution_count": 26,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:05.801421Z",
-     "iopub.status.busy": "2024-09-24T09:25:05.800512Z",
-     "iopub.status.idle": "2024-09-24T09:25:05.807499Z",
-     "shell.execute_reply": "2024-09-24T09:25:05.806920Z"
+     "iopub.execute_input": "2024-09-24T09:29:18.386498Z",
+     "iopub.status.busy": "2024-09-24T09:29:18.386080Z",
+     "iopub.status.idle": "2024-09-24T09:29:18.389872Z",
+     "shell.execute_reply": "2024-09-24T09:29:18.389239Z"
     }
    },
    "outputs": [
@@ -1275,10 +1275,10 @@
    "execution_count": 27,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:05.809923Z",
-     "iopub.status.busy": "2024-09-24T09:25:05.809680Z",
-     "iopub.status.idle": "2024-09-24T09:25:05.865538Z",
-     "shell.execute_reply": "2024-09-24T09:25:05.864924Z"
+     "iopub.execute_input": "2024-09-24T09:29:18.392071Z",
+     "iopub.status.busy": "2024-09-24T09:29:18.391793Z",
+     "iopub.status.idle": "2024-09-24T09:29:18.445265Z",
+     "shell.execute_reply": "2024-09-24T09:29:18.443028Z"
     }
    },
    "outputs": [
diff --git a/devel/iv/examples/basic-examples.html b/devel/iv/examples/basic-examples.html
index 445f68cd0b..a4bcd3d60b 100644
--- a/devel/iv/examples/basic-examples.html
+++ b/devel/iv/examples/basic-examples.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Basic Examples - linearmodels v6.1 (+13)</title>
+        <title>Basic Examples - linearmodels v6.1 (+15)</title>
       
     
 
@@ -94,7 +94,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -104,7 +104,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -191,10 +191,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
@@ -796,7 +796,7 @@ <h2 id="Wages-of-Married-Women">Wages of Married Women<a class="headerlink" href
 Estimator:                        OLS   Adj. R-squared:                 0.1158
 No. Observations:                 428   F-statistic:                    57.196
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000
-Time:                        09:25:08   Distribution:                  chi2(1)
+Time:                        09:29:21   Distribution:                  chi2(1)
 Cov. Estimator:            unadjusted
 
                              Parameter Estimates
@@ -833,7 +833,7 @@ <h2 id="Wages-of-Married-Women">Wages of Married Women<a class="headerlink" href
 Estimator:                        OLS   Adj. R-squared:                 0.1706
 No. Observations:                 428   F-statistic:                    89.258
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000
-Time:                        09:25:08   Distribution:                  chi2(1)
+Time:                        09:29:21   Distribution:                  chi2(1)
 Cov. Estimator:            unadjusted
 
                              Parameter Estimates
@@ -868,7 +868,7 @@ <h2 id="Wages-of-Married-Women">Wages of Married Women<a class="headerlink" href
 Estimator:                    IV-2SLS   Adj. R-squared:                 0.0913
 No. Observations:                 428   F-statistic:                    2.8487
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0914
-Time:                        09:25:09   Distribution:                  chi2(1)
+Time:                        09:29:21   Distribution:                  chi2(1)
 Cov. Estimator:            unadjusted
 
                              Parameter Estimates
@@ -999,7 +999,7 @@ <h2 id="Wages-of-Men">Wages of Men<a class="headerlink" href="#Wages-of-Men" tit
 Estimator:                        OLS   Adj. R-squared:                 0.0964
 No. Observations:                 934   F-statistic:                    100.71
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000
-Time:                        09:25:09   Distribution:                  chi2(1)
+Time:                        09:29:21   Distribution:                  chi2(1)
 Cov. Estimator:            unadjusted
 
                              Parameter Estimates
@@ -1034,7 +1034,7 @@ <h2 id="Wages-of-Men">Wages of Men<a class="headerlink" href="#Wages-of-Men" tit
 Estimator:                        OLS   Adj. R-squared:                 0.0566
 No. Observations:                 934   F-statistic:                    57.107
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000
-Time:                        09:25:09   Distribution:                  chi2(1)
+Time:                        09:29:21   Distribution:                  chi2(1)
 Cov. Estimator:            unadjusted
 
                              Parameter Estimates
@@ -1067,7 +1067,7 @@ <h2 id="Wages-of-Men">Wages of Men<a class="headerlink" href="#Wages-of-Men" tit
 Estimator:                    IV-2SLS   Adj. R-squared:                -0.0101
 No. Observations:                 934   F-statistic:                    21.715
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000
-Time:                        09:25:09   Distribution:                  chi2(1)
+Time:                        09:29:21   Distribution:                  chi2(1)
 Cov. Estimator:            unadjusted
 
                              Parameter Estimates
@@ -1110,7 +1110,7 @@ <h2 id="Weighted-IV">Weighted IV<a class="headerlink" href="#Weighted-IV" title=
 Estimator:                        OLS   Adj. R-squared:                 0.0024
 No. Observations:                 934   F-statistic:                    3.9903
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.1360
-Time:                        09:25:09   Distribution:                  chi2(2)
+Time:                        09:29:21   Distribution:                  chi2(2)
 Cov. Estimator:                robust
 
                              Parameter Estimates
@@ -1146,7 +1146,7 @@ <h2 id="Weighted-IV">Weighted IV<a class="headerlink" href="#Weighted-IV" title=
 Estimator:                    IV-2SLS   Adj. R-squared:                 0.0080
 No. Observations:                 934   F-statistic:                    23.520
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000
-Time:                        09:25:09   Distribution:                  chi2(1)
+Time:                        09:29:21   Distribution:                  chi2(1)
 Cov. Estimator:            unadjusted
 
                              Parameter Estimates
@@ -1227,7 +1227,7 @@ <h2 id="Smoking-and-birth-weight">Smoking and birth weight<a class="headerlink"
 Estimator:                        OLS   Adj. R-squared:                 0.0008
 No. Observations:                1388   F-statistic:                    2.0731
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.1499
-Time:                        09:25:09   Distribution:                  chi2(1)
+Time:                        09:29:22   Distribution:                  chi2(1)
 Cov. Estimator:            unadjusted
 
                              Parameter Estimates
@@ -1262,7 +1262,7 @@ <h2 id="Smoking-and-birth-weight">Smoking and birth weight<a class="headerlink"
 Estimator:                    IV-2SLS   Adj. R-squared:                -1.5242
 No. Observations:                1388   F-statistic:                    1.1356
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.2866
-Time:                        09:25:09   Distribution:                  chi2(1)
+Time:                        09:29:22   Distribution:                  chi2(1)
 Cov. Estimator:            unadjusted
 
                              Parameter Estimates
@@ -1391,7 +1391,7 @@ <h2 id="Proximity-and-education">Proximity and education<a class="headerlink" hr
 Estimator:                        OLS   Adj. R-squared:                 0.4745
 No. Observations:                3010   F-statistic:                    3693.4
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000
-Time:                        09:25:09   Distribution:                 chi2(15)
+Time:                        09:29:22   Distribution:                 chi2(15)
 Cov. Estimator:                robust
 
                              Parameter Estimates
@@ -1438,7 +1438,7 @@ <h2 id="Proximity-and-education">Proximity and education<a class="headerlink" hr
 Estimator:                        OLS   Adj. R-squared:                 0.2963
 No. Observations:                3010   F-statistic:                    1377.0
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000
-Time:                        09:25:09   Distribution:                 chi2(15)
+Time:                        09:29:22   Distribution:                 chi2(15)
 Cov. Estimator:                robust
 
                              Parameter Estimates
@@ -1485,7 +1485,7 @@ <h2 id="Proximity-and-education">Proximity and education<a class="headerlink" hr
 Estimator:                    IV-2SLS   Adj. R-squared:                 0.2343
 No. Observations:                3010   F-statistic:                    840.83
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000
-Time:                        09:25:09   Distribution:                 chi2(15)
+Time:                        09:29:22   Distribution:                 chi2(15)
 Cov. Estimator:                robust
 
                              Parameter Estimates
@@ -1644,7 +1644,7 @@ <h2 id="Categorical-Variables">Categorical Variables<a class="headerlink" href="
 Estimator:                    IV-2SLS   Adj. R-squared:                 0.2343
 No. Observations:                3010   F-statistic:                    840.83
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000
-Time:                        09:25:09   Distribution:                 chi2(15)
+Time:                        09:29:22   Distribution:                 chi2(15)
 Cov. Estimator:                robust
 
                              Parameter Estimates
@@ -1713,7 +1713,7 @@ <h2 id="Post-estimation-diagnostics">Post-estimation diagnostics<a class="header
 Estimator:                    IV-2SLS   Adj. R-squared:                 0.1296
 No. Observations:                 428   F-statistic:                    24.653
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000
-Time:                        09:25:09   Distribution:                  chi2(3)
+Time:                        09:29:22   Distribution:                  chi2(3)
 Cov. Estimator:            unadjusted
 
                              Parameter Estimates
@@ -1752,7 +1752,7 @@ <h2 id="Post-estimation-diagnostics">Post-estimation diagnostics<a class="header
 Statistic: 2.8256
 P-value: 0.0928
 Distributed: chi2(1)
-WaldTestStatistic, id: 0x7f96042f22f0
+WaldTestStatistic, id: 0x7f0dd43170a0
 </pre></div></div>
 </div>
 <p>This test can be easily implemented using two regression. The first one constructs the residuals and the second re-fits the model using 2SLS but including the residuals.</p>
@@ -1782,7 +1782,7 @@ <h2 id="Post-estimation-diagnostics">Post-estimation diagnostics<a class="header
 Estimator:                    IV-2SLS   Adj. R-squared:                 0.1544
 No. Observations:                 428   F-statistic:                    82.954
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000
-Time:                        09:25:09   Distribution:                  chi2(4)
+Time:                        09:29:22   Distribution:                  chi2(4)
 Cov. Estimator:            unadjusted
 
                              Parameter Estimates
@@ -1822,7 +1822,7 @@ <h2 id="Post-estimation-diagnostics">Post-estimation diagnostics<a class="header
 Statistic: 0.4435
 P-value: 0.5055
 Distributed: chi2(1)
-WaldTestStatistic, id: 0x7f96042f1ed0
+WaldTestStatistic, id: 0x7f0dd4314400
 </pre></div></div>
 </div>
 <p>A naive version of this test can be directly implemented. This direct implementation is different from the formal test but would be consistent if the model was overidentified.</p>
@@ -1883,7 +1883,7 @@ <h2 id="Post-estimation-diagnostics">Post-estimation diagnostics<a class="header
 Statistic: 1.0421
 P-value: 0.5939
 Distributed: chi2(2)
-WaldTestStatistic, id: 0x7f96043d4130
+WaldTestStatistic, id: 0x7f0dd442f730
 </pre></div></div>
 </div>
 <p>Directly testing using two regression would reach the same conclusion.</p>
@@ -2057,7 +2057,7 @@ <h2 id="Panel-IV">Panel IV<a class="headerlink" href="#Panel-IV" title="Link to
 Estimator:                        OLS   Adj. R-squared:                 0.3255
 No. Observations:                  45   F-statistic:                    23.266
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000
-Time:                        09:25:09   Distribution:                  chi2(1)
+Time:                        09:29:22   Distribution:                  chi2(1)
 Cov. Estimator:            unadjusted
 
                              Parameter Estimates
@@ -2091,7 +2091,7 @@ <h2 id="Panel-IV">Panel IV<a class="headerlink" href="#Panel-IV" title="Link to
 Estimator:                    IV-2SLS   Adj. R-squared:                -0.0070
 No. Observations:                  45   F-statistic:                    3.3464
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0674
-Time:                        09:25:09   Distribution:                  chi2(1)
+Time:                        09:29:22   Distribution:                  chi2(1)
 Cov. Estimator:            unadjusted
 
                              Parameter Estimates
diff --git a/devel/iv/examples/basic-examples.ipynb b/devel/iv/examples/basic-examples.ipynb
index 1fc006de16..5e070bbe77 100644
--- a/devel/iv/examples/basic-examples.ipynb
+++ b/devel/iv/examples/basic-examples.ipynb
@@ -30,10 +30,10 @@
    "execution_count": 1,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:08.143701Z",
-     "iopub.status.busy": "2024-09-24T09:25:08.143502Z",
-     "iopub.status.idle": "2024-09-24T09:25:08.970469Z",
-     "shell.execute_reply": "2024-09-24T09:25:08.969800Z"
+     "iopub.execute_input": "2024-09-24T09:29:20.981857Z",
+     "iopub.status.busy": "2024-09-24T09:29:20.981662Z",
+     "iopub.status.idle": "2024-09-24T09:29:21.839573Z",
+     "shell.execute_reply": "2024-09-24T09:29:21.838838Z"
     }
    },
    "outputs": [
@@ -97,10 +97,10 @@
    "execution_count": 2,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:08.972784Z",
-     "iopub.status.busy": "2024-09-24T09:25:08.972348Z",
-     "iopub.status.idle": "2024-09-24T09:25:08.986467Z",
-     "shell.execute_reply": "2024-09-24T09:25:08.985884Z"
+     "iopub.execute_input": "2024-09-24T09:29:21.842001Z",
+     "iopub.status.busy": "2024-09-24T09:29:21.841560Z",
+     "iopub.status.idle": "2024-09-24T09:29:21.856167Z",
+     "shell.execute_reply": "2024-09-24T09:29:21.855573Z"
     },
     "scrolled": true
    },
@@ -115,7 +115,7 @@
       "Estimator:                        OLS   Adj. R-squared:                 0.1158\n",
       "No. Observations:                 428   F-statistic:                    57.196\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000\n",
-      "Time:                        09:25:08   Distribution:                  chi2(1)\n",
+      "Time:                        09:29:21   Distribution:                  chi2(1)\n",
       "Cov. Estimator:            unadjusted                                         \n",
       "                                                                              \n",
       "                             Parameter Estimates                              \n",
@@ -151,10 +151,10 @@
    "execution_count": 3,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:08.988477Z",
-     "iopub.status.busy": "2024-09-24T09:25:08.988093Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.001568Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.000925Z"
+     "iopub.execute_input": "2024-09-24T09:29:21.858426Z",
+     "iopub.status.busy": "2024-09-24T09:29:21.857931Z",
+     "iopub.status.idle": "2024-09-24T09:29:21.872192Z",
+     "shell.execute_reply": "2024-09-24T09:29:21.871602Z"
     }
    },
    "outputs": [
@@ -168,7 +168,7 @@
       "Estimator:                        OLS   Adj. R-squared:                 0.1706\n",
       "No. Observations:                 428   F-statistic:                    89.258\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000\n",
-      "Time:                        09:25:08   Distribution:                  chi2(1)\n",
+      "Time:                        09:29:21   Distribution:                  chi2(1)\n",
       "Cov. Estimator:            unadjusted                                         \n",
       "                                                                              \n",
       "                             Parameter Estimates                              \n",
@@ -201,10 +201,10 @@
    "execution_count": 4,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.003706Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.003346Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.018627Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.018000Z"
+     "iopub.execute_input": "2024-09-24T09:29:21.874290Z",
+     "iopub.status.busy": "2024-09-24T09:29:21.873882Z",
+     "iopub.status.idle": "2024-09-24T09:29:21.887597Z",
+     "shell.execute_reply": "2024-09-24T09:29:21.886970Z"
     }
    },
    "outputs": [
@@ -218,7 +218,7 @@
       "Estimator:                    IV-2SLS   Adj. R-squared:                 0.0913\n",
       "No. Observations:                 428   F-statistic:                    2.8487\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0914\n",
-      "Time:                        09:25:09   Distribution:                  chi2(1)\n",
+      "Time:                        09:29:21   Distribution:                  chi2(1)\n",
       "Cov. Estimator:            unadjusted                                         \n",
       "                                                                              \n",
       "                             Parameter Estimates                              \n",
@@ -257,10 +257,10 @@
    "execution_count": 5,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.020939Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.020492Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.040748Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.040223Z"
+     "iopub.execute_input": "2024-09-24T09:29:21.889620Z",
+     "iopub.status.busy": "2024-09-24T09:29:21.889424Z",
+     "iopub.status.idle": "2024-09-24T09:29:21.908904Z",
+     "shell.execute_reply": "2024-09-24T09:29:21.908287Z"
     }
    },
    "outputs": [
@@ -317,10 +317,10 @@
    "execution_count": 6,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.042671Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.042285Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.052281Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.051722Z"
+     "iopub.execute_input": "2024-09-24T09:29:21.910841Z",
+     "iopub.status.busy": "2024-09-24T09:29:21.910645Z",
+     "iopub.status.idle": "2024-09-24T09:29:21.920805Z",
+     "shell.execute_reply": "2024-09-24T09:29:21.920195Z"
     }
    },
    "outputs": [
@@ -375,10 +375,10 @@
    "execution_count": 7,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.054314Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.054009Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.067676Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.067137Z"
+     "iopub.execute_input": "2024-09-24T09:29:21.922598Z",
+     "iopub.status.busy": "2024-09-24T09:29:21.922405Z",
+     "iopub.status.idle": "2024-09-24T09:29:21.936910Z",
+     "shell.execute_reply": "2024-09-24T09:29:21.936261Z"
     }
    },
    "outputs": [
@@ -392,7 +392,7 @@
       "Estimator:                        OLS   Adj. R-squared:                 0.0964\n",
       "No. Observations:                 934   F-statistic:                    100.71\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000\n",
-      "Time:                        09:25:09   Distribution:                  chi2(1)\n",
+      "Time:                        09:29:21   Distribution:                  chi2(1)\n",
       "Cov. Estimator:            unadjusted                                         \n",
       "                                                                              \n",
       "                             Parameter Estimates                              \n",
@@ -424,10 +424,10 @@
    "execution_count": 8,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.069734Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.069337Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.082759Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.082224Z"
+     "iopub.execute_input": "2024-09-24T09:29:21.939000Z",
+     "iopub.status.busy": "2024-09-24T09:29:21.938603Z",
+     "iopub.status.idle": "2024-09-24T09:29:21.952279Z",
+     "shell.execute_reply": "2024-09-24T09:29:21.951701Z"
     }
    },
    "outputs": [
@@ -441,7 +441,7 @@
       "Estimator:                        OLS   Adj. R-squared:                 0.0566\n",
       "No. Observations:                 934   F-statistic:                    57.107\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000\n",
-      "Time:                        09:25:09   Distribution:                  chi2(1)\n",
+      "Time:                        09:29:21   Distribution:                  chi2(1)\n",
       "Cov. Estimator:            unadjusted                                         \n",
       "                                                                              \n",
       "                             Parameter Estimates                              \n",
@@ -473,10 +473,10 @@
    "execution_count": 9,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.084862Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.084482Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.098684Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.098178Z"
+     "iopub.execute_input": "2024-09-24T09:29:21.954486Z",
+     "iopub.status.busy": "2024-09-24T09:29:21.954107Z",
+     "iopub.status.idle": "2024-09-24T09:29:21.968643Z",
+     "shell.execute_reply": "2024-09-24T09:29:21.967977Z"
     }
    },
    "outputs": [
@@ -490,7 +490,7 @@
       "Estimator:                    IV-2SLS   Adj. R-squared:                -0.0101\n",
       "No. Observations:                 934   F-statistic:                    21.715\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000\n",
-      "Time:                        09:25:09   Distribution:                  chi2(1)\n",
+      "Time:                        09:29:21   Distribution:                  chi2(1)\n",
       "Cov. Estimator:            unadjusted                                         \n",
       "                                                                              \n",
       "                             Parameter Estimates                              \n",
@@ -529,10 +529,10 @@
    "execution_count": 10,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.100737Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.100349Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.115311Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.114763Z"
+     "iopub.execute_input": "2024-09-24T09:29:21.970613Z",
+     "iopub.status.busy": "2024-09-24T09:29:21.970407Z",
+     "iopub.status.idle": "2024-09-24T09:29:21.985913Z",
+     "shell.execute_reply": "2024-09-24T09:29:21.985256Z"
     }
    },
    "outputs": [
@@ -546,7 +546,7 @@
       "Estimator:                        OLS   Adj. R-squared:                 0.0024\n",
       "No. Observations:                 934   F-statistic:                    3.9903\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.1360\n",
-      "Time:                        09:25:09   Distribution:                  chi2(2)\n",
+      "Time:                        09:29:21   Distribution:                  chi2(2)\n",
       "Cov. Estimator:                robust                                         \n",
       "                                                                              \n",
       "                             Parameter Estimates                              \n",
@@ -580,10 +580,10 @@
    "execution_count": 11,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.117442Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.117062Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.131532Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.130827Z"
+     "iopub.execute_input": "2024-09-24T09:29:21.988014Z",
+     "iopub.status.busy": "2024-09-24T09:29:21.987787Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.002474Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.001973Z"
     }
    },
    "outputs": [
@@ -597,7 +597,7 @@
       "Estimator:                    IV-2SLS   Adj. R-squared:                 0.0080\n",
       "No. Observations:                 934   F-statistic:                    23.520\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000\n",
-      "Time:                        09:25:09   Distribution:                  chi2(1)\n",
+      "Time:                        09:29:21   Distribution:                  chi2(1)\n",
       "Cov. Estimator:            unadjusted                                         \n",
       "                                                                              \n",
       "                             Parameter Estimates                              \n",
@@ -635,10 +635,10 @@
    "execution_count": 12,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.133502Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.133301Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.144993Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.144424Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.004553Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.004102Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.015845Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.015293Z"
     }
    },
    "outputs": [
@@ -689,10 +689,10 @@
    "execution_count": 13,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.146985Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.146585Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.161640Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.161075Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.017922Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.017557Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.032879Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.032363Z"
     }
    },
    "outputs": [
@@ -706,7 +706,7 @@
       "Estimator:                        OLS   Adj. R-squared:                 0.0008\n",
       "No. Observations:                1388   F-statistic:                    2.0731\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.1499\n",
-      "Time:                        09:25:09   Distribution:                  chi2(1)\n",
+      "Time:                        09:29:22   Distribution:                  chi2(1)\n",
       "Cov. Estimator:            unadjusted                                         \n",
       "                                                                              \n",
       "                             Parameter Estimates                              \n",
@@ -738,10 +738,10 @@
    "execution_count": 14,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.163713Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.163252Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.178642Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.178070Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.035071Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.034674Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.049098Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.048554Z"
     }
    },
    "outputs": [
@@ -755,7 +755,7 @@
       "Estimator:                    IV-2SLS   Adj. R-squared:                -1.5242\n",
       "No. Observations:                1388   F-statistic:                    1.1356\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.2866\n",
-      "Time:                        09:25:09   Distribution:                  chi2(1)\n",
+      "Time:                        09:29:22   Distribution:                  chi2(1)\n",
       "Cov. Estimator:            unadjusted                                         \n",
       "                                                                              \n",
       "                             Parameter Estimates                              \n",
@@ -794,10 +794,10 @@
    "execution_count": 15,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.180807Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.180435Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.203783Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.203136Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.051065Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.050848Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.076004Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.075410Z"
     }
    },
    "outputs": [
@@ -869,10 +869,10 @@
    "execution_count": 16,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.206000Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.205586Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.210549Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.210039Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.077935Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.077731Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.082565Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.082066Z"
     }
    },
    "outputs": [],
@@ -912,10 +912,10 @@
    "execution_count": 17,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.212551Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.212168Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.243659Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.242797Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.084332Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.084140Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.117129Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.116444Z"
     }
    },
    "outputs": [
@@ -929,7 +929,7 @@
       "Estimator:                        OLS   Adj. R-squared:                 0.4745\n",
       "No. Observations:                3010   F-statistic:                    3693.4\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000\n",
-      "Time:                        09:25:09   Distribution:                 chi2(15)\n",
+      "Time:                        09:29:22   Distribution:                 chi2(15)\n",
       "Cov. Estimator:                robust                                         \n",
       "                                                                              \n",
       "                             Parameter Estimates                              \n",
@@ -952,7 +952,14 @@
       "reg667        -0.2168     0.2389    -0.9077     0.3640     -0.6850      0.2513\n",
       "reg668         0.5239     0.2562     2.0449     0.0409      0.0218      1.0260\n",
       "reg669         0.2103     0.1988     1.0575     0.2903     -0.1794      0.6000\n",
-      "==============================================================================\n"
+      "=============================================================================="
+     ]
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "\n"
      ]
     }
    ],
@@ -973,10 +980,10 @@
    "execution_count": 18,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.246260Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.246029Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.281371Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.280751Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.119562Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.119331Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.155464Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.154803Z"
     }
    },
    "outputs": [
@@ -990,7 +997,7 @@
       "Estimator:                        OLS   Adj. R-squared:                 0.2963\n",
       "No. Observations:                3010   F-statistic:                    1377.0\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000\n",
-      "Time:                        09:25:09   Distribution:                 chi2(15)\n",
+      "Time:                        09:29:22   Distribution:                 chi2(15)\n",
       "Cov. Estimator:                robust                                         \n",
       "                                                                              \n",
       "                             Parameter Estimates                              \n",
@@ -1013,7 +1020,14 @@
       "reg668        -0.0564     0.0505    -1.1183     0.2634     -0.1553      0.0425\n",
       "reg669         0.1186     0.0387     3.0658     0.0022      0.0428      0.1944\n",
       "educ           0.0747     0.0036     20.540     0.0000      0.0676      0.0818\n",
-      "==============================================================================\n"
+      "=============================================================================="
+     ]
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "\n"
      ]
     }
    ],
@@ -1034,10 +1048,10 @@
    "execution_count": 19,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.284044Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.283559Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.318319Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.317712Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.158711Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.157707Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.192875Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.192167Z"
     }
    },
    "outputs": [
@@ -1051,7 +1065,7 @@
       "Estimator:                    IV-2SLS   Adj. R-squared:                 0.2343\n",
       "No. Observations:                3010   F-statistic:                    840.83\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000\n",
-      "Time:                        09:25:09   Distribution:                 chi2(15)\n",
+      "Time:                        09:29:22   Distribution:                 chi2(15)\n",
       "Cov. Estimator:                robust                                         \n",
       "                                                                              \n",
       "                             Parameter Estimates                              \n",
@@ -1109,10 +1123,10 @@
    "execution_count": 20,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.321408Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.320425Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.421006Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.420299Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.196181Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.195148Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.295019Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.294373Z"
     }
    },
    "outputs": [
@@ -1196,10 +1210,10 @@
    "execution_count": 21,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.424090Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.423458Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.458930Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.458305Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.298436Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.297402Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.332843Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.332238Z"
     }
    },
    "outputs": [
@@ -1236,10 +1250,10 @@
    "execution_count": 22,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.461829Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.461199Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.596237Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.595535Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.336229Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.335180Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.476883Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.476203Z"
     }
    },
    "outputs": [
@@ -1253,7 +1267,7 @@
       "Estimator:                    IV-2SLS   Adj. R-squared:                 0.2343\n",
       "No. Observations:                3010   F-statistic:                    840.83\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000\n",
-      "Time:                        09:25:09   Distribution:                 chi2(15)\n",
+      "Time:                        09:29:22   Distribution:                 chi2(15)\n",
       "Cov. Estimator:                robust                                         \n",
       "                                                                              \n",
       "                             Parameter Estimates                              \n",
@@ -1315,10 +1329,10 @@
    "execution_count": 23,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.599054Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.598414Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.614501Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.613781Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.480002Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.479736Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.496104Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.495456Z"
     }
    },
    "outputs": [],
@@ -1345,10 +1359,10 @@
    "execution_count": 24,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.617274Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.616804Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.634542Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.633918Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.498729Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.498513Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.513836Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.513213Z"
     }
    },
    "outputs": [
@@ -1362,7 +1376,7 @@
       "Estimator:                    IV-2SLS   Adj. R-squared:                 0.1296\n",
       "No. Observations:                 428   F-statistic:                    24.653\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000\n",
-      "Time:                        09:25:09   Distribution:                  chi2(3)\n",
+      "Time:                        09:29:22   Distribution:                  chi2(3)\n",
       "Cov. Estimator:            unadjusted                                         \n",
       "                                                                              \n",
       "                             Parameter Estimates                              \n",
@@ -1399,10 +1413,10 @@
    "execution_count": 25,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.636651Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.636322Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.649381Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.648814Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.515718Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.515508Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.527650Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.527095Z"
     }
    },
    "outputs": [
@@ -1414,7 +1428,7 @@
        "Statistic: 2.8256\n",
        "P-value: 0.0928\n",
        "Distributed: chi2(1)\n",
-       "WaldTestStatistic, id: 0x7f96042f22f0"
+       "WaldTestStatistic, id: 0x7f0dd43170a0"
       ]
      },
      "execution_count": 25,
@@ -1440,10 +1454,10 @@
    "execution_count": 26,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.651584Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.651217Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.674191Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.673579Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.529487Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.529292Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.551279Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.550696Z"
     }
    },
    "outputs": [
@@ -1457,7 +1471,7 @@
       "Estimator:                    IV-2SLS   Adj. R-squared:                 0.1544\n",
       "No. Observations:                 428   F-statistic:                    82.954\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000\n",
-      "Time:                        09:25:09   Distribution:                  chi2(4)\n",
+      "Time:                        09:29:22   Distribution:                  chi2(4)\n",
       "Cov. Estimator:            unadjusted                                         \n",
       "                                                                              \n",
       "                             Parameter Estimates                              \n",
@@ -1500,10 +1514,10 @@
    "execution_count": 27,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.676587Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.676153Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.686857Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.686281Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.553253Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.552871Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.563321Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.562674Z"
     }
    },
    "outputs": [
@@ -1515,7 +1529,7 @@
        "Statistic: 0.4435\n",
        "P-value: 0.5055\n",
        "Distributed: chi2(1)\n",
-       "WaldTestStatistic, id: 0x7f96042f1ed0"
+       "WaldTestStatistic, id: 0x7f0dd4314400"
       ]
      },
      "execution_count": 27,
@@ -1539,10 +1553,10 @@
    "execution_count": 28,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.688822Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.688629Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.698992Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.698441Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.565360Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.564998Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.574979Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.574310Z"
     }
    },
    "outputs": [],
@@ -1563,10 +1577,10 @@
    "execution_count": 29,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.701198Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.700679Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.704851Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.704333Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.577111Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.576887Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.581038Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.580378Z"
     }
    },
    "outputs": [
@@ -1597,10 +1611,10 @@
    "execution_count": 30,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.707027Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.706639Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.719024Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.718345Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.582879Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.582683Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.593908Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.593403Z"
     }
    },
    "outputs": [],
@@ -1621,10 +1635,10 @@
    "execution_count": 31,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.721559Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.721130Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.732819Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.732124Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.595698Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.595505Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.606095Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.605570Z"
     }
    },
    "outputs": [
@@ -1636,7 +1650,7 @@
        "Statistic: 1.0421\n",
        "P-value: 0.5939\n",
        "Distributed: chi2(2)\n",
-       "WaldTestStatistic, id: 0x7f96043d4130"
+       "WaldTestStatistic, id: 0x7f0dd442f730"
       ]
      },
      "execution_count": 31,
@@ -1660,10 +1674,10 @@
    "execution_count": 32,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.735207Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.734784Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.747139Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.746569Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.607848Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.607656Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.619068Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.618492Z"
     }
    },
    "outputs": [
@@ -1697,10 +1711,10 @@
    "execution_count": 33,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.749344Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.748954Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.804100Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.803375Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.621007Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.620790Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.673789Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.673144Z"
     }
    },
    "outputs": [
@@ -1743,13 +1757,7 @@
       "cgrant_1                 cgrant[t-1]\n",
       "chrsemp                  hrsemp - hrsemp[t-1]\n",
       "lhrsemp                 lhrsemp - lhrsemp[t-1]\n",
-      "\n"
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
+      "\n",
       "              year          fcode      employ         sales        avgsal  \\\n",
       "count   314.000000     314.000000  290.000000  2.450000e+02    267.000000   \n",
       "mean   1987.500000  415708.885350   56.903448  5.679815e+06  18326.284644   \n",
@@ -1812,10 +1820,10 @@
    "execution_count": 34,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.806258Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.806033Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.823468Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.822920Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.675823Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.675607Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.692921Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.692342Z"
     }
    },
    "outputs": [
@@ -1854,10 +1862,10 @@
    "execution_count": 35,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.825616Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.825401Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.838349Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.837774Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.694910Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.694709Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.707167Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.706618Z"
     }
    },
    "outputs": [
@@ -1871,7 +1879,7 @@
       "Estimator:                        OLS   Adj. R-squared:                 0.3255\n",
       "No. Observations:                  45   F-statistic:                    23.266\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000\n",
-      "Time:                        09:25:09   Distribution:                  chi2(1)\n",
+      "Time:                        09:29:22   Distribution:                  chi2(1)\n",
       "Cov. Estimator:            unadjusted                                         \n",
       "                                                                              \n",
       "                             Parameter Estimates                              \n",
@@ -1901,10 +1909,10 @@
    "execution_count": 36,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.840421Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.840215Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.856412Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.855843Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.709358Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.708979Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.724646Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.724102Z"
     }
    },
    "outputs": [
@@ -1918,7 +1926,7 @@
       "Estimator:                    IV-2SLS   Adj. R-squared:                -0.0070\n",
       "No. Observations:                  45   F-statistic:                    3.3464\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0674\n",
-      "Time:                        09:25:09   Distribution:                  chi2(1)\n",
+      "Time:                        09:29:22   Distribution:                  chi2(1)\n",
       "Cov. Estimator:            unadjusted                                         \n",
       "                                                                              \n",
       "                             Parameter Estimates                              \n",
@@ -1954,10 +1962,10 @@
    "execution_count": 37,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.858654Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.858243Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.878731Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.878124Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.726677Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.726314Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.745554Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.744876Z"
     }
    },
    "outputs": [
@@ -1986,14 +1994,7 @@
       "Instruments                                  grant\n",
       "--------------------------------------------------\n",
       "\n",
-      "T-stats reported in parentheses"
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "\n"
+      "T-stats reported in parentheses\n"
      ]
     }
    ],
@@ -2007,10 +2008,10 @@
    "execution_count": 38,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:09.881056Z",
-     "iopub.status.busy": "2024-09-24T09:25:09.880653Z",
-     "iopub.status.idle": "2024-09-24T09:25:09.904635Z",
-     "shell.execute_reply": "2024-09-24T09:25:09.903960Z"
+     "iopub.execute_input": "2024-09-24T09:29:22.747653Z",
+     "iopub.status.busy": "2024-09-24T09:29:22.747285Z",
+     "iopub.status.idle": "2024-09-24T09:29:22.769728Z",
+     "shell.execute_reply": "2024-09-24T09:29:22.769076Z"
     }
    },
    "outputs": [
diff --git a/devel/iv/examples/using-formulas.html b/devel/iv/examples/using-formulas.html
index 297a3c7a3c..9e31ca5326 100644
--- a/devel/iv/examples/using-formulas.html
+++ b/devel/iv/examples/using-formulas.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Using formulas to specify models - linearmodels v6.1 (+13)</title>
+        <title>Using formulas to specify models - linearmodels v6.1 (+15)</title>
       
     
 
@@ -94,7 +94,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -104,7 +104,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -191,10 +191,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
@@ -832,7 +832,7 @@ <h3 id="Estimating-a-model-with-a-formula">Estimating a model with a formula<a c
 Estimator:                    IV-2SLS   Adj. R-squared:                 0.0634
 No. Observations:               10089   F-statistic:                    2000.9
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000
-Time:                        09:25:13   Distribution:                  chi2(6)
+Time:                        09:29:26   Distribution:                  chi2(6)
 Cov. Estimator:                robust
 
                               Parameter Estimates
@@ -892,7 +892,7 @@ <h3 id="OLS">OLS<a class="headerlink" href="#OLS" title="Link to this heading">
 Estimator:                        OLS   Adj. R-squared:                 0.1765
 No. Observations:               10089   F-statistic:                    2262.6
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000
-Time:                        09:25:13   Distribution:                  chi2(6)
+Time:                        09:29:26   Distribution:                  chi2(6)
 Cov. Estimator:                robust
 
                               Parameter Estimates
diff --git a/devel/iv/examples/using-formulas.ipynb b/devel/iv/examples/using-formulas.ipynb
index 80d8b38340..36deb32cc1 100644
--- a/devel/iv/examples/using-formulas.ipynb
+++ b/devel/iv/examples/using-formulas.ipynb
@@ -71,10 +71,10 @@
    "execution_count": 1,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:12.241566Z",
-     "iopub.status.busy": "2024-09-24T09:25:12.241091Z",
-     "iopub.status.idle": "2024-09-24T09:25:12.998110Z",
-     "shell.execute_reply": "2024-09-24T09:25:12.997416Z"
+     "iopub.execute_input": "2024-09-24T09:29:25.206145Z",
+     "iopub.status.busy": "2024-09-24T09:29:25.205927Z",
+     "iopub.status.idle": "2024-09-24T09:29:25.980011Z",
+     "shell.execute_reply": "2024-09-24T09:29:25.979288Z"
     }
    },
    "outputs": [
@@ -140,10 +140,10 @@
    "execution_count": 2,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:13.000266Z",
-     "iopub.status.busy": "2024-09-24T09:25:12.999881Z",
-     "iopub.status.idle": "2024-09-24T09:25:13.023822Z",
-     "shell.execute_reply": "2024-09-24T09:25:13.023141Z"
+     "iopub.execute_input": "2024-09-24T09:29:25.982289Z",
+     "iopub.status.busy": "2024-09-24T09:29:25.982077Z",
+     "iopub.status.idle": "2024-09-24T09:29:26.006810Z",
+     "shell.execute_reply": "2024-09-24T09:29:26.006187Z"
     }
    },
    "outputs": [],
@@ -159,10 +159,10 @@
    "execution_count": 3,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:13.026146Z",
-     "iopub.status.busy": "2024-09-24T09:25:13.025748Z",
-     "iopub.status.idle": "2024-09-24T09:25:13.048766Z",
-     "shell.execute_reply": "2024-09-24T09:25:13.047797Z"
+     "iopub.execute_input": "2024-09-24T09:29:26.009568Z",
+     "iopub.status.busy": "2024-09-24T09:29:26.009060Z",
+     "iopub.status.idle": "2024-09-24T09:29:26.033808Z",
+     "shell.execute_reply": "2024-09-24T09:29:26.032752Z"
     }
    },
    "outputs": [
@@ -176,7 +176,7 @@
       "Estimator:                    IV-2SLS   Adj. R-squared:                 0.0634\n",
       "No. Observations:               10089   F-statistic:                    2000.9\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000\n",
-      "Time:                        09:25:13   Distribution:                  chi2(6)\n",
+      "Time:                        09:29:26   Distribution:                  chi2(6)\n",
       "Cov. Estimator:                robust                                         \n",
       "                                                                              \n",
       "                              Parameter Estimates                              \n",
@@ -218,10 +218,10 @@
    "execution_count": 4,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:13.051325Z",
-     "iopub.status.busy": "2024-09-24T09:25:13.051102Z",
-     "iopub.status.idle": "2024-09-24T09:25:13.096665Z",
-     "shell.execute_reply": "2024-09-24T09:25:13.095961Z"
+     "iopub.execute_input": "2024-09-24T09:29:26.036442Z",
+     "iopub.status.busy": "2024-09-24T09:29:26.036220Z",
+     "iopub.status.idle": "2024-09-24T09:29:26.080514Z",
+     "shell.execute_reply": "2024-09-24T09:29:26.079840Z"
     }
    },
    "outputs": [],
@@ -247,10 +247,10 @@
    "execution_count": 5,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:13.099908Z",
-     "iopub.status.busy": "2024-09-24T09:25:13.099548Z",
-     "iopub.status.idle": "2024-09-24T09:25:13.157786Z",
-     "shell.execute_reply": "2024-09-24T09:25:13.157142Z"
+     "iopub.execute_input": "2024-09-24T09:29:26.084402Z",
+     "iopub.status.busy": "2024-09-24T09:29:26.083524Z",
+     "iopub.status.idle": "2024-09-24T09:29:26.140994Z",
+     "shell.execute_reply": "2024-09-24T09:29:26.140433Z"
     }
    },
    "outputs": [
@@ -264,7 +264,7 @@
       "Estimator:                        OLS   Adj. R-squared:                 0.1765\n",
       "No. Observations:               10089   F-statistic:                    2262.6\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000\n",
-      "Time:                        09:25:13   Distribution:                  chi2(6)\n",
+      "Time:                        09:29:26   Distribution:                  chi2(6)\n",
       "Cov. Estimator:                robust                                         \n",
       "                                                                              \n",
       "                              Parameter Estimates                              \n",
@@ -303,10 +303,10 @@
    "execution_count": 6,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:13.160796Z",
-     "iopub.status.busy": "2024-09-24T09:25:13.160392Z",
-     "iopub.status.idle": "2024-09-24T09:25:13.178866Z",
-     "shell.execute_reply": "2024-09-24T09:25:13.178276Z"
+     "iopub.execute_input": "2024-09-24T09:29:26.143601Z",
+     "iopub.status.busy": "2024-09-24T09:29:26.143380Z",
+     "iopub.status.idle": "2024-09-24T09:29:26.162748Z",
+     "shell.execute_reply": "2024-09-24T09:29:26.162170Z"
     }
    },
    "outputs": [
diff --git a/devel/iv/index.html b/devel/iv/index.html
index 80bac07bc5..177765cfb5 100644
--- a/devel/iv/index.html
+++ b/devel/iv/index.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Instrumental Variable Estimation - linearmodels v6.1 (+13)</title>
+        <title>Instrumental Variable Estimation - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/introduction.html b/devel/iv/introduction.html
index 7e0b38b728..cd3f28dbfc 100644
--- a/devel/iv/introduction.html
+++ b/devel/iv/introduction.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Introduction - linearmodels v6.1 (+13)</title>
+        <title>Introduction - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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@@ -103,7 +103,7 @@
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@@ -15,7 +15,7 @@
     
   
       
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@@ -103,7 +103,7 @@
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.data.IVData.drop.html b/devel/iv/iv/linearmodels.iv.data.IVData.drop.html
index e45776b553..a34d5270a6 100644
--- a/devel/iv/iv/linearmodels.iv.data.IVData.drop.html
+++ b/devel/iv/iv/linearmodels.iv.data.IVData.drop.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.data.IVData.drop - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.data.IVData.drop - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.data.IVData.html b/devel/iv/iv/linearmodels.iv.data.IVData.html
index 10f51adc2f..7a320f1c08 100644
--- a/devel/iv/iv/linearmodels.iv.data.IVData.html
+++ b/devel/iv/iv/linearmodels.iv.data.IVData.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.data.IVData - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.data.IVData - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.data.IVData.isnull.html b/devel/iv/iv/linearmodels.iv.data.IVData.isnull.html
index 5536b7e824..717a883f5b 100644
--- a/devel/iv/iv/linearmodels.iv.data.IVData.isnull.html
+++ b/devel/iv/iv/linearmodels.iv.data.IVData.isnull.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.data.IVData.isnull - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.data.IVData.isnull - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.data.IVData.labels.html b/devel/iv/iv/linearmodels.iv.data.IVData.labels.html
index 1218642f3f..9f617fd437 100644
--- a/devel/iv/iv/linearmodels.iv.data.IVData.labels.html
+++ b/devel/iv/iv/linearmodels.iv.data.IVData.labels.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.data.IVData.labels - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.data.IVData.labels - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.data.IVData.ndarray.html b/devel/iv/iv/linearmodels.iv.data.IVData.ndarray.html
index 0d73e6f195..2cb404326e 100644
--- a/devel/iv/iv/linearmodels.iv.data.IVData.ndarray.html
+++ b/devel/iv/iv/linearmodels.iv.data.IVData.ndarray.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.data.IVData.ndarray - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.data.IVData.ndarray - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.data.IVData.ndim.html b/devel/iv/iv/linearmodels.iv.data.IVData.ndim.html
index 53cdf9986a..7d2f6892bb 100644
--- a/devel/iv/iv/linearmodels.iv.data.IVData.ndim.html
+++ b/devel/iv/iv/linearmodels.iv.data.IVData.ndim.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.data.IVData.ndim - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.data.IVData.ndim - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.data.IVData.pandas.html b/devel/iv/iv/linearmodels.iv.data.IVData.pandas.html
index e9af6d7951..c78be823d4 100644
--- a/devel/iv/iv/linearmodels.iv.data.IVData.pandas.html
+++ b/devel/iv/iv/linearmodels.iv.data.IVData.pandas.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.data.IVData.pandas - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.data.IVData.pandas - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.data.IVData.rows.html b/devel/iv/iv/linearmodels.iv.data.IVData.rows.html
index cbe45b2112..324178a587 100644
--- a/devel/iv/iv/linearmodels.iv.data.IVData.rows.html
+++ b/devel/iv/iv/linearmodels.iv.data.IVData.rows.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.data.IVData.rows - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.data.IVData.rows - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.data.IVData.shape.html b/devel/iv/iv/linearmodels.iv.data.IVData.shape.html
index 95d98d375c..6126e316ed 100644
--- a/devel/iv/iv/linearmodels.iv.data.IVData.shape.html
+++ b/devel/iv/iv/linearmodels.iv.data.IVData.shape.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.data.IVData.shape - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.data.IVData.shape - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.gmm.HeteroskedasticWeightMatrix.config.html b/devel/iv/iv/linearmodels.iv.gmm.HeteroskedasticWeightMatrix.config.html
index f5920bc8be..0e699f73fd 100644
--- a/devel/iv/iv/linearmodels.iv.gmm.HeteroskedasticWeightMatrix.config.html
+++ b/devel/iv/iv/linearmodels.iv.gmm.HeteroskedasticWeightMatrix.config.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.gmm.HeteroskedasticWeightMatrix.config - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.gmm.HeteroskedasticWeightMatrix.config - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.gmm.HeteroskedasticWeightMatrix.weight_matrix - linearmodels v6.1 (+15)</title>
       
     
 
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@@ -103,7 +103,7 @@
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+            linearmodels v6.1 (+15)
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.gmm.HomoskedasticWeightMatrix.config.html b/devel/iv/iv/linearmodels.iv.gmm.HomoskedasticWeightMatrix.config.html
index a31acd1dc7..8e102fc9ed 100644
--- a/devel/iv/iv/linearmodels.iv.gmm.HomoskedasticWeightMatrix.config.html
+++ b/devel/iv/iv/linearmodels.iv.gmm.HomoskedasticWeightMatrix.config.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.gmm.HomoskedasticWeightMatrix.config - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.gmm.HomoskedasticWeightMatrix.config - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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+            linearmodels v6.1 (+15)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.gmm.HomoskedasticWeightMatrix.html b/devel/iv/iv/linearmodels.iv.gmm.HomoskedasticWeightMatrix.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.gmm.HomoskedasticWeightMatrix - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.gmm.HomoskedasticWeightMatrix - linearmodels v6.1 (+15)</title>
       
     
 
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.gmm.HomoskedasticWeightMatrix.weight_matrix.html b/devel/iv/iv/linearmodels.iv.gmm.HomoskedasticWeightMatrix.weight_matrix.html
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--- a/devel/iv/iv/linearmodels.iv.gmm.HomoskedasticWeightMatrix.weight_matrix.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.gmm.HomoskedasticWeightMatrix.weight_matrix - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.gmm.HomoskedasticWeightMatrix.weight_matrix - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.gmm.IVGMMCovariance.config.html b/devel/iv/iv/linearmodels.iv.gmm.IVGMMCovariance.config.html
index a05aa84708..e563bbbb4d 100644
--- a/devel/iv/iv/linearmodels.iv.gmm.IVGMMCovariance.config.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.gmm.IVGMMCovariance.config - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.gmm.IVGMMCovariance.config - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.gmm.IVGMMCovariance.cov.html b/devel/iv/iv/linearmodels.iv.gmm.IVGMMCovariance.cov.html
index a73d55044c..0bfdd524aa 100644
--- a/devel/iv/iv/linearmodels.iv.gmm.IVGMMCovariance.cov.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.gmm.IVGMMCovariance.cov - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.gmm.IVGMMCovariance.cov - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.gmm.IVGMMCovariance.debiased.html b/devel/iv/iv/linearmodels.iv.gmm.IVGMMCovariance.debiased.html
index 5844eaff7b..efaa168ce3 100644
--- a/devel/iv/iv/linearmodels.iv.gmm.IVGMMCovariance.debiased.html
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.gmm.IVGMMCovariance.debiased - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.gmm.IVGMMCovariance.html b/devel/iv/iv/linearmodels.iv.gmm.IVGMMCovariance.html
index d44faf2e78..6de5566531 100644
--- a/devel/iv/iv/linearmodels.iv.gmm.IVGMMCovariance.html
+++ b/devel/iv/iv/linearmodels.iv.gmm.IVGMMCovariance.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.gmm.IVGMMCovariance - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.gmm.IVGMMCovariance - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.gmm.IVGMMCovariance.s.html b/devel/iv/iv/linearmodels.iv.gmm.IVGMMCovariance.s.html
index edda0b3024..3a2970e47a 100644
--- a/devel/iv/iv/linearmodels.iv.gmm.IVGMMCovariance.s.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.gmm.IVGMMCovariance.s - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.gmm.IVGMMCovariance.s - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.gmm.IVGMMCovariance.s2.html b/devel/iv/iv/linearmodels.iv.gmm.IVGMMCovariance.s2.html
index dfd0bcbca4..d939eb2131 100644
--- a/devel/iv/iv/linearmodels.iv.gmm.IVGMMCovariance.s2.html
+++ b/devel/iv/iv/linearmodels.iv.gmm.IVGMMCovariance.s2.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.gmm.IVGMMCovariance.s2 - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.gmm.IVGMMCovariance.s2 - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.gmm.KernelWeightMatrix.bandwidth.html b/devel/iv/iv/linearmodels.iv.gmm.KernelWeightMatrix.bandwidth.html
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--- a/devel/iv/iv/linearmodels.iv.gmm.KernelWeightMatrix.bandwidth.html
+++ b/devel/iv/iv/linearmodels.iv.gmm.KernelWeightMatrix.bandwidth.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.gmm.KernelWeightMatrix.bandwidth - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.gmm.KernelWeightMatrix.bandwidth - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.gmm.KernelWeightMatrix.config.html b/devel/iv/iv/linearmodels.iv.gmm.KernelWeightMatrix.config.html
index 2d920f1297..45a62b174b 100644
--- a/devel/iv/iv/linearmodels.iv.gmm.KernelWeightMatrix.config.html
+++ b/devel/iv/iv/linearmodels.iv.gmm.KernelWeightMatrix.config.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.gmm.KernelWeightMatrix.config - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.gmm.KernelWeightMatrix.config - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.gmm.KernelWeightMatrix.html b/devel/iv/iv/linearmodels.iv.gmm.KernelWeightMatrix.html
index 3ace14a7bd..e39a789529 100644
--- a/devel/iv/iv/linearmodels.iv.gmm.KernelWeightMatrix.html
+++ b/devel/iv/iv/linearmodels.iv.gmm.KernelWeightMatrix.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.gmm.KernelWeightMatrix - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.gmm.KernelWeightMatrix - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.gmm.KernelWeightMatrix.weight_matrix.html b/devel/iv/iv/linearmodels.iv.gmm.KernelWeightMatrix.weight_matrix.html
index 6d3fcbe5c2..c8b1d5656d 100644
--- a/devel/iv/iv/linearmodels.iv.gmm.KernelWeightMatrix.weight_matrix.html
+++ b/devel/iv/iv/linearmodels.iv.gmm.KernelWeightMatrix.weight_matrix.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.gmm.KernelWeightMatrix.weight_matrix - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.gmm.KernelWeightMatrix.weight_matrix - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.gmm.OneWayClusteredWeightMatrix.config.html b/devel/iv/iv/linearmodels.iv.gmm.OneWayClusteredWeightMatrix.config.html
index af2da19020..0a42fa9e1d 100644
--- a/devel/iv/iv/linearmodels.iv.gmm.OneWayClusteredWeightMatrix.config.html
+++ b/devel/iv/iv/linearmodels.iv.gmm.OneWayClusteredWeightMatrix.config.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.gmm.OneWayClusteredWeightMatrix.config - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.gmm.OneWayClusteredWeightMatrix.config - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.gmm.OneWayClusteredWeightMatrix.html b/devel/iv/iv/linearmodels.iv.gmm.OneWayClusteredWeightMatrix.html
index 2a2b2b39ef..b4ac01a87d 100644
--- a/devel/iv/iv/linearmodels.iv.gmm.OneWayClusteredWeightMatrix.html
+++ b/devel/iv/iv/linearmodels.iv.gmm.OneWayClusteredWeightMatrix.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.gmm.OneWayClusteredWeightMatrix - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.gmm.OneWayClusteredWeightMatrix - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.gmm.OneWayClusteredWeightMatrix.weight_matrix.html b/devel/iv/iv/linearmodels.iv.gmm.OneWayClusteredWeightMatrix.weight_matrix.html
index 30b12099ba..4bbe82245c 100644
--- a/devel/iv/iv/linearmodels.iv.gmm.OneWayClusteredWeightMatrix.weight_matrix.html
+++ b/devel/iv/iv/linearmodels.iv.gmm.OneWayClusteredWeightMatrix.weight_matrix.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.gmm.OneWayClusteredWeightMatrix.weight_matrix - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.gmm.OneWayClusteredWeightMatrix.weight_matrix - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.model.IV2SLS.estimate_parameters.html b/devel/iv/iv/linearmodels.iv.model.IV2SLS.estimate_parameters.html
index 6c172466f7..f2074821c9 100644
--- a/devel/iv/iv/linearmodels.iv.model.IV2SLS.estimate_parameters.html
+++ b/devel/iv/iv/linearmodels.iv.model.IV2SLS.estimate_parameters.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.model.IV2SLS.estimate_parameters - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.model.IV2SLS.estimate_parameters - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.model.IV2SLS.fit.html b/devel/iv/iv/linearmodels.iv.model.IV2SLS.fit.html
index 1168912b11..dfd4ef6c13 100644
--- a/devel/iv/iv/linearmodels.iv.model.IV2SLS.fit.html
+++ b/devel/iv/iv/linearmodels.iv.model.IV2SLS.fit.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.model.IV2SLS.fit - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.model.IV2SLS.fit - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
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+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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-    linearmodels v6.1 (+13)
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@@ -93,7 +93,7 @@
 
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-            linearmodels v6.1 (+13)
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+    linearmodels v6.1 (+15)
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+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.results.IVGMMResults.conf_int - linearmodels v6.1 (+15)</title>
       
     
 
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+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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+++ b/devel/iv/iv/linearmodels.iv.results.IVGMMResults.cov.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVGMMResults.cov - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVGMMResults.cov - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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+            linearmodels v6.1 (+15)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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--- a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.cov_config.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVGMMResults.cov_config.html
@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.results.IVGMMResults.cov_config - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.results.IVGMMResults.cov_estimator - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.debiased.html b/devel/iv/iv/linearmodels.iv.results.IVGMMResults.debiased.html
index a3ecf07335..178a59f19e 100644
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@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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+        <title>linearmodels.iv.results.IVGMMResults.df_model - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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index e5cb1a74fd..bf1020f5ae 100644
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+        <title>linearmodels.iv.results.IVGMMResults.df_resid - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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index 93abea1955..ee4099a7f1 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.f_statistic.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVGMMResults.f_statistic - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVGMMResults.f_statistic - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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index b14f9024f5..6d59386fe1 100644
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.results.IVGMMResults.first_stage - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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+            linearmodels v6.1 (+15)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.html b/devel/iv/iv/linearmodels.iv.results.IVGMMResults.html
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--- a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.html
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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+            linearmodels v6.1 (+15)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.nobs.html b/devel/iv/iv/linearmodels.iv.results.IVGMMResults.nobs.html
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@@ -93,7 +93,7 @@
 
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       <img src="../../_static/bw-logo.svg" alt="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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index 1a11996fbb..ec1f9aa3ac 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.params.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVGMMResults.params.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVGMMResults.params - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVGMMResults.params - linearmodels v6.1 (+15)</title>
       
     
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.predict.html b/devel/iv/iv/linearmodels.iv.results.IVGMMResults.predict.html
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--- a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.predict.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVGMMResults.predict.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVGMMResults.predict - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVGMMResults.predict - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.pvalues.html b/devel/iv/iv/linearmodels.iv.results.IVGMMResults.pvalues.html
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--- a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.pvalues.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVGMMResults.pvalues.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVGMMResults.pvalues - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVGMMResults.pvalues - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.resid_ss.html b/devel/iv/iv/linearmodels.iv.results.IVGMMResults.resid_ss.html
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--- a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.resid_ss.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVGMMResults.resid_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVGMMResults.resid_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVGMMResults.resid_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.resids.html b/devel/iv/iv/linearmodels.iv.results.IVGMMResults.resids.html
index ee47494eb0..61c866fd0d 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.resids.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVGMMResults.resids.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVGMMResults.resids - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVGMMResults.resids - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.rsquared.html b/devel/iv/iv/linearmodels.iv.results.IVGMMResults.rsquared.html
index 67d875c915..091780319c 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.rsquared.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVGMMResults.rsquared.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVGMMResults.rsquared - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVGMMResults.rsquared - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.rsquared_adj.html b/devel/iv/iv/linearmodels.iv.results.IVGMMResults.rsquared_adj.html
index 044439ab1e..d10e23bb2f 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.rsquared_adj.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVGMMResults.rsquared_adj.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVGMMResults.rsquared_adj - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVGMMResults.rsquared_adj - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.s2.html b/devel/iv/iv/linearmodels.iv.results.IVGMMResults.s2.html
index 4d839a8d5d..fb6c1f2690 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.s2.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVGMMResults.s2.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVGMMResults.s2 - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVGMMResults.s2 - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.std_errors.html b/devel/iv/iv/linearmodels.iv.results.IVGMMResults.std_errors.html
index 7359415ff0..a2816c042f 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.std_errors.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVGMMResults.std_errors.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVGMMResults.std_errors - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVGMMResults.std_errors - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.summary.html b/devel/iv/iv/linearmodels.iv.results.IVGMMResults.summary.html
index 1719514e77..e587f2b04b 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.summary.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVGMMResults.summary.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVGMMResults.summary - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVGMMResults.summary - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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--- a/devel/iv/iv/linearmodels.iv.results.IVGMMResults.total_ss.html
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.results.IVGMMResults.total_ss - linearmodels v6.1 (+15)</title>
       
     
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.results.IVGMMResults.tstats - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.results.IVGMMResults.wald_test - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.results.IVGMMResults.weight_config - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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index 4b38262faa..dd3298865c 100644
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.results.IVModelComparison.cov_estimator - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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index d2136503d7..4ad99a135b 100644
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.results.IVModelComparison.f_statistic.html b/devel/iv/iv/linearmodels.iv.results.IVModelComparison.f_statistic.html
index d8baeeabbb..52092f4839 100644
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.results.IVModelComparison.f_statistic - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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+++ b/devel/iv/iv/linearmodels.iv.results.IVModelComparison.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVModelComparison - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVModelComparison - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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--- a/devel/iv/iv/linearmodels.iv.results.IVModelComparison.nobs.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVModelComparison.nobs.html
@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.results.IVModelComparison.nobs - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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--- a/devel/iv/iv/linearmodels.iv.results.IVModelComparison.params.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVModelComparison.params - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVModelComparison.params - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.results.IVModelComparison.pvalues.html b/devel/iv/iv/linearmodels.iv.results.IVModelComparison.pvalues.html
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.results.IVModelComparison.pvalues - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.results.IVModelComparison.rsquared.html b/devel/iv/iv/linearmodels.iv.results.IVModelComparison.rsquared.html
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--- a/devel/iv/iv/linearmodels.iv.results.IVModelComparison.rsquared.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVModelComparison.rsquared - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVModelComparison.rsquared - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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--- a/devel/iv/iv/linearmodels.iv.results.IVModelComparison.rsquared_adj.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVModelComparison.rsquared_adj - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVModelComparison.rsquared_adj - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.results.IVModelComparison.std_errors.html b/devel/iv/iv/linearmodels.iv.results.IVModelComparison.std_errors.html
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+        <title>linearmodels.iv.results.IVModelComparison.std_errors - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.results.IVModelComparison.summary.html b/devel/iv/iv/linearmodels.iv.results.IVModelComparison.summary.html
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.results.IVModelComparison.summary - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.results.IVModelComparison.tstats.html b/devel/iv/iv/linearmodels.iv.results.IVModelComparison.tstats.html
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.results.IVModelComparison.tstats - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.anderson_rubin.html b/devel/iv/iv/linearmodels.iv.results.IVResults.anderson_rubin.html
index 3ab0d14804..5b15e601dd 100644
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.basmann.html b/devel/iv/iv/linearmodels.iv.results.IVResults.basmann.html
index 705df94af3..39b1e320a3 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.basmann.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.basmann.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.basmann - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.basmann - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
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@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.basmann_f.html b/devel/iv/iv/linearmodels.iv.results.IVResults.basmann_f.html
index 8a81099433..7172fafa84 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.basmann_f.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.basmann_f.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.basmann_f - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.basmann_f - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.conf_int.html b/devel/iv/iv/linearmodels.iv.results.IVResults.conf_int.html
index 172f4b960b..2f8a23f9bd 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.conf_int.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.conf_int.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.conf_int - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.conf_int - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.cov.html b/devel/iv/iv/linearmodels.iv.results.IVResults.cov.html
index 0a5d807d64..8551b1016f 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.cov.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.cov.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.cov - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.cov - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.cov_config.html b/devel/iv/iv/linearmodels.iv.results.IVResults.cov_config.html
index 5ab14528c1..87f2bcd00f 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.cov_config.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.cov_config.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.cov_config - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.cov_config - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.cov_estimator.html b/devel/iv/iv/linearmodels.iv.results.IVResults.cov_estimator.html
index fa740ea08c..ec76e5d1cc 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.cov_estimator.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.cov_estimator.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.cov_estimator - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.cov_estimator - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.cov_type.html b/devel/iv/iv/linearmodels.iv.results.IVResults.cov_type.html
index f1309d11b5..a19c5b2040 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.cov_type.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.cov_type.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.cov_type - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.cov_type - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.debiased.html b/devel/iv/iv/linearmodels.iv.results.IVResults.debiased.html
index 9724846106..d0ea323e7a 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.debiased.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.debiased.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.debiased - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.debiased - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.df_model.html b/devel/iv/iv/linearmodels.iv.results.IVResults.df_model.html
index 14c9b56b8c..68a57ca237 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.df_model.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.df_model.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.df_model - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.df_model - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.df_resid.html b/devel/iv/iv/linearmodels.iv.results.IVResults.df_resid.html
index 5f2f28e2f1..a6ebac7bfc 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.df_resid.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.df_resid.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.df_resid - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.df_resid - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.durbin.html b/devel/iv/iv/linearmodels.iv.results.IVResults.durbin.html
index 266bac2fd0..cbf7af93b8 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.durbin.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.durbin.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.durbin - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.durbin - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.f_statistic.html b/devel/iv/iv/linearmodels.iv.results.IVResults.f_statistic.html
index 5d2a549b1b..a968520d91 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.f_statistic.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.f_statistic.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.f_statistic - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.f_statistic - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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@@ -190,10 +190,10 @@
 
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   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.first_stage.html b/devel/iv/iv/linearmodels.iv.results.IVResults.first_stage.html
index 4c2aaaabee..5622ed5094 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.first_stage.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.first_stage.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.first_stage - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.first_stage - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.fitted_values.html b/devel/iv/iv/linearmodels.iv.results.IVResults.fitted_values.html
index 2bf95dd54c..dc7942f8ce 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.fitted_values.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.fitted_values.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.fitted_values - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.fitted_values - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.has_constant.html b/devel/iv/iv/linearmodels.iv.results.IVResults.has_constant.html
index 2999db7c59..45e4673811 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.has_constant.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.has_constant.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.has_constant - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.has_constant - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.html b/devel/iv/iv/linearmodels.iv.results.IVResults.html
index 1cd8f3df24..65b6512ea8 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.idiosyncratic.html b/devel/iv/iv/linearmodels.iv.results.IVResults.idiosyncratic.html
index a1db2c0dc7..0ebc59426d 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.idiosyncratic.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.idiosyncratic.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.idiosyncratic - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.idiosyncratic - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.kappa.html b/devel/iv/iv/linearmodels.iv.results.IVResults.kappa.html
index 3e602e8b49..0e08c25f19 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.kappa.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.kappa.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.kappa - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.kappa - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.method.html b/devel/iv/iv/linearmodels.iv.results.IVResults.method.html
index b6d620da31..765ba13b26 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.method.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.method.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.method - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.method - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.model_ss.html b/devel/iv/iv/linearmodels.iv.results.IVResults.model_ss.html
index f557e914e1..bd4bef267b 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.model_ss.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.model_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.model_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.model_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.nobs.html b/devel/iv/iv/linearmodels.iv.results.IVResults.nobs.html
index 7bf3812f9c..957e9f5c7d 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.nobs.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.nobs.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.nobs - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.nobs - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.params.html b/devel/iv/iv/linearmodels.iv.results.IVResults.params.html
index c008d19e45..2a9db83e50 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.params.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.params.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.params - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.params - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.predict.html b/devel/iv/iv/linearmodels.iv.results.IVResults.predict.html
index 84a8f81e68..e81a5f5600 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.predict.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.predict.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.predict - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.predict - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.pvalues.html b/devel/iv/iv/linearmodels.iv.results.IVResults.pvalues.html
index 6ce8022898..7f179600b7 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.pvalues.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.pvalues.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.pvalues - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.pvalues - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.resid_ss.html b/devel/iv/iv/linearmodels.iv.results.IVResults.resid_ss.html
index 8a2c11839d..158ea52cbc 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.resid_ss.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.resid_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.resid_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.resid_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.resids.html b/devel/iv/iv/linearmodels.iv.results.IVResults.resids.html
index 4d22116465..bde6ece554 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.resids.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.resids.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.resids - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.resids - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.rsquared.html b/devel/iv/iv/linearmodels.iv.results.IVResults.rsquared.html
index cccb5f7ed8..056800fca8 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.rsquared.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.rsquared.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.rsquared - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.rsquared - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.rsquared_adj.html b/devel/iv/iv/linearmodels.iv.results.IVResults.rsquared_adj.html
index c0c47c691f..06eb70ffb9 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.rsquared_adj.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.rsquared_adj.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.rsquared_adj - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.rsquared_adj - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.s2.html b/devel/iv/iv/linearmodels.iv.results.IVResults.s2.html
index d64e150292..e03749b04c 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.s2.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.s2.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.s2 - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.s2 - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.sargan.html b/devel/iv/iv/linearmodels.iv.results.IVResults.sargan.html
index 693ded1fef..e9f68d975a 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.sargan.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.sargan.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.sargan - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.sargan - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.std_errors.html b/devel/iv/iv/linearmodels.iv.results.IVResults.std_errors.html
index 1c2efeab16..3e82e82423 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.std_errors.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.std_errors.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.std_errors - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.std_errors - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.summary.html b/devel/iv/iv/linearmodels.iv.results.IVResults.summary.html
index 54e16771a5..a28dbffa12 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.summary.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.summary.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.summary - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.summary - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.total_ss.html b/devel/iv/iv/linearmodels.iv.results.IVResults.total_ss.html
index bf767c11ee..ee4628f7a5 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.total_ss.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.total_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.total_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.total_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.tstats.html b/devel/iv/iv/linearmodels.iv.results.IVResults.tstats.html
index 9615410ad5..33fc604e33 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.tstats.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.tstats.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.tstats - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.tstats - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.wald_test.html b/devel/iv/iv/linearmodels.iv.results.IVResults.wald_test.html
index f3ace937a9..b7fe2ff920 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.wald_test.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.wald_test.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.wald_test - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.wald_test - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.wooldridge_overid.html b/devel/iv/iv/linearmodels.iv.results.IVResults.wooldridge_overid.html
index 54ffc1a69b..f2c9b53fcc 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.wooldridge_overid.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.wooldridge_overid.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.wooldridge_overid - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.wooldridge_overid - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.wooldridge_regression.html b/devel/iv/iv/linearmodels.iv.results.IVResults.wooldridge_regression.html
index 9cd33e53d8..7953958492 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.wooldridge_regression.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.wooldridge_regression.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.wooldridge_regression - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.wooldridge_regression - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.wooldridge_score.html b/devel/iv/iv/linearmodels.iv.results.IVResults.wooldridge_score.html
index 0e72a56db0..d1a0257ce0 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.wooldridge_score.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.wooldridge_score.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.wooldridge_score - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.wooldridge_score - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.wresids.html b/devel/iv/iv/linearmodels.iv.results.IVResults.wresids.html
index 157aee61a5..6a6ea91deb 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.wresids.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.wresids.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.wresids - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.wresids - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.IVResults.wu_hausman.html b/devel/iv/iv/linearmodels.iv.results.IVResults.wu_hausman.html
index a1223c5e28..fb4d4a2a39 100644
--- a/devel/iv/iv/linearmodels.iv.results.IVResults.wu_hausman.html
+++ b/devel/iv/iv/linearmodels.iv.results.IVResults.wu_hausman.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.IVResults.wu_hausman - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.IVResults.wu_hausman - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/iv/iv/linearmodels.iv.results.OLSResults.conf_int.html b/devel/iv/iv/linearmodels.iv.results.OLSResults.conf_int.html
index a0970ed7de..6d45d0f57f 100644
--- a/devel/iv/iv/linearmodels.iv.results.OLSResults.conf_int.html
+++ b/devel/iv/iv/linearmodels.iv.results.OLSResults.conf_int.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.OLSResults.conf_int - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.OLSResults.conf_int - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.OLSResults.cov.html b/devel/iv/iv/linearmodels.iv.results.OLSResults.cov.html
index e27758e5c4..4f83751c33 100644
--- a/devel/iv/iv/linearmodels.iv.results.OLSResults.cov.html
+++ b/devel/iv/iv/linearmodels.iv.results.OLSResults.cov.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.OLSResults.cov - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.OLSResults.cov - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.OLSResults.cov_config.html b/devel/iv/iv/linearmodels.iv.results.OLSResults.cov_config.html
index 4747c50bbe..3b8b10e02d 100644
--- a/devel/iv/iv/linearmodels.iv.results.OLSResults.cov_config.html
+++ b/devel/iv/iv/linearmodels.iv.results.OLSResults.cov_config.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.OLSResults.cov_config - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.OLSResults.cov_config - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.OLSResults.cov_estimator.html b/devel/iv/iv/linearmodels.iv.results.OLSResults.cov_estimator.html
index c4c2744260..30b652f50d 100644
--- a/devel/iv/iv/linearmodels.iv.results.OLSResults.cov_estimator.html
+++ b/devel/iv/iv/linearmodels.iv.results.OLSResults.cov_estimator.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.OLSResults.cov_estimator - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.OLSResults.cov_estimator - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.OLSResults.cov_type.html b/devel/iv/iv/linearmodels.iv.results.OLSResults.cov_type.html
index b611f45e89..2f81b918ba 100644
--- a/devel/iv/iv/linearmodels.iv.results.OLSResults.cov_type.html
+++ b/devel/iv/iv/linearmodels.iv.results.OLSResults.cov_type.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.OLSResults.cov_type - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.OLSResults.cov_type - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.OLSResults.debiased.html b/devel/iv/iv/linearmodels.iv.results.OLSResults.debiased.html
index 8568b1d453..2e181e20ae 100644
--- a/devel/iv/iv/linearmodels.iv.results.OLSResults.debiased.html
+++ b/devel/iv/iv/linearmodels.iv.results.OLSResults.debiased.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.OLSResults.debiased - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.OLSResults.debiased - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.OLSResults.df_model.html b/devel/iv/iv/linearmodels.iv.results.OLSResults.df_model.html
index 65a9ca6cc2..0a91bb6503 100644
--- a/devel/iv/iv/linearmodels.iv.results.OLSResults.df_model.html
+++ b/devel/iv/iv/linearmodels.iv.results.OLSResults.df_model.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.OLSResults.df_model - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.OLSResults.df_model - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.OLSResults.df_resid.html b/devel/iv/iv/linearmodels.iv.results.OLSResults.df_resid.html
index c89ae8ae61..2b096673a2 100644
--- a/devel/iv/iv/linearmodels.iv.results.OLSResults.df_resid.html
+++ b/devel/iv/iv/linearmodels.iv.results.OLSResults.df_resid.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.OLSResults.df_resid - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.OLSResults.df_resid - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.OLSResults.f_statistic.html b/devel/iv/iv/linearmodels.iv.results.OLSResults.f_statistic.html
index 5d30d44cbf..9da3985441 100644
--- a/devel/iv/iv/linearmodels.iv.results.OLSResults.f_statistic.html
+++ b/devel/iv/iv/linearmodels.iv.results.OLSResults.f_statistic.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.OLSResults.f_statistic - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.OLSResults.f_statistic - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.OLSResults.fitted_values.html b/devel/iv/iv/linearmodels.iv.results.OLSResults.fitted_values.html
index 2436bacdeb..14927bce09 100644
--- a/devel/iv/iv/linearmodels.iv.results.OLSResults.fitted_values.html
+++ b/devel/iv/iv/linearmodels.iv.results.OLSResults.fitted_values.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.OLSResults.fitted_values - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.OLSResults.fitted_values - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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+++ b/devel/iv/iv/linearmodels.iv.results.OLSResults.has_constant.html
@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.results.OLSResults.has_constant - linearmodels v6.1 (+15)</title>
       
     
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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--- a/devel/iv/iv/linearmodels.iv.results.OLSResults.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.OLSResults - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.OLSResults - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.iv.results.OLSResults.idiosyncratic - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.OLSResults.resid_ss.html b/devel/iv/iv/linearmodels.iv.results.OLSResults.resid_ss.html
index 0276d60b50..21c2b3a022 100644
--- a/devel/iv/iv/linearmodels.iv.results.OLSResults.resid_ss.html
+++ b/devel/iv/iv/linearmodels.iv.results.OLSResults.resid_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.OLSResults.resid_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.OLSResults.resid_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.OLSResults.resids.html b/devel/iv/iv/linearmodels.iv.results.OLSResults.resids.html
index e5a40a75ab..34e09f6b15 100644
--- a/devel/iv/iv/linearmodels.iv.results.OLSResults.resids.html
+++ b/devel/iv/iv/linearmodels.iv.results.OLSResults.resids.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.OLSResults.resids - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.OLSResults.resids - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.OLSResults.rsquared.html b/devel/iv/iv/linearmodels.iv.results.OLSResults.rsquared.html
index dbf2a4c623..6877099515 100644
--- a/devel/iv/iv/linearmodels.iv.results.OLSResults.rsquared.html
+++ b/devel/iv/iv/linearmodels.iv.results.OLSResults.rsquared.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.OLSResults.rsquared - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.OLSResults.rsquared - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.OLSResults.rsquared_adj.html b/devel/iv/iv/linearmodels.iv.results.OLSResults.rsquared_adj.html
index f9b695ea8f..86f65e716f 100644
--- a/devel/iv/iv/linearmodels.iv.results.OLSResults.rsquared_adj.html
+++ b/devel/iv/iv/linearmodels.iv.results.OLSResults.rsquared_adj.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.OLSResults.rsquared_adj - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.OLSResults.rsquared_adj - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.OLSResults.s2.html b/devel/iv/iv/linearmodels.iv.results.OLSResults.s2.html
index f0df90038b..3a228e853d 100644
--- a/devel/iv/iv/linearmodels.iv.results.OLSResults.s2.html
+++ b/devel/iv/iv/linearmodels.iv.results.OLSResults.s2.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.OLSResults.s2 - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.OLSResults.s2 - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.OLSResults.std_errors.html b/devel/iv/iv/linearmodels.iv.results.OLSResults.std_errors.html
index e871c2971d..38e4647f83 100644
--- a/devel/iv/iv/linearmodels.iv.results.OLSResults.std_errors.html
+++ b/devel/iv/iv/linearmodels.iv.results.OLSResults.std_errors.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.OLSResults.std_errors - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.OLSResults.std_errors - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.OLSResults.summary.html b/devel/iv/iv/linearmodels.iv.results.OLSResults.summary.html
index f368b41628..aaf8e8246a 100644
--- a/devel/iv/iv/linearmodels.iv.results.OLSResults.summary.html
+++ b/devel/iv/iv/linearmodels.iv.results.OLSResults.summary.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.OLSResults.summary - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.OLSResults.summary - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.OLSResults.total_ss.html b/devel/iv/iv/linearmodels.iv.results.OLSResults.total_ss.html
index 85c262d114..805a7be1b7 100644
--- a/devel/iv/iv/linearmodels.iv.results.OLSResults.total_ss.html
+++ b/devel/iv/iv/linearmodels.iv.results.OLSResults.total_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.OLSResults.total_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.OLSResults.total_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.OLSResults.tstats.html b/devel/iv/iv/linearmodels.iv.results.OLSResults.tstats.html
index c28a1ab140..f1548895c6 100644
--- a/devel/iv/iv/linearmodels.iv.results.OLSResults.tstats.html
+++ b/devel/iv/iv/linearmodels.iv.results.OLSResults.tstats.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.OLSResults.tstats - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.OLSResults.tstats - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.OLSResults.wald_test.html b/devel/iv/iv/linearmodels.iv.results.OLSResults.wald_test.html
index c055a077b9..617fbc3aa9 100644
--- a/devel/iv/iv/linearmodels.iv.results.OLSResults.wald_test.html
+++ b/devel/iv/iv/linearmodels.iv.results.OLSResults.wald_test.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.OLSResults.wald_test - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.OLSResults.wald_test - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.OLSResults.wresids.html b/devel/iv/iv/linearmodels.iv.results.OLSResults.wresids.html
index 3231ffe6df..05d4f692ba 100644
--- a/devel/iv/iv/linearmodels.iv.results.OLSResults.wresids.html
+++ b/devel/iv/iv/linearmodels.iv.results.OLSResults.wresids.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.OLSResults.wresids - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.OLSResults.wresids - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/iv/linearmodels.iv.results.compare.html b/devel/iv/iv/linearmodels.iv.results.compare.html
index ce0ad3a8ad..6d2c8406f2 100644
--- a/devel/iv/iv/linearmodels.iv.results.compare.html
+++ b/devel/iv/iv/linearmodels.iv.results.compare.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.iv.results.compare - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.iv.results.compare - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/mathematical-formula.html b/devel/iv/mathematical-formula.html
index 2dc5917b0f..1cce7bc618 100644
--- a/devel/iv/mathematical-formula.html
+++ b/devel/iv/mathematical-formula.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Formulas and Mathematical Detail - linearmodels v6.1 (+13)</title>
+        <title>Formulas and Mathematical Detail - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/iv/reference.html b/devel/iv/reference.html
index 0f520e4497..527b8d706d 100644
--- a/devel/iv/reference.html
+++ b/devel/iv/reference.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Module Reference - linearmodels v6.1 (+13)</title>
+        <title>Module Reference - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/objects.inv b/devel/objects.inv
index c0a945edac..b89d31bdd4 100644
Binary files a/devel/objects.inv and b/devel/objects.inv differ
diff --git a/devel/panel/examples/data-formats.html b/devel/panel/examples/data-formats.html
index 8e1a011560..ebf923c345 100644
--- a/devel/panel/examples/data-formats.html
+++ b/devel/panel/examples/data-formats.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Data Formats for Panel Data Analysis - linearmodels v6.1 (+13)</title>
+        <title>Data Formats for Panel Data Analysis - linearmodels v6.1 (+15)</title>
       
     
 
@@ -94,7 +94,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -104,7 +104,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -191,10 +191,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
@@ -760,7 +760,7 @@ <h2 id="MultiIndex-DataFrames">MultiIndex DataFrames<a class="headerlink" href="
 Estimator:                   PanelOLS   R-squared (Between):             -0.0379
 No. Observations:                 140   R-squared (Within):               0.0528
 Date:                Tue, Sep 24 2024   R-squared (Overall):             -0.0288
-Time:                        09:24:52   Log-likelihood                   -90.459
+Time:                        09:29:05   Log-likelihood                   -90.459
 Cov. Estimator:            Unadjusted
                                         F-statistic:                      5.0751
 Entities:                          48   P-value                           0.0267
@@ -829,7 +829,7 @@ <h2 id="NumPy-arrays">NumPy arrays<a class="headerlink" href="#NumPy-arrays" tit
 Estimator:                   PanelOLS   R-squared (Between):             -0.0379
 No. Observations:                 140   R-squared (Within):               0.0528
 Date:                Tue, Sep 24 2024   R-squared (Overall):             -0.0288
-Time:                        09:24:52   Log-likelihood                   -90.459
+Time:                        09:29:05   Log-likelihood                   -90.459
 Cov. Estimator:            Unadjusted
                                         F-statistic:                      5.0751
 Entities:                          48   P-value                           0.0267
@@ -914,7 +914,7 @@ <h2 id="xarray-DataArrays">xarray DataArrays<a class="headerlink" href="#xarray-
 Estimator:                   PanelOLS   R-squared (Between):             -0.0379
 No. Observations:                 140   R-squared (Within):               0.0528
 Date:                Tue, Sep 24 2024   R-squared (Overall):             -0.0288
-Time:                        09:24:52   Log-likelihood                   -90.459
+Time:                        09:29:05   Log-likelihood                   -90.459
 Cov. Estimator:            Unadjusted
                                         F-statistic:                      5.0751
 Entities:                          48   P-value                           0.0267
@@ -996,7 +996,7 @@ <h2 id="Conversion-of-Categorical-and-Strings-to-Dummies">Conversion of Categori
 Estimator:                   PanelOLS   R-squared (Between):             -0.1240
 No. Observations:                 140   R-squared (Within):               0.1985
 Date:                Tue, Sep 24 2024   R-squared (Overall):             -0.0934
-Time:                        09:24:52   Log-likelihood                   -78.765
+Time:                        09:29:05   Log-likelihood                   -78.765
 Cov. Estimator:            Unadjusted
                                         F-statistic:                      7.3496
 Entities:                          48   P-value                           0.0002
@@ -1063,7 +1063,7 @@ <h2 id="Conversion-of-Categorical-and-Strings-to-Dummies">Conversion of Categori
 Estimator:                   PanelOLS   R-squared (Between):             -0.1240
 No. Observations:                 140   R-squared (Within):               0.1985
 Date:                Tue, Sep 24 2024   R-squared (Overall):             -0.0934
-Time:                        09:24:52   Log-likelihood                   -78.765
+Time:                        09:29:05   Log-likelihood                   -78.765
 Cov. Estimator:            Unadjusted
                                         F-statistic:                      7.3496
 Entities:                          48   P-value                           0.0002
diff --git a/devel/panel/examples/data-formats.ipynb b/devel/panel/examples/data-formats.ipynb
index 181fef1862..555e643b16 100644
--- a/devel/panel/examples/data-formats.ipynb
+++ b/devel/panel/examples/data-formats.ipynb
@@ -27,10 +27,10 @@
    "execution_count": 1,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:50.150547Z",
-     "iopub.status.busy": "2024-09-24T09:24:50.150310Z",
-     "iopub.status.idle": "2024-09-24T09:24:51.850761Z",
-     "shell.execute_reply": "2024-09-24T09:24:51.849933Z"
+     "iopub.execute_input": "2024-09-24T09:29:03.528166Z",
+     "iopub.status.busy": "2024-09-24T09:29:03.526285Z",
+     "iopub.status.idle": "2024-09-24T09:29:05.209610Z",
+     "shell.execute_reply": "2024-09-24T09:29:05.208812Z"
     }
    },
    "outputs": [
@@ -82,10 +82,10 @@
    "execution_count": 2,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:51.963093Z",
-     "iopub.status.busy": "2024-09-24T09:24:51.959403Z",
-     "iopub.status.idle": "2024-09-24T09:24:51.978234Z",
-     "shell.execute_reply": "2024-09-24T09:24:51.977457Z"
+     "iopub.execute_input": "2024-09-24T09:29:05.313057Z",
+     "iopub.status.busy": "2024-09-24T09:29:05.312731Z",
+     "iopub.status.idle": "2024-09-24T09:29:05.331687Z",
+     "shell.execute_reply": "2024-09-24T09:29:05.330899Z"
     }
    },
    "outputs": [
@@ -124,10 +124,10 @@
    "execution_count": 3,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:51.985630Z",
-     "iopub.status.busy": "2024-09-24T09:24:51.985348Z",
-     "iopub.status.idle": "2024-09-24T09:24:52.089567Z",
-     "shell.execute_reply": "2024-09-24T09:24:52.088933Z"
+     "iopub.execute_input": "2024-09-24T09:29:05.335817Z",
+     "iopub.status.busy": "2024-09-24T09:29:05.335417Z",
+     "iopub.status.idle": "2024-09-24T09:29:05.421113Z",
+     "shell.execute_reply": "2024-09-24T09:29:05.420281Z"
     }
    },
    "outputs": [
@@ -141,7 +141,7 @@
       "Estimator:                   PanelOLS   R-squared (Between):             -0.0379\n",
       "No. Observations:                 140   R-squared (Within):               0.0528\n",
       "Date:                Tue, Sep 24 2024   R-squared (Overall):             -0.0288\n",
-      "Time:                        09:24:52   Log-likelihood                   -90.459\n",
+      "Time:                        09:29:05   Log-likelihood                   -90.459\n",
       "Cov. Estimator:            Unadjusted                                           \n",
       "                                        F-statistic:                      5.0751\n",
       "Entities:                          48   P-value                           0.0267\n",
@@ -191,10 +191,10 @@
    "execution_count": 4,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:52.093204Z",
-     "iopub.status.busy": "2024-09-24T09:24:52.092932Z",
-     "iopub.status.idle": "2024-09-24T09:24:52.108602Z",
-     "shell.execute_reply": "2024-09-24T09:24:52.107937Z"
+     "iopub.execute_input": "2024-09-24T09:29:05.428722Z",
+     "iopub.status.busy": "2024-09-24T09:29:05.428250Z",
+     "iopub.status.idle": "2024-09-24T09:29:05.438774Z",
+     "shell.execute_reply": "2024-09-24T09:29:05.438122Z"
     }
    },
    "outputs": [],
@@ -216,10 +216,10 @@
    "execution_count": 5,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:52.113870Z",
-     "iopub.status.busy": "2024-09-24T09:24:52.113607Z",
-     "iopub.status.idle": "2024-09-24T09:24:52.233201Z",
-     "shell.execute_reply": "2024-09-24T09:24:52.232520Z"
+     "iopub.execute_input": "2024-09-24T09:29:05.443102Z",
+     "iopub.status.busy": "2024-09-24T09:29:05.442240Z",
+     "iopub.status.idle": "2024-09-24T09:29:05.515221Z",
+     "shell.execute_reply": "2024-09-24T09:29:05.514101Z"
     }
    },
    "outputs": [
@@ -233,7 +233,7 @@
       "Estimator:                   PanelOLS   R-squared (Between):             -0.0379\n",
       "No. Observations:                 140   R-squared (Within):               0.0528\n",
       "Date:                Tue, Sep 24 2024   R-squared (Overall):             -0.0288\n",
-      "Time:                        09:24:52   Log-likelihood                   -90.459\n",
+      "Time:                        09:29:05   Log-likelihood                   -90.459\n",
       "Cov. Estimator:            Unadjusted                                           \n",
       "                                        F-statistic:                      5.0751\n",
       "Entities:                          48   P-value                           0.0267\n",
@@ -291,10 +291,10 @@
    "execution_count": 6,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:52.240071Z",
-     "iopub.status.busy": "2024-09-24T09:24:52.236096Z",
-     "iopub.status.idle": "2024-09-24T09:24:52.262619Z",
-     "shell.execute_reply": "2024-09-24T09:24:52.261943Z"
+     "iopub.execute_input": "2024-09-24T09:29:05.518335Z",
+     "iopub.status.busy": "2024-09-24T09:29:05.518055Z",
+     "iopub.status.idle": "2024-09-24T09:29:05.535604Z",
+     "shell.execute_reply": "2024-09-24T09:29:05.534989Z"
     }
    },
    "outputs": [
@@ -326,10 +326,10 @@
    "execution_count": 7,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:52.265973Z",
-     "iopub.status.busy": "2024-09-24T09:24:52.265682Z",
-     "iopub.status.idle": "2024-09-24T09:24:52.406670Z",
-     "shell.execute_reply": "2024-09-24T09:24:52.406006Z"
+     "iopub.execute_input": "2024-09-24T09:29:05.538191Z",
+     "iopub.status.busy": "2024-09-24T09:29:05.537939Z",
+     "iopub.status.idle": "2024-09-24T09:29:05.660079Z",
+     "shell.execute_reply": "2024-09-24T09:29:05.658987Z"
     }
    },
    "outputs": [
@@ -343,7 +343,7 @@
       "Estimator:                   PanelOLS   R-squared (Between):             -0.0379\n",
       "No. Observations:                 140   R-squared (Within):               0.0528\n",
       "Date:                Tue, Sep 24 2024   R-squared (Overall):             -0.0288\n",
-      "Time:                        09:24:52   Log-likelihood                   -90.459\n",
+      "Time:                        09:29:05   Log-likelihood                   -90.459\n",
       "Cov. Estimator:            Unadjusted                                           \n",
       "                                        F-statistic:                      5.0751\n",
       "Entities:                          48   P-value                           0.0267\n",
@@ -389,10 +389,10 @@
    "execution_count": 8,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:52.413055Z",
-     "iopub.status.busy": "2024-09-24T09:24:52.409382Z",
-     "iopub.status.idle": "2024-09-24T09:24:52.423071Z",
-     "shell.execute_reply": "2024-09-24T09:24:52.422457Z"
+     "iopub.execute_input": "2024-09-24T09:29:05.664077Z",
+     "iopub.status.busy": "2024-09-24T09:29:05.663666Z",
+     "iopub.status.idle": "2024-09-24T09:29:05.680836Z",
+     "shell.execute_reply": "2024-09-24T09:29:05.679997Z"
     }
    },
    "outputs": [],
@@ -419,10 +419,10 @@
    "execution_count": 9,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:52.428214Z",
-     "iopub.status.busy": "2024-09-24T09:24:52.427592Z",
-     "iopub.status.idle": "2024-09-24T09:24:52.531638Z",
-     "shell.execute_reply": "2024-09-24T09:24:52.530842Z"
+     "iopub.execute_input": "2024-09-24T09:29:05.683588Z",
+     "iopub.status.busy": "2024-09-24T09:29:05.683306Z",
+     "iopub.status.idle": "2024-09-24T09:29:05.768814Z",
+     "shell.execute_reply": "2024-09-24T09:29:05.767996Z"
     }
    },
    "outputs": [
@@ -430,13 +430,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "Exogenous variables\n"
-     ]
-    },
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
+      "Exogenous variables\n",
       "               hrsemp year_str\n",
       "fcode  year                   \n",
       "410523 1987  20.00000     1987\n",
@@ -446,14 +440,20 @@
       "410563 1987   0.00000     1987\n",
       "hrsemp      float64\n",
       "year_str     object\n",
-      "dtype: object\n",
+      "dtype: object\n"
+     ]
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
       "                          PanelOLS Estimation Summary                           \n",
       "================================================================================\n",
       "Dep. Variable:                 lscrap   R-squared:                        0.1985\n",
       "Estimator:                   PanelOLS   R-squared (Between):             -0.1240\n",
       "No. Observations:                 140   R-squared (Within):               0.1985\n",
       "Date:                Tue, Sep 24 2024   R-squared (Overall):             -0.0934\n",
-      "Time:                        09:24:52   Log-likelihood                   -78.765\n",
+      "Time:                        09:29:05   Log-likelihood                   -78.765\n",
       "Cov. Estimator:            Unadjusted                                           \n",
       "                                        F-statistic:                      7.3496\n",
       "Entities:                          48   P-value                           0.0002\n",
@@ -506,10 +506,10 @@
    "execution_count": 10,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:52.537662Z",
-     "iopub.status.busy": "2024-09-24T09:24:52.537358Z",
-     "iopub.status.idle": "2024-09-24T09:24:52.610620Z",
-     "shell.execute_reply": "2024-09-24T09:24:52.609927Z"
+     "iopub.execute_input": "2024-09-24T09:29:05.774819Z",
+     "iopub.status.busy": "2024-09-24T09:29:05.774514Z",
+     "iopub.status.idle": "2024-09-24T09:29:05.931925Z",
+     "shell.execute_reply": "2024-09-24T09:29:05.931055Z"
     }
    },
    "outputs": [
@@ -527,14 +527,20 @@
       "410563 1987   0.00000     1987\n",
       "hrsemp       float64\n",
       "year_cat    category\n",
-      "dtype: object\n",
+      "dtype: object\n"
+     ]
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
       "                          PanelOLS Estimation Summary                           \n",
       "================================================================================\n",
       "Dep. Variable:                 lscrap   R-squared:                        0.1985\n",
       "Estimator:                   PanelOLS   R-squared (Between):             -0.1240\n",
       "No. Observations:                 140   R-squared (Within):               0.1985\n",
       "Date:                Tue, Sep 24 2024   R-squared (Overall):             -0.0934\n",
-      "Time:                        09:24:52   Log-likelihood                   -78.765\n",
+      "Time:                        09:29:05   Log-likelihood                   -78.765\n",
       "Cov. Estimator:            Unadjusted                                           \n",
       "                                        F-statistic:                      7.3496\n",
       "Entities:                          48   P-value                           0.0002\n",
diff --git a/devel/panel/examples/examples.html b/devel/panel/examples/examples.html
index 35e85063c3..aaa35ccc9f 100644
--- a/devel/panel/examples/examples.html
+++ b/devel/panel/examples/examples.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Examples - linearmodels v6.1 (+13)</title>
+        <title>Examples - linearmodels v6.1 (+15)</title>
       
     
 
@@ -94,7 +94,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -104,7 +104,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -191,10 +191,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
@@ -1035,7 +1035,7 @@ <h2 id="Basic-regression-on-panel-data">Basic regression on panel data<a class="
 Estimator:                  PooledOLS   R-squared (Between):              0.2066
 No. Observations:                4360   R-squared (Within):               0.1692
 Date:                Tue, Sep 24 2024   R-squared (Overall):              0.1893
-Time:                        09:24:57   Log-likelihood                   -2982.0
+Time:                        09:29:10   Log-likelihood                   -2982.0
 Cov. Estimator:            Unadjusted
                                         F-statistic:                      72.459
 Entities:                         545   P-value                           0.0000
@@ -1100,7 +1100,7 @@ <h3 id="Random-effects">Random effects<a class="headerlink" href="#Random-effect
 Estimator:              RandomEffects   R-squared (Between):              0.1853
 No. Observations:                4360   R-squared (Within):               0.1799
 Date:                Tue, Sep 24 2024   R-squared (Overall):              0.1828
-Time:                        09:24:57   Log-likelihood                   -1622.5
+Time:                        09:29:11   Log-likelihood                   -1622.5
 Cov. Estimator:            Unadjusted
                                         F-statistic:                      68.409
 Entities:                         545   P-value                           0.0000
@@ -1248,7 +1248,7 @@ <h3 id="The-between-estimator">The between estimator<a class="headerlink" href="
 Estimator:                 BetweenOLS   R-squared (Between):              0.2155
 No. Observations:                 545   R-squared (Within):               0.1141
 Date:                Tue, Sep 24 2024   R-squared (Overall):              0.1686
-Time:                        09:24:57   Log-likelihood                   -194.54
+Time:                        09:29:11   Log-likelihood                   -194.54
 Cov. Estimator:            Unadjusted
                                         F-statistic:                      24.633
 Entities:                         545   P-value                           0.0000
@@ -1308,7 +1308,7 @@ <h4 id="Time-invariant-Variables">Time-invariant Variables<a class="headerlink"
 Estimator:                   PanelOLS   R-squared (Between):             -0.0052
 No. Observations:                4360   R-squared (Within):               0.1806
 Date:                Tue, Sep 24 2024   R-squared (Overall):              0.0807
-Time:                        09:24:58   Log-likelihood                   -1324.8
+Time:                        09:29:11   Log-likelihood                   -1324.8
 Cov. Estimator:            Unadjusted
                                         F-statistic:                      83.851
 Entities:                         545   P-value                           0.0000
@@ -1372,7 +1372,7 @@ <h4 id="Effects-vs-Dummies">Effects vs Dummies<a class="headerlink" href="#Effec
 Estimator:                   PanelOLS   R-squared (Between):             -0.0052
 No. Observations:                4360   R-squared (Within):              -0.4809
 Date:                Tue, Sep 24 2024   R-squared (Overall):             -0.2253
-Time:                        09:24:58   Log-likelihood                   -1324.8
+Time:                        09:29:11   Log-likelihood                   -1324.8
 Cov. Estimator:            Unadjusted
                                         F-statistic:                      27.959
 Entities:                         545   P-value                           0.0000
@@ -1443,7 +1443,7 @@ <h3 id="Other-Effects">Other Effects<a class="headerlink" href="#Other-Effects"
 Estimator:                   PanelOLS   R-squared (Between):             -0.0052
 No. Observations:                4360   R-squared (Within):              -0.4809
 Date:                Tue, Sep 24 2024   R-squared (Overall):             -0.2253
-Time:                        09:24:58   Log-likelihood                   -1324.8
+Time:                        09:29:11   Log-likelihood                   -1324.8
 Cov. Estimator:            Unadjusted
                                         F-statistic:                      27.959
 Entities:                         545   P-value                           0.0000
@@ -1503,7 +1503,7 @@ <h3 id="Using-first-differences">Using first differences<a class="headerlink" hr
 Estimator:         FirstDifferenceOLS   R-squared (Between):              0.5491
 No. Observations:                3815   R-squared (Within):               0.1763
 Date:                Tue, Sep 24 2024   R-squared (Overall):              0.5328
-Time:                        09:24:58   Log-likelihood                   -2305.5
+Time:                        09:29:11   Log-likelihood                   -2305.5
 Cov. Estimator:            Unadjusted
                                         F-statistic:                      26.208
 Entities:                         545   P-value                           0.0000
@@ -1720,7 +1720,7 @@ <h3 id="Other-clusters">Other clusters<a class="headerlink" href="#Other-cluster
 Estimator:                  PooledOLS   R-squared (Between):              0.2027
 No. Observations:                4360   R-squared (Within):               0.1679
 Date:                Tue, Sep 24 2024   R-squared (Overall):              0.1866
-Time:                        09:24:58   Log-likelihood                   -2989.2
+Time:                        09:29:12   Log-likelihood                   -2989.2
 Cov. Estimator:             Clustered
                                         F-statistic:                      142.61
 Entities:                         545   P-value                           0.0000
diff --git a/devel/panel/examples/examples.ipynb b/devel/panel/examples/examples.ipynb
index 51eab39e17..7494acf164 100644
--- a/devel/panel/examples/examples.ipynb
+++ b/devel/panel/examples/examples.ipynb
@@ -27,10 +27,10 @@
    "execution_count": 1,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:55.589434Z",
-     "iopub.status.busy": "2024-09-24T09:24:55.589161Z",
-     "iopub.status.idle": "2024-09-24T09:24:57.125354Z",
-     "shell.execute_reply": "2024-09-24T09:24:57.124606Z"
+     "iopub.execute_input": "2024-09-24T09:29:09.046239Z",
+     "iopub.status.busy": "2024-09-24T09:29:09.045975Z",
+     "iopub.status.idle": "2024-09-24T09:29:10.445494Z",
+     "shell.execute_reply": "2024-09-24T09:29:10.444844Z"
     }
    },
    "outputs": [
@@ -99,10 +99,10 @@
    "execution_count": 2,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:57.129331Z",
-     "iopub.status.busy": "2024-09-24T09:24:57.129033Z",
-     "iopub.status.idle": "2024-09-24T09:24:57.620554Z",
-     "shell.execute_reply": "2024-09-24T09:24:57.619853Z"
+     "iopub.execute_input": "2024-09-24T09:29:10.448297Z",
+     "iopub.status.busy": "2024-09-24T09:29:10.448055Z",
+     "iopub.status.idle": "2024-09-24T09:29:11.000384Z",
+     "shell.execute_reply": "2024-09-24T09:29:10.997138Z"
     }
    },
    "outputs": [
@@ -116,7 +116,7 @@
       "Estimator:                  PooledOLS   R-squared (Between):              0.2066\n",
       "No. Observations:                4360   R-squared (Within):               0.1692\n",
       "Date:                Tue, Sep 24 2024   R-squared (Overall):              0.1893\n",
-      "Time:                        09:24:57   Log-likelihood                   -2982.0\n",
+      "Time:                        09:29:10   Log-likelihood                   -2982.0\n",
       "Cov. Estimator:            Unadjusted                                           \n",
       "                                        F-statistic:                      72.459\n",
       "Entities:                         545   P-value                           0.0000\n",
@@ -188,10 +188,10 @@
    "execution_count": 3,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:57.625093Z",
-     "iopub.status.busy": "2024-09-24T09:24:57.624018Z",
-     "iopub.status.idle": "2024-09-24T09:24:57.850617Z",
-     "shell.execute_reply": "2024-09-24T09:24:57.849992Z"
+     "iopub.execute_input": "2024-09-24T09:29:11.003750Z",
+     "iopub.status.busy": "2024-09-24T09:29:11.003246Z",
+     "iopub.status.idle": "2024-09-24T09:29:11.291141Z",
+     "shell.execute_reply": "2024-09-24T09:29:11.290461Z"
     }
    },
    "outputs": [
@@ -205,7 +205,7 @@
       "Estimator:              RandomEffects   R-squared (Between):              0.1853\n",
       "No. Observations:                4360   R-squared (Within):               0.1799\n",
       "Date:                Tue, Sep 24 2024   R-squared (Overall):              0.1828\n",
-      "Time:                        09:24:57   Log-likelihood                   -1622.5\n",
+      "Time:                        09:29:11   Log-likelihood                   -1622.5\n",
       "Cov. Estimator:            Unadjusted                                           \n",
       "                                        F-statistic:                      68.409\n",
       "Entities:                         545   P-value                           0.0000\n",
@@ -261,10 +261,10 @@
    "execution_count": 4,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:57.855353Z",
-     "iopub.status.busy": "2024-09-24T09:24:57.855131Z",
-     "iopub.status.idle": "2024-09-24T09:24:57.870825Z",
-     "shell.execute_reply": "2024-09-24T09:24:57.870257Z"
+     "iopub.execute_input": "2024-09-24T09:29:11.301053Z",
+     "iopub.status.busy": "2024-09-24T09:29:11.300744Z",
+     "iopub.status.idle": "2024-09-24T09:29:11.323677Z",
+     "shell.execute_reply": "2024-09-24T09:29:11.323047Z"
     }
    },
    "outputs": [
@@ -298,10 +298,10 @@
    "execution_count": 5,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:57.874112Z",
-     "iopub.status.busy": "2024-09-24T09:24:57.873261Z",
-     "iopub.status.idle": "2024-09-24T09:24:57.882297Z",
-     "shell.execute_reply": "2024-09-24T09:24:57.881666Z"
+     "iopub.execute_input": "2024-09-24T09:29:11.326549Z",
+     "iopub.status.busy": "2024-09-24T09:29:11.326303Z",
+     "iopub.status.idle": "2024-09-24T09:29:11.343309Z",
+     "shell.execute_reply": "2024-09-24T09:29:11.340819Z"
     }
    },
    "outputs": [
@@ -392,10 +392,10 @@
    "execution_count": 6,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:57.885522Z",
-     "iopub.status.busy": "2024-09-24T09:24:57.885254Z",
-     "iopub.status.idle": "2024-09-24T09:24:57.950688Z",
-     "shell.execute_reply": "2024-09-24T09:24:57.949944Z"
+     "iopub.execute_input": "2024-09-24T09:29:11.349771Z",
+     "iopub.status.busy": "2024-09-24T09:29:11.349490Z",
+     "iopub.status.idle": "2024-09-24T09:29:11.465423Z",
+     "shell.execute_reply": "2024-09-24T09:29:11.464718Z"
     }
    },
    "outputs": [
@@ -409,7 +409,7 @@
       "Estimator:                 BetweenOLS   R-squared (Between):              0.2155\n",
       "No. Observations:                 545   R-squared (Within):               0.1141\n",
       "Date:                Tue, Sep 24 2024   R-squared (Overall):              0.1686\n",
-      "Time:                        09:24:57   Log-likelihood                   -194.54\n",
+      "Time:                        09:29:11   Log-likelihood                   -194.54\n",
       "Cov. Estimator:            Unadjusted                                           \n",
       "                                        F-statistic:                      24.633\n",
       "Entities:                         545   P-value                           0.0000\n",
@@ -480,10 +480,10 @@
    "execution_count": 7,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:57.953817Z",
-     "iopub.status.busy": "2024-09-24T09:24:57.953540Z",
-     "iopub.status.idle": "2024-09-24T09:24:58.105283Z",
-     "shell.execute_reply": "2024-09-24T09:24:58.101499Z"
+     "iopub.execute_input": "2024-09-24T09:29:11.469253Z",
+     "iopub.status.busy": "2024-09-24T09:29:11.468942Z",
+     "iopub.status.idle": "2024-09-24T09:29:11.649021Z",
+     "shell.execute_reply": "2024-09-24T09:29:11.643053Z"
     }
    },
    "outputs": [
@@ -497,7 +497,7 @@
       "Estimator:                   PanelOLS   R-squared (Between):             -0.0052\n",
       "No. Observations:                4360   R-squared (Within):               0.1806\n",
       "Date:                Tue, Sep 24 2024   R-squared (Overall):              0.0807\n",
-      "Time:                        09:24:58   Log-likelihood                   -1324.8\n",
+      "Time:                        09:29:11   Log-likelihood                   -1324.8\n",
       "Cov. Estimator:            Unadjusted                                           \n",
       "                                        F-statistic:                      83.851\n",
       "Entities:                         545   P-value                           0.0000\n",
@@ -561,10 +561,10 @@
    "execution_count": 8,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:58.107809Z",
-     "iopub.status.busy": "2024-09-24T09:24:58.107574Z",
-     "iopub.status.idle": "2024-09-24T09:24:58.214925Z",
-     "shell.execute_reply": "2024-09-24T09:24:58.214217Z"
+     "iopub.execute_input": "2024-09-24T09:29:11.654150Z",
+     "iopub.status.busy": "2024-09-24T09:29:11.651684Z",
+     "iopub.status.idle": "2024-09-24T09:29:11.816991Z",
+     "shell.execute_reply": "2024-09-24T09:29:11.816098Z"
     }
    },
    "outputs": [
@@ -578,7 +578,7 @@
       "Estimator:                   PanelOLS   R-squared (Between):             -0.0052\n",
       "No. Observations:                4360   R-squared (Within):              -0.4809\n",
       "Date:                Tue, Sep 24 2024   R-squared (Overall):             -0.2253\n",
-      "Time:                        09:24:58   Log-likelihood                   -1324.8\n",
+      "Time:                        09:29:11   Log-likelihood                   -1324.8\n",
       "Cov. Estimator:            Unadjusted                                           \n",
       "                                        F-statistic:                      27.959\n",
       "Entities:                         545   P-value                           0.0000\n",
@@ -645,10 +645,10 @@
    "execution_count": 9,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:58.218767Z",
-     "iopub.status.busy": "2024-09-24T09:24:58.218209Z",
-     "iopub.status.idle": "2024-09-24T09:24:58.334412Z",
-     "shell.execute_reply": "2024-09-24T09:24:58.331655Z"
+     "iopub.execute_input": "2024-09-24T09:29:11.825199Z",
+     "iopub.status.busy": "2024-09-24T09:29:11.824636Z",
+     "iopub.status.idle": "2024-09-24T09:29:11.935572Z",
+     "shell.execute_reply": "2024-09-24T09:29:11.934761Z"
     }
    },
    "outputs": [
@@ -662,7 +662,7 @@
       "Estimator:                   PanelOLS   R-squared (Between):             -0.0052\n",
       "No. Observations:                4360   R-squared (Within):              -0.4809\n",
       "Date:                Tue, Sep 24 2024   R-squared (Overall):             -0.2253\n",
-      "Time:                        09:24:58   Log-likelihood                   -1324.8\n",
+      "Time:                        09:29:11   Log-likelihood                   -1324.8\n",
       "Cov. Estimator:            Unadjusted                                           \n",
       "                                        F-statistic:                      27.959\n",
       "Entities:                         545   P-value                           0.0000\n",
@@ -724,10 +724,10 @@
    "execution_count": 10,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:58.338743Z",
-     "iopub.status.busy": "2024-09-24T09:24:58.338440Z",
-     "iopub.status.idle": "2024-09-24T09:24:58.465534Z",
-     "shell.execute_reply": "2024-09-24T09:24:58.464882Z"
+     "iopub.execute_input": "2024-09-24T09:29:11.938863Z",
+     "iopub.status.busy": "2024-09-24T09:29:11.938354Z",
+     "iopub.status.idle": "2024-09-24T09:29:12.003126Z",
+     "shell.execute_reply": "2024-09-24T09:29:12.002406Z"
     }
    },
    "outputs": [
@@ -741,7 +741,7 @@
       "Estimator:         FirstDifferenceOLS   R-squared (Between):              0.5491\n",
       "No. Observations:                3815   R-squared (Within):               0.1763\n",
       "Date:                Tue, Sep 24 2024   R-squared (Overall):              0.5328\n",
-      "Time:                        09:24:58   Log-likelihood                   -2305.5\n",
+      "Time:                        09:29:11   Log-likelihood                   -2305.5\n",
       "Cov. Estimator:            Unadjusted                                           \n",
       "                                        F-statistic:                      26.208\n",
       "Entities:                         545   P-value                           0.0000\n",
@@ -789,10 +789,10 @@
    "execution_count": 11,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:58.471380Z",
-     "iopub.status.busy": "2024-09-24T09:24:58.470861Z",
-     "iopub.status.idle": "2024-09-24T09:24:58.508606Z",
-     "shell.execute_reply": "2024-09-24T09:24:58.507944Z"
+     "iopub.execute_input": "2024-09-24T09:29:12.007112Z",
+     "iopub.status.busy": "2024-09-24T09:29:12.006161Z",
+     "iopub.status.idle": "2024-09-24T09:29:12.058187Z",
+     "shell.execute_reply": "2024-09-24T09:29:12.053663Z"
     }
    },
    "outputs": [
@@ -877,10 +877,10 @@
    "execution_count": 12,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:58.512182Z",
-     "iopub.status.busy": "2024-09-24T09:24:58.511799Z",
-     "iopub.status.idle": "2024-09-24T09:24:58.560789Z",
-     "shell.execute_reply": "2024-09-24T09:24:58.559952Z"
+     "iopub.execute_input": "2024-09-24T09:29:12.064851Z",
+     "iopub.status.busy": "2024-09-24T09:29:12.061010Z",
+     "iopub.status.idle": "2024-09-24T09:29:12.134805Z",
+     "shell.execute_reply": "2024-09-24T09:29:12.134112Z"
     }
    },
    "outputs": [],
@@ -904,10 +904,10 @@
    "execution_count": 13,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:58.564200Z",
-     "iopub.status.busy": "2024-09-24T09:24:58.563913Z",
-     "iopub.status.idle": "2024-09-24T09:24:58.596589Z",
-     "shell.execute_reply": "2024-09-24T09:24:58.595951Z"
+     "iopub.execute_input": "2024-09-24T09:29:12.139630Z",
+     "iopub.status.busy": "2024-09-24T09:29:12.139196Z",
+     "iopub.status.idle": "2024-09-24T09:29:12.177898Z",
+     "shell.execute_reply": "2024-09-24T09:29:12.177195Z"
     }
    },
    "outputs": [],
@@ -927,10 +927,10 @@
    "execution_count": 14,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:58.600162Z",
-     "iopub.status.busy": "2024-09-24T09:24:58.599859Z",
-     "iopub.status.idle": "2024-09-24T09:24:58.660239Z",
-     "shell.execute_reply": "2024-09-24T09:24:58.657865Z"
+     "iopub.execute_input": "2024-09-24T09:29:12.182434Z",
+     "iopub.status.busy": "2024-09-24T09:29:12.182200Z",
+     "iopub.status.idle": "2024-09-24T09:29:12.222726Z",
+     "shell.execute_reply": "2024-09-24T09:29:12.222007Z"
     }
    },
    "outputs": [],
@@ -954,10 +954,10 @@
    "execution_count": 15,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:58.664093Z",
-     "iopub.status.busy": "2024-09-24T09:24:58.663013Z",
-     "iopub.status.idle": "2024-09-24T09:24:58.843581Z",
-     "shell.execute_reply": "2024-09-24T09:24:58.842853Z"
+     "iopub.execute_input": "2024-09-24T09:29:12.226708Z",
+     "iopub.status.busy": "2024-09-24T09:29:12.225667Z",
+     "iopub.status.idle": "2024-09-24T09:29:12.515569Z",
+     "shell.execute_reply": "2024-09-24T09:29:12.514835Z"
     }
    },
    "outputs": [
@@ -1025,10 +1025,10 @@
    "execution_count": 16,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:58.847180Z",
-     "iopub.status.busy": "2024-09-24T09:24:58.846211Z",
-     "iopub.status.idle": "2024-09-24T09:24:58.892169Z",
-     "shell.execute_reply": "2024-09-24T09:24:58.891598Z"
+     "iopub.execute_input": "2024-09-24T09:29:12.520756Z",
+     "iopub.status.busy": "2024-09-24T09:29:12.520408Z",
+     "iopub.status.idle": "2024-09-24T09:29:12.656214Z",
+     "shell.execute_reply": "2024-09-24T09:29:12.655564Z"
     }
    },
    "outputs": [
@@ -1053,7 +1053,7 @@
       "Estimator:                  PooledOLS   R-squared (Between):              0.2027\n",
       "No. Observations:                4360   R-squared (Within):               0.1679\n",
       "Date:                Tue, Sep 24 2024   R-squared (Overall):              0.1866\n",
-      "Time:                        09:24:58   Log-likelihood                   -2989.2\n",
+      "Time:                        09:29:12   Log-likelihood                   -2989.2\n",
       "Cov. Estimator:             Clustered                                           \n",
       "                                        F-statistic:                      142.61\n",
       "Entities:                         545   P-value                           0.0000\n",
diff --git a/devel/panel/examples/using-formulas.html b/devel/panel/examples/using-formulas.html
index 0310c9b97f..367d5adf29 100644
--- a/devel/panel/examples/using-formulas.html
+++ b/devel/panel/examples/using-formulas.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Using formulas to specify models - linearmodels v6.1 (+13)</title>
+        <title>Using formulas to specify models - linearmodels v6.1 (+15)</title>
       
     
 
@@ -94,7 +94,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -104,7 +104,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -191,10 +191,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
@@ -764,7 +764,7 @@ <h2 id="PanelOLS-with-Entity-Effects-and-a-constant">PanelOLS with Entity Effect
 Estimator:                   PanelOLS   R-squared (Between):              0.8223
 No. Observations:                 220   R-squared (Within):               0.7667
 Date:                Tue, Sep 24 2024   R-squared (Overall):              0.8132
-Time:                        09:25:03   Log-likelihood                   -1167.4
+Time:                        09:29:17   Log-likelihood                   -1167.4
 Cov. Estimator:            Unadjusted
                                         F-statistic:                      340.08
 Entities:                          11   P-value                           0.0000
@@ -812,7 +812,7 @@ <h2 id="PanelOLS-with-Entity-Effects-and-a-constant">PanelOLS with Entity Effect
 Estimator:                   PanelOLS   R-squared (Between):              0.8193
 No. Observations:                 220   R-squared (Within):               0.7667
 Date:                Tue, Sep 24 2024   R-squared (Overall):              0.8071
-Time:                        09:25:03   Log-likelihood                   -1167.4
+Time:                        09:29:17   Log-likelihood                   -1167.4
 Cov. Estimator:            Unadjusted
                                         F-statistic:                      340.08
 Entities:                          11   P-value                           0.0000
@@ -865,7 +865,7 @@ <h2 id="Panel-with-Entity-and-Time-Effects">Panel with Entity and Time Effects<a
 Estimator:                   PanelOLS   R-squared (Between):              0.7944
 No. Observations:                 220   R-squared (Within):               0.7566
 Date:                Tue, Sep 24 2024   R-squared (Overall):              0.7856
-Time:                        09:25:03   Log-likelihood                   -1153.0
+Time:                        09:29:17   Log-likelihood                   -1153.0
 Cov. Estimator:            Unadjusted
                                         F-statistic:                      248.15
 Entities:                          11   P-value                           0.0000
@@ -918,7 +918,7 @@ <h2 id="Between-OLS">Between OLS<a class="headerlink" href="#Between-OLS" title=
 Estimator:                 BetweenOLS   R-squared (Between):              0.8644
 No. Observations:                  11   R-squared (Within):               0.4195
 Date:                Tue, Sep 24 2024   R-squared (Overall):              0.7616
-Time:                        09:25:03   Log-likelihood                   -61.997
+Time:                        09:29:17   Log-likelihood                   -61.997
 Cov. Estimator:            Unadjusted
                                         F-statistic:                      25.500
 Entities:                          11   P-value                           0.0003
@@ -963,7 +963,7 @@ <h2 id="First-Difference-OLS">First Difference OLS<a class="headerlink" href="#F
 Estimator:         FirstDifferenceOLS   R-squared (Between):              0.8643
 No. Observations:                 209   R-squared (Within):               0.7539
 Date:                Tue, Sep 24 2024   R-squared (Overall):              0.8461
-Time:                        09:25:03   Log-likelihood                   -1071.1
+Time:                        09:29:17   Log-likelihood                   -1071.1
 Cov. Estimator:            Unadjusted
                                         F-statistic:                      77.679
 Entities:                          11   P-value                           0.0000
@@ -1007,7 +1007,7 @@ <h2 id="Pooled-OLS">Pooled OLS<a class="headerlink" href="#Pooled-OLS" title="Li
 Estimator:                  PooledOLS   R-squared (Between):              0.8426
 No. Observations:                 220   R-squared (Within):               0.7357
 Date:                Tue, Sep 24 2024   R-squared (Overall):              0.8179
-Time:                        09:25:04   Log-likelihood                   -1301.3
+Time:                        09:29:17   Log-likelihood                   -1301.3
 Cov. Estimator:            Unadjusted
                                         F-statistic:                      487.28
 Entities:                          11   P-value                           0.0000
diff --git a/devel/panel/examples/using-formulas.ipynb b/devel/panel/examples/using-formulas.ipynb
index f79431fe8b..47742252f8 100644
--- a/devel/panel/examples/using-formulas.ipynb
+++ b/devel/panel/examples/using-formulas.ipynb
@@ -32,10 +32,10 @@
    "execution_count": 1,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:02.041104Z",
-     "iopub.status.busy": "2024-09-24T09:25:02.039643Z",
-     "iopub.status.idle": "2024-09-24T09:25:02.688733Z",
-     "shell.execute_reply": "2024-09-24T09:25:02.687938Z"
+     "iopub.execute_input": "2024-09-24T09:29:15.533522Z",
+     "iopub.status.busy": "2024-09-24T09:29:15.533240Z",
+     "iopub.status.idle": "2024-09-24T09:29:16.218377Z",
+     "shell.execute_reply": "2024-09-24T09:29:16.215836Z"
     }
    },
    "outputs": [
@@ -85,10 +85,10 @@
    "metadata": {
     "collapsed": false,
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:02.693311Z",
-     "iopub.status.busy": "2024-09-24T09:25:02.691262Z",
-     "iopub.status.idle": "2024-09-24T09:25:03.717464Z",
-     "shell.execute_reply": "2024-09-24T09:25:03.716825Z"
+     "iopub.execute_input": "2024-09-24T09:29:16.224226Z",
+     "iopub.status.busy": "2024-09-24T09:29:16.223917Z",
+     "iopub.status.idle": "2024-09-24T09:29:17.083655Z",
+     "shell.execute_reply": "2024-09-24T09:29:17.082986Z"
     },
     "jupyter": {
      "outputs_hidden": false
@@ -105,7 +105,7 @@
       "Estimator:                   PanelOLS   R-squared (Between):              0.8223\n",
       "No. Observations:                 220   R-squared (Within):               0.7667\n",
       "Date:                Tue, Sep 24 2024   R-squared (Overall):              0.8132\n",
-      "Time:                        09:25:03   Log-likelihood                   -1167.4\n",
+      "Time:                        09:29:17   Log-likelihood                   -1167.4\n",
       "Cov. Estimator:            Unadjusted                                           \n",
       "                                        F-statistic:                      340.08\n",
       "Entities:                          11   P-value                           0.0000\n",
@@ -146,10 +146,10 @@
    "execution_count": 3,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:03.726204Z",
-     "iopub.status.busy": "2024-09-24T09:25:03.722428Z",
-     "iopub.status.idle": "2024-09-24T09:25:03.779669Z",
-     "shell.execute_reply": "2024-09-24T09:25:03.778943Z"
+     "iopub.execute_input": "2024-09-24T09:29:17.089251Z",
+     "iopub.status.busy": "2024-09-24T09:29:17.086295Z",
+     "iopub.status.idle": "2024-09-24T09:29:17.179862Z",
+     "shell.execute_reply": "2024-09-24T09:29:17.173487Z"
     }
    },
    "outputs": [
@@ -163,7 +163,7 @@
       "Estimator:                   PanelOLS   R-squared (Between):              0.8193\n",
       "No. Observations:                 220   R-squared (Within):               0.7667\n",
       "Date:                Tue, Sep 24 2024   R-squared (Overall):              0.8071\n",
-      "Time:                        09:25:03   Log-likelihood                   -1167.4\n",
+      "Time:                        09:29:17   Log-likelihood                   -1167.4\n",
       "Cov. Estimator:            Unadjusted                                           \n",
       "                                        F-statistic:                      340.08\n",
       "Entities:                          11   P-value                           0.0000\n",
@@ -212,10 +212,10 @@
    "execution_count": 4,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:03.782683Z",
-     "iopub.status.busy": "2024-09-24T09:25:03.782307Z",
-     "iopub.status.idle": "2024-09-24T09:25:03.848410Z",
-     "shell.execute_reply": "2024-09-24T09:25:03.847686Z"
+     "iopub.execute_input": "2024-09-24T09:29:17.184144Z",
+     "iopub.status.busy": "2024-09-24T09:29:17.181986Z",
+     "iopub.status.idle": "2024-09-24T09:29:17.282627Z",
+     "shell.execute_reply": "2024-09-24T09:29:17.281994Z"
     }
    },
    "outputs": [
@@ -229,7 +229,7 @@
       "Estimator:                   PanelOLS   R-squared (Between):              0.7944\n",
       "No. Observations:                 220   R-squared (Within):               0.7566\n",
       "Date:                Tue, Sep 24 2024   R-squared (Overall):              0.7856\n",
-      "Time:                        09:25:03   Log-likelihood                   -1153.0\n",
+      "Time:                        09:29:17   Log-likelihood                   -1153.0\n",
       "Cov. Estimator:            Unadjusted                                           \n",
       "                                        F-statistic:                      248.15\n",
       "Entities:                          11   P-value                           0.0000\n",
@@ -280,10 +280,10 @@
    "execution_count": 5,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:03.850634Z",
-     "iopub.status.busy": "2024-09-24T09:25:03.850415Z",
-     "iopub.status.idle": "2024-09-24T09:25:03.897274Z",
-     "shell.execute_reply": "2024-09-24T09:25:03.894297Z"
+     "iopub.execute_input": "2024-09-24T09:29:17.285176Z",
+     "iopub.status.busy": "2024-09-24T09:29:17.284933Z",
+     "iopub.status.idle": "2024-09-24T09:29:17.359268Z",
+     "shell.execute_reply": "2024-09-24T09:29:17.353479Z"
     }
    },
    "outputs": [
@@ -297,7 +297,7 @@
       "Estimator:                 BetweenOLS   R-squared (Between):              0.8644\n",
       "No. Observations:                  11   R-squared (Within):               0.4195\n",
       "Date:                Tue, Sep 24 2024   R-squared (Overall):              0.7616\n",
-      "Time:                        09:25:03   Log-likelihood                   -61.997\n",
+      "Time:                        09:29:17   Log-likelihood                   -61.997\n",
       "Cov. Estimator:            Unadjusted                                           \n",
       "                                        F-statistic:                      25.500\n",
       "Entities:                          11   P-value                           0.0003\n",
@@ -342,10 +342,10 @@
    "execution_count": 6,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:03.903261Z",
-     "iopub.status.busy": "2024-09-24T09:25:03.902638Z",
-     "iopub.status.idle": "2024-09-24T09:25:04.004209Z",
-     "shell.execute_reply": "2024-09-24T09:25:04.001129Z"
+     "iopub.execute_input": "2024-09-24T09:29:17.362071Z",
+     "iopub.status.busy": "2024-09-24T09:29:17.361800Z",
+     "iopub.status.idle": "2024-09-24T09:29:17.463328Z",
+     "shell.execute_reply": "2024-09-24T09:29:17.462195Z"
     }
    },
    "outputs": [
@@ -359,7 +359,7 @@
       "Estimator:         FirstDifferenceOLS   R-squared (Between):              0.8643\n",
       "No. Observations:                 209   R-squared (Within):               0.7539\n",
       "Date:                Tue, Sep 24 2024   R-squared (Overall):              0.8461\n",
-      "Time:                        09:25:03   Log-likelihood                   -1071.1\n",
+      "Time:                        09:29:17   Log-likelihood                   -1071.1\n",
       "Cov. Estimator:            Unadjusted                                           \n",
       "                                        F-statistic:                      77.679\n",
       "Entities:                          11   P-value                           0.0000\n",
@@ -401,10 +401,10 @@
    "execution_count": 7,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:25:04.008133Z",
-     "iopub.status.busy": "2024-09-24T09:25:04.007176Z",
-     "iopub.status.idle": "2024-09-24T09:25:04.051222Z",
-     "shell.execute_reply": "2024-09-24T09:25:04.048937Z"
+     "iopub.execute_input": "2024-09-24T09:29:17.469001Z",
+     "iopub.status.busy": "2024-09-24T09:29:17.468709Z",
+     "iopub.status.idle": "2024-09-24T09:29:17.543935Z",
+     "shell.execute_reply": "2024-09-24T09:29:17.543159Z"
     }
    },
    "outputs": [
@@ -418,7 +418,7 @@
       "Estimator:                  PooledOLS   R-squared (Between):              0.8426\n",
       "No. Observations:                 220   R-squared (Within):               0.7357\n",
       "Date:                Tue, Sep 24 2024   R-squared (Overall):              0.8179\n",
-      "Time:                        09:25:04   Log-likelihood                   -1301.3\n",
+      "Time:                        09:29:17   Log-likelihood                   -1301.3\n",
       "Cov. Estimator:            Unadjusted                                           \n",
       "                                        F-statistic:                      487.28\n",
       "Entities:                          11   P-value                           0.0000\n",
diff --git a/devel/panel/faq.html b/devel/panel/faq.html
index 18e8020d03..aabaef7758 100644
--- a/devel/panel/faq.html
+++ b/devel/panel/faq.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Implementation Choices - linearmodels v6.1 (+13)</title>
+        <title>Implementation Choices - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/index.html b/devel/panel/index.html
index bd6c901dcd..b1312de932 100644
--- a/devel/panel/index.html
+++ b/devel/panel/index.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Panel Data Model Estimation - linearmodels v6.1 (+13)</title>
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@@ -88,7 +88,7 @@
 
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+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -98,7 +98,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -185,10 +185,10 @@
 
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+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/introduction.html b/devel/panel/introduction.html
index d78bbc8f76..fbbe151390 100644
--- a/devel/panel/introduction.html
+++ b/devel/panel/introduction.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Introduction - linearmodels v6.1 (+13)</title>
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@@ -88,7 +88,7 @@
 
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+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -98,7 +98,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -185,10 +185,10 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/mathematical-formula.html b/devel/panel/mathematical-formula.html
index 0d82be0f98..a566aa6cd6 100644
--- a/devel/panel/mathematical-formula.html
+++ b/devel/panel/mathematical-formula.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Formulas and Mathematical Detail - linearmodels v6.1 (+13)</title>
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@@ -93,7 +93,7 @@
 
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+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/pandas.html b/devel/panel/pandas.html
index c562343515..39106481fd 100644
--- a/devel/panel/pandas.html
+++ b/devel/panel/pandas.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Comparison with pandas PanelOLS and FamaMacBeth - linearmodels v6.1 (+13)</title>
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@@ -88,7 +88,7 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -98,7 +98,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -185,10 +185,10 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.covariance.ACCovariance.ALLOWED_KWARGS.html b/devel/panel/panel/linearmodels.panel.covariance.ACCovariance.ALLOWED_KWARGS.html
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.covariance.ACCovariance.DEFAULT_KERNEL.html b/devel/panel/panel/linearmodels.panel.covariance.ACCovariance.DEFAULT_KERNEL.html
index 3baa8b5880..98db93cea5 100644
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@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.covariance.ACCovariance.cov.html b/devel/panel/panel/linearmodels.panel.covariance.ACCovariance.cov.html
index 976946c01b..728fabad0a 100644
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.covariance.ACCovariance.cov - linearmodels v6.1 (+13)</title>
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@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.covariance.ACCovariance.deferred_cov.html b/devel/panel/panel/linearmodels.panel.covariance.ACCovariance.deferred_cov.html
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.covariance.ACCovariance.eps.html b/devel/panel/panel/linearmodels.panel.covariance.ACCovariance.eps.html
index 626a13ecab..2e42049dce 100644
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.covariance.ACCovariance.html b/devel/panel/panel/linearmodels.panel.covariance.ACCovariance.html
index 2606586be3..19dbd530f6 100644
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.covariance.ACCovariance - linearmodels v6.1 (+13)</title>
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@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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-            linearmodels v6.1 (+13)
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-    linearmodels v6.1 (+13)
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+    linearmodels v6.1 (+15)
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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@@ -103,7 +103,7 @@
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+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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@@ -103,7 +103,7 @@
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+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.covariance.HomoskedasticCovariance.html b/devel/panel/panel/linearmodels.panel.covariance.HomoskedasticCovariance.html
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@@ -15,7 +15,7 @@
     
   
       
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.panel.covariance.HomoskedasticCovariance.s2 - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.data.PanelData.demean.html b/devel/panel/panel/linearmodels.panel.data.PanelData.demean.html
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data.PanelData.drop.html b/devel/panel/panel/linearmodels.panel.data.PanelData.drop.html
index abe11c097b..96bb23801d 100644
--- a/devel/panel/panel/linearmodels.panel.data.PanelData.drop.html
+++ b/devel/panel/panel/linearmodels.panel.data.PanelData.drop.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data.PanelData.drop - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data.PanelData.drop - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data.PanelData.dummies.html b/devel/panel/panel/linearmodels.panel.data.PanelData.dummies.html
index 393b14091c..e549547cba 100644
--- a/devel/panel/panel/linearmodels.panel.data.PanelData.dummies.html
+++ b/devel/panel/panel/linearmodels.panel.data.PanelData.dummies.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data.PanelData.dummies - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data.PanelData.dummies - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data.PanelData.entities.html b/devel/panel/panel/linearmodels.panel.data.PanelData.entities.html
index 5a5bf3171e..af61bd29d5 100644
--- a/devel/panel/panel/linearmodels.panel.data.PanelData.entities.html
+++ b/devel/panel/panel/linearmodels.panel.data.PanelData.entities.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data.PanelData.entities - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data.PanelData.entities - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data.PanelData.entity_ids.html b/devel/panel/panel/linearmodels.panel.data.PanelData.entity_ids.html
index 75a9035980..7dc924ed5c 100644
--- a/devel/panel/panel/linearmodels.panel.data.PanelData.entity_ids.html
+++ b/devel/panel/panel/linearmodels.panel.data.PanelData.entity_ids.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data.PanelData.entity_ids - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data.PanelData.entity_ids - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data.PanelData.first_difference.html b/devel/panel/panel/linearmodels.panel.data.PanelData.first_difference.html
index 4d383583b7..20fe504329 100644
--- a/devel/panel/panel/linearmodels.panel.data.PanelData.first_difference.html
+++ b/devel/panel/panel/linearmodels.panel.data.PanelData.first_difference.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data.PanelData.first_difference - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data.PanelData.first_difference - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data.PanelData.general_demean.html b/devel/panel/panel/linearmodels.panel.data.PanelData.general_demean.html
index 93e335774c..9770948e1e 100644
--- a/devel/panel/panel/linearmodels.panel.data.PanelData.general_demean.html
+++ b/devel/panel/panel/linearmodels.panel.data.PanelData.general_demean.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data.PanelData.general_demean - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data.PanelData.general_demean - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data.PanelData.html b/devel/panel/panel/linearmodels.panel.data.PanelData.html
index 900de7df23..99c8f2758f 100644
--- a/devel/panel/panel/linearmodels.panel.data.PanelData.html
+++ b/devel/panel/panel/linearmodels.panel.data.PanelData.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data.PanelData - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data.PanelData - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data.PanelData.index.html b/devel/panel/panel/linearmodels.panel.data.PanelData.index.html
index a2d5941ce0..26b2722b95 100644
--- a/devel/panel/panel/linearmodels.panel.data.PanelData.index.html
+++ b/devel/panel/panel/linearmodels.panel.data.PanelData.index.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data.PanelData.index - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data.PanelData.index - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data.PanelData.isnull.html b/devel/panel/panel/linearmodels.panel.data.PanelData.isnull.html
index ac35f2e92e..34c80a45b4 100644
--- a/devel/panel/panel/linearmodels.panel.data.PanelData.isnull.html
+++ b/devel/panel/panel/linearmodels.panel.data.PanelData.isnull.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data.PanelData.isnull - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data.PanelData.isnull - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data.PanelData.mean.html b/devel/panel/panel/linearmodels.panel.data.PanelData.mean.html
index 319fd6afc1..b9f16106e3 100644
--- a/devel/panel/panel/linearmodels.panel.data.PanelData.mean.html
+++ b/devel/panel/panel/linearmodels.panel.data.PanelData.mean.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data.PanelData.mean - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data.PanelData.mean - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data.PanelData.ndim.html b/devel/panel/panel/linearmodels.panel.data.PanelData.ndim.html
index 339e3d88b7..790c39219f 100644
--- a/devel/panel/panel/linearmodels.panel.data.PanelData.ndim.html
+++ b/devel/panel/panel/linearmodels.panel.data.PanelData.ndim.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data.PanelData.ndim - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data.PanelData.ndim - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data.PanelData.nentity.html b/devel/panel/panel/linearmodels.panel.data.PanelData.nentity.html
index 32c681a68e..1020b9600a 100644
--- a/devel/panel/panel/linearmodels.panel.data.PanelData.nentity.html
+++ b/devel/panel/panel/linearmodels.panel.data.PanelData.nentity.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data.PanelData.nentity - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data.PanelData.nentity - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data.PanelData.nobs.html b/devel/panel/panel/linearmodels.panel.data.PanelData.nobs.html
index fe8658064a..70d9fc7fb5 100644
--- a/devel/panel/panel/linearmodels.panel.data.PanelData.nobs.html
+++ b/devel/panel/panel/linearmodels.panel.data.PanelData.nobs.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data.PanelData.nobs - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data.PanelData.nobs - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data.PanelData.nvar.html b/devel/panel/panel/linearmodels.panel.data.PanelData.nvar.html
index c9a759afc4..03a5b2502a 100644
--- a/devel/panel/panel/linearmodels.panel.data.PanelData.nvar.html
+++ b/devel/panel/panel/linearmodels.panel.data.PanelData.nvar.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data.PanelData.nvar - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data.PanelData.nvar - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data.PanelData.panel.html b/devel/panel/panel/linearmodels.panel.data.PanelData.panel.html
index fee592b40b..58195706f7 100644
--- a/devel/panel/panel/linearmodels.panel.data.PanelData.panel.html
+++ b/devel/panel/panel/linearmodels.panel.data.PanelData.panel.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data.PanelData.panel - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data.PanelData.panel - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data.PanelData.shape.html b/devel/panel/panel/linearmodels.panel.data.PanelData.shape.html
index 3f3710c6f6..60ce730e42 100644
--- a/devel/panel/panel/linearmodels.panel.data.PanelData.shape.html
+++ b/devel/panel/panel/linearmodels.panel.data.PanelData.shape.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data.PanelData.shape - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data.PanelData.shape - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data.PanelData.time.html b/devel/panel/panel/linearmodels.panel.data.PanelData.time.html
index a9e1fba2b6..6d55b4a0c5 100644
--- a/devel/panel/panel/linearmodels.panel.data.PanelData.time.html
+++ b/devel/panel/panel/linearmodels.panel.data.PanelData.time.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data.PanelData.time - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data.PanelData.time - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data.PanelData.time_ids.html b/devel/panel/panel/linearmodels.panel.data.PanelData.time_ids.html
index d571bd1434..e9aede9d3f 100644
--- a/devel/panel/panel/linearmodels.panel.data.PanelData.time_ids.html
+++ b/devel/panel/panel/linearmodels.panel.data.PanelData.time_ids.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data.PanelData.time_ids - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data.PanelData.time_ids - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data.PanelData.values2d.html b/devel/panel/panel/linearmodels.panel.data.PanelData.values2d.html
index 3c89bccee4..8aaa5793d6 100644
--- a/devel/panel/panel/linearmodels.panel.data.PanelData.values2d.html
+++ b/devel/panel/panel/linearmodels.panel.data.PanelData.values2d.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data.PanelData.values2d - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data.PanelData.values2d - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data.PanelData.values3d.html b/devel/panel/panel/linearmodels.panel.data.PanelData.values3d.html
index f2e067221a..93efc3bcb1 100644
--- a/devel/panel/panel/linearmodels.panel.data.PanelData.values3d.html
+++ b/devel/panel/panel/linearmodels.panel.data.PanelData.values3d.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data.PanelData.values3d - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data.PanelData.values3d - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data.PanelData.vars.html b/devel/panel/panel/linearmodels.panel.data.PanelData.vars.html
index d4ba2976e0..29ed5f10f5 100644
--- a/devel/panel/panel/linearmodels.panel.data.PanelData.vars.html
+++ b/devel/panel/panel/linearmodels.panel.data.PanelData.vars.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data.PanelData.vars - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data.PanelData.vars - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.data._Panel.from_array.html b/devel/panel/panel/linearmodels.panel.data._Panel.from_array.html
index a75494fb74..5c02f5f36b 100644
--- a/devel/panel/panel/linearmodels.panel.data._Panel.from_array.html
+++ b/devel/panel/panel/linearmodels.panel.data._Panel.from_array.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data._Panel.from_array - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data._Panel.from_array - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.data._Panel.html b/devel/panel/panel/linearmodels.panel.data._Panel.html
index c9f393ec4d..46fdd16c63 100644
--- a/devel/panel/panel/linearmodels.panel.data._Panel.html
+++ b/devel/panel/panel/linearmodels.panel.data._Panel.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data._Panel - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data._Panel - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data._Panel.items.html b/devel/panel/panel/linearmodels.panel.data._Panel.items.html
index eeb81874d8..4a24300ccf 100644
--- a/devel/panel/panel/linearmodels.panel.data._Panel.items.html
+++ b/devel/panel/panel/linearmodels.panel.data._Panel.items.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data._Panel.items - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data._Panel.items - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.data._Panel.major_axis.html b/devel/panel/panel/linearmodels.panel.data._Panel.major_axis.html
index 55d038156a..aa5d0a93de 100644
--- a/devel/panel/panel/linearmodels.panel.data._Panel.major_axis.html
+++ b/devel/panel/panel/linearmodels.panel.data._Panel.major_axis.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data._Panel.major_axis - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data._Panel.major_axis - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data._Panel.minor_axis.html b/devel/panel/panel/linearmodels.panel.data._Panel.minor_axis.html
index 2ae86dced5..963574f83d 100644
--- a/devel/panel/panel/linearmodels.panel.data._Panel.minor_axis.html
+++ b/devel/panel/panel/linearmodels.panel.data._Panel.minor_axis.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data._Panel.minor_axis - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data._Panel.minor_axis - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data._Panel.shape.html b/devel/panel/panel/linearmodels.panel.data._Panel.shape.html
index cf7cb0dc81..40d853c0ee 100644
--- a/devel/panel/panel/linearmodels.panel.data._Panel.shape.html
+++ b/devel/panel/panel/linearmodels.panel.data._Panel.shape.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data._Panel.shape - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data._Panel.shape - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data._Panel.to_frame.html b/devel/panel/panel/linearmodels.panel.data._Panel.to_frame.html
index b46e078590..b813e77b11 100644
--- a/devel/panel/panel/linearmodels.panel.data._Panel.to_frame.html
+++ b/devel/panel/panel/linearmodels.panel.data._Panel.to_frame.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data._Panel.to_frame - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data._Panel.to_frame - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.data._Panel.values.html b/devel/panel/panel/linearmodels.panel.data._Panel.values.html
index 884470914e..de0153951b 100644
--- a/devel/panel/panel/linearmodels.panel.data._Panel.values.html
+++ b/devel/panel/panel/linearmodels.panel.data._Panel.values.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.data._Panel.values - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.data._Panel.values - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.model.BetweenOLS.fit.html b/devel/panel/panel/linearmodels.panel.model.BetweenOLS.fit.html
index f52e37ca61..5630b23837 100644
--- a/devel/panel/panel/linearmodels.panel.model.BetweenOLS.fit.html
+++ b/devel/panel/panel/linearmodels.panel.model.BetweenOLS.fit.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.model.BetweenOLS.fit - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.model.BetweenOLS.fit - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.model.BetweenOLS.formula.html b/devel/panel/panel/linearmodels.panel.model.BetweenOLS.formula.html
index 3c6934b22a..e0292b11ed 100644
--- a/devel/panel/panel/linearmodels.panel.model.BetweenOLS.formula.html
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@@ -15,7 +15,7 @@
     
   
       
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+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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+            linearmodels v6.1 (+15)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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-            linearmodels v6.1 (+13)
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-    linearmodels v6.1 (+13)
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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+            linearmodels v6.1 (+15)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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+            linearmodels v6.1 (+15)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
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@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
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@@ -93,7 +93,7 @@
 
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-            linearmodels v6.1 (+13)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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-    linearmodels v6.1 (+13)
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-    linearmodels v6.1 (+13)
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
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+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.panel.results.FamaMacBethResults.all_params - linearmodels v6.1 (+15)</title>
       
     
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.avg_rsquared.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.avg_rsquared.html
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@@ -15,7 +15,7 @@
     
   
       
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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@@ -93,7 +93,7 @@
 
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@@ -15,7 +15,7 @@
     
   
       
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.entity_info.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.entity_info.html
index 4c678a1727..1b008b3c8f 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.entity_info.html
+++ b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.entity_info.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.entity_info - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.entity_info - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.estimated_effects.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.estimated_effects.html
index cfba7346c9..c067311d11 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.estimated_effects.html
+++ b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.estimated_effects.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.estimated_effects - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.estimated_effects - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.f_statistic.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.f_statistic.html
index 85b1188096..09833f09f7 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.f_statistic.html
+++ b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.f_statistic.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.f_statistic - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.f_statistic - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.f_statistic_robust.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.f_statistic_robust.html
index 085cdbac5e..ce7a09b1fe 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.f_statistic_robust.html
+++ b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.f_statistic_robust.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.f_statistic_robust - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.f_statistic_robust - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.fitted_values.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.fitted_values.html
index edc08a4e94..e5b7108e5b 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.fitted_values.html
+++ b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.fitted_values.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.fitted_values - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.fitted_values - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.html
index 7659751f0b..4c6791ea75 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.html
+++ b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.idiosyncratic.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.idiosyncratic.html
index 6952794578..d280ddede5 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.idiosyncratic.html
+++ b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.idiosyncratic.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.idiosyncratic - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.idiosyncratic - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.loglik.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.loglik.html
index 1267e2520a..64502b9fa2 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.loglik.html
+++ b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.loglik.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.loglik - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.loglik - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.model_ss.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.model_ss.html
index 6ed43bd3d8..986ad3f15f 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.model_ss.html
+++ b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.model_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.model_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.model_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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index 150c4a3816..cd7b825fa7 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.name.html
+++ b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.name.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.name - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.name - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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index 798165841c..f95ba89f05 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.nobs.html
+++ b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.nobs.html
@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.panel.results.FamaMacBethResults.nobs - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.params.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.params.html
index 480f1a6cff..d399363f4e 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.params.html
+++ b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.params.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.params - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.params - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.predict.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.predict.html
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--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.predict.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.predict - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.predict - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.pvalues.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.pvalues.html
index 08b01ca7bc..c04e912888 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.pvalues.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.pvalues - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.pvalues - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.resid_ss.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.resid_ss.html
index 00d0a8c767..5d36c02e65 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.resid_ss.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.resid_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.resid_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.resids.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.resids.html
index 2386fb8da1..a93fd9e274 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.resids.html
+++ b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.resids.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.resids - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.resids - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.rsquared.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.rsquared.html
index 35787c5df6..a5af57501a 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.rsquared.html
+++ b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.rsquared.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.rsquared - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.rsquared - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.rsquared_between.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.rsquared_between.html
index a238a3fb16..9cc7be21bc 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.rsquared_between.html
+++ b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.rsquared_between.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.rsquared_between - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.rsquared_between - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.rsquared_overall.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.rsquared_overall.html
index 6835c5596a..3a6c212307 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.rsquared_overall.html
+++ b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.rsquared_overall.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.rsquared_overall - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.rsquared_overall - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.rsquared_within.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.rsquared_within.html
index 3ca2ed0f72..594985d4bc 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.rsquared_within.html
+++ b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.rsquared_within.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.rsquared_within - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.rsquared_within - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.s2.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.s2.html
index 11ff829907..40440c1ae8 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.s2.html
+++ b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.s2.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.s2 - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.s2 - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.std_errors.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.std_errors.html
index 497cafb54d..895c90cf1a 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.std_errors.html
+++ b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.std_errors.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.std_errors - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.std_errors - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.summary.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.summary.html
index 3642768647..3064708248 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.summary.html
+++ b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.summary.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.summary - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.summary - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.time_info.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.time_info.html
index 475bdac436..8c244d9398 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.time_info.html
+++ b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.time_info.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.time_info - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.time_info - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.total_ss.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.total_ss.html
index 03fa4f8a7f..6ade6f5b27 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.total_ss.html
+++ b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.total_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.total_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.total_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.tstats.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.tstats.html
index 31beffb7e9..9af5a17b2b 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.tstats.html
+++ b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.tstats.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.tstats - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.tstats - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.wald_test.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.wald_test.html
index 1d8590bd4c..2cabfbe0fa 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.wald_test.html
+++ b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.wald_test.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.wald_test - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.wald_test - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.wresids.html b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.wresids.html
index c515c55966..557c89af4d 100644
--- a/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.wresids.html
+++ b/devel/panel/panel/linearmodels.panel.results.FamaMacBethResults.wresids.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.FamaMacBethResults.wresids - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.FamaMacBethResults.wresids - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.conf_int.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.conf_int.html
index 17f32468be..092a50a88f 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.conf_int.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.conf_int.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.conf_int - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.conf_int - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.corr_squared_between.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.corr_squared_between.html
index 892e423868..8546477dbd 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.corr_squared_between.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.corr_squared_between.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.corr_squared_between - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.corr_squared_between - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.corr_squared_overall.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.corr_squared_overall.html
index f5389a3a3c..09b6541b37 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.corr_squared_overall.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.corr_squared_overall.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.corr_squared_overall - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.corr_squared_overall - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.corr_squared_within.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.corr_squared_within.html
index e3d3acc102..55a4359323 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.corr_squared_within.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.corr_squared_within.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.corr_squared_within - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.corr_squared_within - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.cov.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.cov.html
index f12001fad8..043004f573 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.cov.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.cov.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.cov - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.cov - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.df_model.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.df_model.html
index 80d79404ab..41066f3ddd 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.df_model.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.df_model.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.df_model - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.df_model - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.df_resid.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.df_resid.html
index f180bbf0cf..dade84d745 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.df_resid.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.df_resid.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.df_resid - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.df_resid - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.entity_info.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.entity_info.html
index 73695c69b1..2e1f851dc0 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.entity_info.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.entity_info.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.entity_info - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.entity_info - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.estimated_effects.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.estimated_effects.html
index ae7bd533b5..1baaa5ee6e 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.estimated_effects.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.estimated_effects.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.estimated_effects - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.estimated_effects - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.f_pooled.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.f_pooled.html
index 6d633821a1..ca84b68d9e 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.f_pooled.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.f_pooled.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.f_pooled - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.f_pooled - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.f_statistic.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.f_statistic.html
index 435f1c0205..d04e4e44f7 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.f_statistic.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.f_statistic.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.f_statistic - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.f_statistic - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.f_statistic_robust.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.f_statistic_robust.html
index 08d77b89f6..4d3d81d443 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.f_statistic_robust.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.f_statistic_robust.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.f_statistic_robust - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.f_statistic_robust - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.fitted_values.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.fitted_values.html
index 6c4646e0b9..220026f8b1 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.fitted_values.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.fitted_values.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.fitted_values - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.fitted_values - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.html
index 698cca49b1..3824628d8e 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.idiosyncratic.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.idiosyncratic.html
index 7b3848ca0f..2581e07571 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.idiosyncratic.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.idiosyncratic.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.idiosyncratic - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.idiosyncratic - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.included_effects.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.included_effects.html
index ac7104a3de..c521a8449a 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.included_effects.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.included_effects.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.included_effects - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.included_effects - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.loglik.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.loglik.html
index 6494750068..272538f1a9 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.loglik.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.loglik.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.loglik - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.loglik - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.model_ss.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.model_ss.html
index 665b6eeb54..031c577184 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.model_ss.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.model_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.model_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.model_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.name.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.name.html
index c011d8e431..f26264e2c1 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.name.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.name.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.name - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.name - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.nobs.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.nobs.html
index 94f9515290..061a0b112b 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.nobs.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.nobs.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.nobs - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.nobs - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.other_info.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.other_info.html
index f3628567d7..48b9dd2a09 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.other_info.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.other_info.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.other_info - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.other_info - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.params.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.params.html
index 142db51f2c..80b15c970a 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.params.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.params.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.params - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.params - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.predict.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.predict.html
index a5b40a3465..17b7b40cd1 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.predict.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.predict.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.predict - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.predict - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.pvalues.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.pvalues.html
index 971d14144f..97780f855e 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.pvalues.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.pvalues.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.pvalues - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.pvalues - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.resid_ss.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.resid_ss.html
index 6b7c13a4f6..b30312c1ae 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.resid_ss.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.resid_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.resid_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.resid_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.resids.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.resids.html
index 260ece7d72..48925ee8cd 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.resids.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.resids.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.resids - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.resids - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.rsquared.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.rsquared.html
index 384c6dafb3..894aa802d2 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.rsquared.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.rsquared.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.rsquared - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.rsquared - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.rsquared_between.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.rsquared_between.html
index 1abd975088..5d1db80f28 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.rsquared_between.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.rsquared_between.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.rsquared_between - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.rsquared_between - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.rsquared_inclusive.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.rsquared_inclusive.html
index bec60ec10b..b98daad614 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.rsquared_inclusive.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.rsquared_inclusive.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.rsquared_inclusive - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.rsquared_inclusive - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.rsquared_overall.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.rsquared_overall.html
index 47b98714f6..9f338f305d 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.rsquared_overall.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.rsquared_overall.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.rsquared_overall - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.rsquared_overall - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.rsquared_within.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.rsquared_within.html
index 73720e1e22..c9a08ff546 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.rsquared_within.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.rsquared_within.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.rsquared_within - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.rsquared_within - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.s2.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.s2.html
index 894546ca0a..5e0e8ac93d 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.s2.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.s2.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.s2 - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.s2 - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.std_errors.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.std_errors.html
index 06f5fd9a90..8b0fb96dda 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.std_errors.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.std_errors.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.std_errors - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.std_errors - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.summary.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.summary.html
index eaac0d703c..0fc318cd3f 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.summary.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.summary.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.summary - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.summary - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.time_info.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.time_info.html
index 037c09c425..bfa2dfabaa 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.time_info.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.time_info.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.time_info - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.time_info - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.total_ss.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.total_ss.html
index e2250681d7..4aa2e5b50d 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.total_ss.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.total_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.total_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.total_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.tstats.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.tstats.html
index 0f4dc0fd88..65e161e54f 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.tstats.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.tstats.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.tstats - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.tstats - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.variance_decomposition.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.variance_decomposition.html
index 63e8b217b6..9bf6f6a4a1 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.variance_decomposition.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.variance_decomposition.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.variance_decomposition - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.variance_decomposition - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.wald_test.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.wald_test.html
index 5cb72917fe..c8dcc48829 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.wald_test.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.wald_test.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.wald_test - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.wald_test - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.wresids.html b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.wresids.html
index dfb61259f3..616d8af997 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.wresids.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelEffectsResults.wresids.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelEffectsResults.wresids - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelEffectsResults.wresids - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.cov_estimator.html b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.cov_estimator.html
index 5608694264..eacc3f2d76 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.cov_estimator.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.cov_estimator.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelModelComparison.cov_estimator - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelModelComparison.cov_estimator - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.estimator_method.html b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.estimator_method.html
index b033410348..026739ade2 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.estimator_method.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.estimator_method.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelModelComparison.estimator_method - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelModelComparison.estimator_method - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.f_statistic.html b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.f_statistic.html
index 44d51102a1..e6859a1aac 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.f_statistic.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.f_statistic.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelModelComparison.f_statistic - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelModelComparison.f_statistic - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.html b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.html
index 6213c34a08..5f91606abc 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelModelComparison - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelModelComparison - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.nobs.html b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.nobs.html
index 0446bc18a8..bd9c5d1586 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.nobs.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.nobs.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelModelComparison.nobs - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelModelComparison.nobs - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.params.html b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.params.html
index f4b7455ae7..a1b75a8f4d 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.params.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.params.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelModelComparison.params - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelModelComparison.params - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.pvalues.html b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.pvalues.html
index 46efeebbdb..3a1361b1ea 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.pvalues.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.pvalues.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelModelComparison.pvalues - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelModelComparison.pvalues - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.rsquared.html b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.rsquared.html
index 04a9f6d38b..36084e33aa 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.rsquared.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.rsquared.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelModelComparison.rsquared - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelModelComparison.rsquared - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.rsquared_between.html b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.rsquared_between.html
index f45736a2a3..1b3d2220cb 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.rsquared_between.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.rsquared_between.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelModelComparison.rsquared_between - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelModelComparison.rsquared_between - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.rsquared_overall.html b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.rsquared_overall.html
index 2a6d6a89b6..172e1243c4 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.rsquared_overall.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.rsquared_overall.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelModelComparison.rsquared_overall - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelModelComparison.rsquared_overall - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.rsquared_within.html b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.rsquared_within.html
index 629b169cca..209248745a 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.rsquared_within.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.rsquared_within.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelModelComparison.rsquared_within - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelModelComparison.rsquared_within - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.std_errors.html b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.std_errors.html
index de4a73504e..6bb8889459 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.std_errors.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.std_errors.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelModelComparison.std_errors - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelModelComparison.std_errors - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.summary.html b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.summary.html
index 2e3aecc62d..48a1db6256 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.summary.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.summary.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelModelComparison.summary - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelModelComparison.summary - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.tstats.html b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.tstats.html
index 1ec45ab81b..1f0fa7be3b 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.tstats.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelModelComparison.tstats.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelModelComparison.tstats - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelModelComparison.tstats - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.conf_int.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.conf_int.html
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--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.conf_int.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.conf_int - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.conf_int - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.corr_squared_between.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.corr_squared_between.html
index bb42354ff5..bde432e56e 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.corr_squared_between.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.corr_squared_between.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.corr_squared_between - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.corr_squared_between - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.corr_squared_overall.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.corr_squared_overall.html
index b4895f651f..22439110f3 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.corr_squared_overall.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.corr_squared_overall - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.corr_squared_overall - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.corr_squared_within.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.corr_squared_within.html
index 99f3b801d0..b8853d89fe 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.corr_squared_within.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.corr_squared_within - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.corr_squared_within - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.cov.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.cov.html
index f72c0ae5ba..997d9161b6 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.cov.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.cov.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.cov - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.cov - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.df_model.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.df_model.html
index 6fea5fd7b3..6aa6082b76 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.df_model.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.df_model.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.df_model - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.df_model - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.df_resid.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.df_resid.html
index 60e6bddba1..64b8f9f9ac 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.df_resid.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.df_resid.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.df_resid - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.df_resid - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.entity_info.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.entity_info.html
index 22dd56ec90..9111c75d3d 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.entity_info.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.entity_info.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.entity_info - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.entity_info - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.estimated_effects.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.estimated_effects.html
index 45b0f3023a..871de21c2e 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.estimated_effects.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.estimated_effects.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.estimated_effects - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.estimated_effects - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.f_statistic.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.f_statistic.html
index dcee209c5a..a38515b125 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.f_statistic.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.f_statistic.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.f_statistic - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.f_statistic - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.f_statistic_robust.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.f_statistic_robust.html
index aabfb2c6a7..c5a197d76b 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.f_statistic_robust.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.f_statistic_robust.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.f_statistic_robust - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.f_statistic_robust - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.fitted_values.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.fitted_values.html
index b1ea1df1d3..855f4feb40 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.fitted_values.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.fitted_values.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.fitted_values - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.fitted_values - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.html
index 515e10529f..83646ded20 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.idiosyncratic.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.idiosyncratic.html
index 5af82773bf..c20587c243 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.idiosyncratic.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.idiosyncratic.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.idiosyncratic - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.idiosyncratic - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.loglik.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.loglik.html
index 515cfd6a12..e28e518f55 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.loglik.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.loglik.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.loglik - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.loglik - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.model_ss.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.model_ss.html
index 1c1cfe41be..860df1ed87 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.model_ss.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.model_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.model_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.model_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.name.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.name.html
index 0f718a6784..fa1efd63ca 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.name.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.name.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.name - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.name - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.nobs.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.nobs.html
index cecd02d15f..19a7d76522 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.nobs.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.nobs.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.nobs - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.nobs - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.params.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.params.html
index eb08d23697..a428aa3468 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.params.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.params.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.params - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.params - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.predict.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.predict.html
index 10fe4c0d30..5d03f92e67 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.predict.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.predict.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.predict - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.predict - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.pvalues.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.pvalues.html
index 75a7dec7a3..6dc6386a97 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.pvalues.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.pvalues.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.pvalues - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.pvalues - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.resid_ss.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.resid_ss.html
index db239f6b26..b92933725b 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.resid_ss.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.resid_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.resid_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.resid_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.resids.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.resids.html
index 134d560227..ddf8f0a373 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.resids.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.resids.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.resids - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.resids - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.rsquared.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.rsquared.html
index 5038b61bf1..a9396b11cf 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.rsquared.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.rsquared.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.rsquared - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.rsquared - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.rsquared_between.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.rsquared_between.html
index f156ff33d4..3cb85dc53c 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.rsquared_between.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.rsquared_between.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.rsquared_between - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.rsquared_between - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.rsquared_overall.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.rsquared_overall.html
index 095c185faf..6d045aa5ee 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.rsquared_overall.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.rsquared_overall.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.rsquared_overall - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.rsquared_overall - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.rsquared_within.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.rsquared_within.html
index b602ced639..1f48e2446d 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.rsquared_within.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.rsquared_within.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.rsquared_within - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.rsquared_within - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.s2.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.s2.html
index 381d019e42..918d96e22d 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.s2.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.s2.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.s2 - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.s2 - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.std_errors.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.std_errors.html
index 8de487af68..054a6665d5 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.std_errors.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.std_errors.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.std_errors - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.std_errors - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.summary.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.summary.html
index a18b6d5094..ac89d8c89f 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.summary.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.summary.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.summary - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.summary - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.time_info.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.time_info.html
index 46a1ad3758..b8026410a4 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.time_info.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.time_info.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.time_info - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.time_info - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.total_ss.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.total_ss.html
index e90be4dc22..1722d1a13d 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.total_ss.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.total_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.total_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.total_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.tstats.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.tstats.html
index 1a26ecaead..2cc917fbc2 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.tstats.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.tstats.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.tstats - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.tstats - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.wald_test.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.wald_test.html
index 69d7752b07..52c5f6da54 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.wald_test.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.wald_test.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.wald_test - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.wald_test - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.PanelResults.wresids.html b/devel/panel/panel/linearmodels.panel.results.PanelResults.wresids.html
index 953ef02deb..bd1fae7fb4 100644
--- a/devel/panel/panel/linearmodels.panel.results.PanelResults.wresids.html
+++ b/devel/panel/panel/linearmodels.panel.results.PanelResults.wresids.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.PanelResults.wresids - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.PanelResults.wresids - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.conf_int.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.conf_int.html
index b43f4b8d87..fd80dc53db 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.conf_int.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.conf_int.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.conf_int - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.conf_int - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.corr_squared_between.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.corr_squared_between.html
index 56d7d96c0f..7e04797c6d 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.corr_squared_between.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.corr_squared_between.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.corr_squared_between - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.corr_squared_between - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.corr_squared_overall.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.corr_squared_overall.html
index bd759cf974..f3aaf078e4 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.corr_squared_overall.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.corr_squared_overall.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.corr_squared_overall - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.corr_squared_overall - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.corr_squared_within.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.corr_squared_within.html
index 3942af1143..edddbb0561 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.corr_squared_within.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.corr_squared_within.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.corr_squared_within - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.corr_squared_within - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.cov.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.cov.html
index 2d7f40e70a..72548322c9 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.cov.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.cov.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.cov - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.cov - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.df_model.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.df_model.html
index 8e13f00971..03c79021ac 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.df_model.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.df_model.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.df_model - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.df_model - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.df_resid.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.df_resid.html
index 6ebe4ce647..886f80c861 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.df_resid.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.df_resid.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.df_resid - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.df_resid - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.entity_info.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.entity_info.html
index 294cc307f0..047b11b3cc 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.entity_info.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.entity_info.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.entity_info - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.entity_info - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.estimated_effects.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.estimated_effects.html
index c063e88bf6..0bbd322426 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.estimated_effects.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.estimated_effects.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.estimated_effects - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.estimated_effects - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.f_statistic.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.f_statistic.html
index 89ea8ecb32..1de6520aee 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.f_statistic.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.f_statistic.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.f_statistic - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.f_statistic - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.f_statistic_robust.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.f_statistic_robust.html
index 8a0fea7ab9..24996584e4 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.f_statistic_robust.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.f_statistic_robust.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.f_statistic_robust - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.f_statistic_robust - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.fitted_values.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.fitted_values.html
index 68397e0df5..13b2a9aa3f 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.fitted_values.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.fitted_values.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.fitted_values - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.fitted_values - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
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@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.html
index 321105ba07..cc34b76f25 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.idiosyncratic.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.idiosyncratic.html
index cdcdfde537..d23c7c7070 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.idiosyncratic.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.idiosyncratic.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.idiosyncratic - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.idiosyncratic - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.loglik.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.loglik.html
index 9720705187..974b542576 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.loglik.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.loglik.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.loglik - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.loglik - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.model_ss.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.model_ss.html
index 8f2e2912aa..457f01b78e 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.model_ss.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.model_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.model_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.model_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.name.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.name.html
index 1bb6d10a5b..5e2aee1898 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.name.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.name.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.name - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.name - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.nobs.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.nobs.html
index b3fe8d5742..4fcdda50df 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.nobs.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.nobs.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.nobs - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.nobs - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.params.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.params.html
index 573bca6609..6de4dd359f 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.params.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.params.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.params - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.params - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.predict.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.predict.html
index 131054571e..abb7e14e01 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.predict.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.predict.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.predict - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.predict - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.pvalues.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.pvalues.html
index f2a3b6ecc4..e8c43d7554 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.pvalues.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.pvalues.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.pvalues - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.pvalues - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.resid_ss.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.resid_ss.html
index c8dc962fa5..72de766ee2 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.resid_ss.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.resid_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.resid_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.resid_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.resids.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.resids.html
index a226598033..2f56e0f226 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.resids.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.resids.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.resids - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.resids - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.rsquared.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.rsquared.html
index 05594e0f6e..70443b93fb 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.rsquared.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.rsquared.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.rsquared - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.rsquared - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.rsquared_between.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.rsquared_between.html
index a053a79258..21c5274cc9 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.rsquared_between.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.rsquared_between.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.rsquared_between - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.rsquared_between - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.rsquared_overall.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.rsquared_overall.html
index 4dc242f365..35ecf4d2d4 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.rsquared_overall.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.rsquared_overall.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.rsquared_overall - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.rsquared_overall - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.rsquared_within.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.rsquared_within.html
index 9b077ecebd..ad28420e39 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.rsquared_within.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.rsquared_within.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.rsquared_within - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.rsquared_within - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.s2.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.s2.html
index 7014057e5d..2735c3c4c1 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.s2.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.s2.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.s2 - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.s2 - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.std_errors.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.std_errors.html
index 0cf5034d20..c0bfbc5205 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.std_errors.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.std_errors.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.std_errors - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.std_errors - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.summary.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.summary.html
index f738f7dce4..9b47a54a9a 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.summary.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.summary.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.summary - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.summary - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.theta.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.theta.html
index ec042dd6e5..ed76384859 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.theta.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.theta.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.theta - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.theta - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.time_info.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.time_info.html
index 5d4d6b247e..ba5b230461 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.time_info.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.time_info.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.time_info - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.time_info - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.total_ss.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.total_ss.html
index eb179fd516..132ce42892 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.total_ss.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.total_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.total_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.total_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.tstats.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.tstats.html
index 0f3b09ce55..1dd560420a 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.tstats.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.tstats.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.tstats - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.tstats - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.variance_decomposition.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.variance_decomposition.html
index 46bf5c8abd..0da5e708e6 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.variance_decomposition.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.variance_decomposition - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.variance_decomposition - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.wald_test.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.wald_test.html
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--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.wald_test.html
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.panel.results.RandomEffectsResults.wald_test - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.wresids.html b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.wresids.html
index 759bc429c8..6a7cf70c49 100644
--- a/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.wresids.html
+++ b/devel/panel/panel/linearmodels.panel.results.RandomEffectsResults.wresids.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.RandomEffectsResults.wresids - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.RandomEffectsResults.wresids - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.results.compare.html b/devel/panel/panel/linearmodels.panel.results.compare.html
index 2fc38373e2..5be54f9ea5 100644
--- a/devel/panel/panel/linearmodels.panel.results.compare.html
+++ b/devel/panel/panel/linearmodels.panel.results.compare.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.results.compare - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.results.compare - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.utility.PanelModelData.clusters.html b/devel/panel/panel/linearmodels.panel.utility.PanelModelData.clusters.html
index aaabdf39a6..d6d6714764 100644
--- a/devel/panel/panel/linearmodels.panel.utility.PanelModelData.clusters.html
+++ b/devel/panel/panel/linearmodels.panel.utility.PanelModelData.clusters.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.utility.PanelModelData.clusters - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.utility.PanelModelData.clusters - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.utility.PanelModelData.count.html b/devel/panel/panel/linearmodels.panel.utility.PanelModelData.count.html
index 7b43eca1f0..b5b9642701 100644
--- a/devel/panel/panel/linearmodels.panel.utility.PanelModelData.count.html
+++ b/devel/panel/panel/linearmodels.panel.utility.PanelModelData.count.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.utility.PanelModelData.count - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.utility.PanelModelData.count - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/panel/panel/linearmodels.panel.utility.PanelModelData.data.html b/devel/panel/panel/linearmodels.panel.utility.PanelModelData.data.html
index e78204ca62..b3fccbb8b4 100644
--- a/devel/panel/panel/linearmodels.panel.utility.PanelModelData.data.html
+++ b/devel/panel/panel/linearmodels.panel.utility.PanelModelData.data.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.utility.PanelModelData.data - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.utility.PanelModelData.data - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.utility.PanelModelData.html b/devel/panel/panel/linearmodels.panel.utility.PanelModelData.html
index 93c560691b..72a556892e 100644
--- a/devel/panel/panel/linearmodels.panel.utility.PanelModelData.html
+++ b/devel/panel/panel/linearmodels.panel.utility.PanelModelData.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.utility.PanelModelData - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.utility.PanelModelData - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.utility.PanelModelData.index.html b/devel/panel/panel/linearmodels.panel.utility.PanelModelData.index.html
index 897ef5f311..979c3ac8f6 100644
--- a/devel/panel/panel/linearmodels.panel.utility.PanelModelData.index.html
+++ b/devel/panel/panel/linearmodels.panel.utility.PanelModelData.index.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.utility.PanelModelData.index - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.utility.PanelModelData.index - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.utility.PanelModelData.other_effects.html b/devel/panel/panel/linearmodels.panel.utility.PanelModelData.other_effects.html
index c42958da55..cf24dd13d2 100644
--- a/devel/panel/panel/linearmodels.panel.utility.PanelModelData.other_effects.html
+++ b/devel/panel/panel/linearmodels.panel.utility.PanelModelData.other_effects.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.utility.PanelModelData.other_effects - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.utility.PanelModelData.other_effects - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.utility.PanelModelData.weights.html b/devel/panel/panel/linearmodels.panel.utility.PanelModelData.weights.html
index a1783c719e..d1ba203704 100644
--- a/devel/panel/panel/linearmodels.panel.utility.PanelModelData.weights.html
+++ b/devel/panel/panel/linearmodels.panel.utility.PanelModelData.weights.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.utility.PanelModelData.weights - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.utility.PanelModelData.weights - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/panel/linearmodels.panel.utility.generate_panel_data.html b/devel/panel/panel/linearmodels.panel.utility.generate_panel_data.html
index 67f89b1aa5..a76f13f35c 100644
--- a/devel/panel/panel/linearmodels.panel.utility.generate_panel_data.html
+++ b/devel/panel/panel/linearmodels.panel.utility.generate_panel_data.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.panel.utility.generate_panel_data - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.panel.utility.generate_panel_data - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/panel/reference.html b/devel/panel/reference.html
index 16d6a55f8f..1d7a21673b 100644
--- a/devel/panel/reference.html
+++ b/devel/panel/reference.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Module Reference - linearmodels v6.1 (+13)</title>
+        <title>Module Reference - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/plan.html b/devel/plan.html
index d0713a208b..b8dd1fe459 100644
--- a/devel/plan.html
+++ b/devel/plan.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Module Plans - linearmodels v6.1 (+13)</title>
+        <title>Module Plans - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/py-modindex.html b/devel/py-modindex.html
index ed83ce88c3..460577b10e 100644
--- a/devel/py-modindex.html
+++ b/devel/py-modindex.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>None - linearmodels v6.1 (+13)</title>
+        <title>None - linearmodels v6.1 (+15)</title>
       
     
 
@@ -91,7 +91,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -101,7 +101,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -188,10 +188,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/references.html b/devel/references.html
index 013564c049..0c7f40ab2b 100644
--- a/devel/references.html
+++ b/devel/references.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>References - linearmodels v6.1 (+13)</title>
+        <title>References - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/searchindex.js b/devel/searchindex.js
index 4fd73b24ff..395019638d 100644
--- a/devel/searchindex.js
+++ b/devel/searchindex.js
@@ -1 +1 @@
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"linearmodels.iv.results.FirstStageResults", "exog", "First stage estimation results and diagnostics"], [267, 2, 2, "linearmodels.iv.results.FirstStageResults", "instr", "First stage estimation results and diagnostics"], [267, 2, 2, "linearmodels.iv.results.FirstStageResults", "weights", "First stage estimation results and diagnostics"]], "linearmodels.iv.results.IVGMMResults": [[272, 4, 1, 0, "c_stat", "C-test of endogeneity"], [273, 4, 1, 0, "conf_int", "Confidence interval construction"], [274, 3, 1, 0, "cov", "Estimated covariance of parameters"], [275, 3, 1, 0, "cov_config", "Parameter values from covariance estimator"], [276, 3, 1, 0, "cov_estimator", "Type of covariance estimator used to compute covariance"], [277, 3, 1, 0, "cov_type", "Covariance estimator used"], [278, 3, 1, 0, "debiased", "Flag indicating whether covariance uses a small-sample adjustment"], [279, 3, 1, 0, "df_model", "Model degree of freedom"], [280, 3, 1, 0, "df_resid", "Residual degree of freedom"], [281, 3, 1, 0, "f_statistic", "Model F-statistic"], [282, 3, 1, 0, "first_stage", "First stage regression results"], [283, 3, 1, 0, "fitted_values", "Fitted values"], [284, 3, 1, 0, "has_constant", "Flag indicating the model includes a constant or equivalent"], [285, 3, 1, 0, "idiosyncratic", "Idiosyncratic error"], [286, 3, 1, 0, "iterations", "Iterations used in GMM estimation"], [287, 3, 1, 0, "j_stat", "J-test of overidentifying restrictions"], [288, 3, 1, 0, "kappa", "k-class estimator value"], [289, 3, 1, 0, "method", "Method used to estimate model parameters"], [290, 3, 1, 0, "model_ss", "Residual sum of squares"], [291, 3, 1, 0, "nobs", "Number of observations"], [292, 3, 1, 0, "params", "Estimated parameters"], [293, 4, 1, 0, "predict", "In- and out-of-sample predictions"], [294, 3, 1, 0, "pvalues", "Parameter p-vals. Uses t(df_resid) if debiased is True, else normal"], [295, 3, 1, 0, "resid_ss", "Residual sum of squares"], [296, 3, 1, 0, "resids", "Estimated residuals"], [297, 3, 1, 0, "rsquared", "Coefficient of determination (R**2)"], [298, 3, 1, 0, "rsquared_adj", "Sample-size adjusted coefficient of determination (R**2)"], [299, 3, 1, 0, "s2", "Residual variance estimator"], [300, 3, 1, 0, "std_errors", "Estimated parameter standard errors"], [301, 3, 1, 0, "summary", "Model estimation summary."], [302, 3, 1, 0, "total_ss", "Total sum of squares"], [303, 3, 1, 0, "tstats", "Parameter t-statistics"], [304, 4, 1, 0, "wald_test", "Test linear equality constraints using a Wald test"], [305, 3, 1, 0, "weight_config", "Weighting matrix configuration used in estimation"], [306, 3, 1, 0, "weight_matrix", "Weight matrix used in the final-step GMM estimation"], [307, 3, 1, 0, "weight_type", "Weighting matrix method used in estimation"], [308, 3, 1, 0, "wresids", "Weighted estimated residuals"]], "linearmodels.iv.results.IVGMMResults.__init__": [[271, 2, 2, 0, "model", "The model used to estimate parameters."], [271, 2, 2, 0, "results", "A dictionary of results from the model estimation."]], "linearmodels.iv.results.IVGMMResults.c_stat": [[272, 2, 2, 0, "variables", "List of variables to test for exogeneity."]], "linearmodels.iv.results.IVGMMResults.conf_int": [[273, 2, 2, 0, "level", "Confidence level for interval"]], "linearmodels.iv.results.IVGMMResults.predict": [[293, 2, 2, 0, "data", "DataFrame to use for out-of-sample predictions when model was constructed using a formula."], [293, 2, 2, 0, "endog", "Endogenous values to use in out-of-sample prediction (nobs by nendog)"], [293, 2, 2, 0, "exog", "Exogenous values to use in out-of-sample prediction (nobs by nexog)"], [293, 2, 2, 0, "fitted", "Flag indicating whether to include the fitted values"], [293, 2, 2, 0, "idiosyncratic", "Flag indicating whether to include the estimated idiosyncratic shock"], [293, 2, 2, 0, "missing", "Flag indicating to adjust for dropped observations."]], "linearmodels.iv.results.IVGMMResults.wald_test": [[304, 2, 2, 0, "formula", "formulaic linear constraints."], [304, 2, 2, 0, "restriction", "q by nvar array containing linear weights to apply to parameters when forming the restrictions."], [304, 2, 2, 0, "value", "q element array containing the restricted values."]], "linearmodels.iv.results.IVModelComparison": [[310, 3, 1, 0, "cov_estimator", "Covariance estimator descriptions"], [311, 3, 1, 0, "estimator_method", "Estimation methods"], [312, 3, 1, 0, "f_statistic", "F-statistics and P-values"], [313, 3, 1, 0, "nobs", "Parameters for all models"], [314, 3, 1, 0, "params", "Parameters for all models"], [315, 3, 1, 0, "pvalues", "Parameter p-vals for all models"], [316, 3, 1, 0, "rsquared", "Coefficients of determination (R**2)"], [317, 3, 1, 0, "rsquared_adj", "Sample-size adjusted coefficients of determination (R**2)"], [318, 3, 1, 0, "std_errors", "Parameter standard errors for all models"], [319, 3, 1, 0, "summary", "Model estimation summary."], [320, 3, 1, 0, "tstats", "Parameter t-stats for all models"]], "linearmodels.iv.results.IVModelComparison.__init__": [[309, 2, 2, 0, "precision", "Estimator precision estimator to include in the comparison output. Default is \"tstats\"."], [309, 2, 2, 0, "results", "Set of results to compare."], [309, 2, 2, 0, "stars", "Add stars based on the p-value of the coefficient where 1, 2 and 3-stars correspond to p-values of 10%, 5% and 1%, respectively."]], "linearmodels.iv.results.IVResults": [[322, 3, 1, 0, "anderson_rubin", "Anderson-Rubin test of overidentifying restrictions"], [323, 3, 1, 0, "basmann", "Basmann's test of overidentifying restrictions"], [324, 3, 1, 0, "basmann_f", "Basmann's F test of overidentifying restrictions"], [325, 4, 1, 0, "conf_int", "Confidence interval construction"], [326, 3, 1, 0, "cov", "Estimated covariance of parameters"], [327, 3, 1, 0, "cov_config", "Parameter values from covariance estimator"], [328, 3, 1, 0, "cov_estimator", "Type of covariance estimator used to compute covariance"], [329, 3, 1, 0, "cov_type", "Covariance estimator used"], [330, 3, 1, 0, "debiased", "Flag indicating whether covariance uses a small-sample adjustment"], [331, 3, 1, 0, "df_model", "Model degree of freedom"], [332, 3, 1, 0, "df_resid", "Residual degree of freedom"], [333, 4, 1, 0, "durbin", "Durbin's test of exogeneity"], [334, 3, 1, 0, "f_statistic", "Model F-statistic"], [335, 3, 1, 0, "first_stage", "First stage regression results"], [336, 3, 1, 0, "fitted_values", "Fitted values"], [337, 3, 1, 0, "has_constant", "Flag indicating the model includes a constant or equivalent"], [338, 3, 1, 0, "idiosyncratic", "Idiosyncratic error"], [339, 3, 1, 0, "kappa", "k-class estimator value"], [340, 3, 1, 0, "method", "Method used to estimate model parameters"], [341, 3, 1, 0, "model_ss", "Residual sum of squares"], [342, 3, 1, 0, "nobs", "Number of observations"], [343, 3, 1, 0, "params", "Estimated parameters"], [344, 4, 1, 0, "predict", "In- and out-of-sample predictions"], [345, 3, 1, 0, "pvalues", "Parameter p-vals. Uses t(df_resid) if debiased is True, else normal"], [346, 3, 1, 0, "resid_ss", "Residual sum of squares"], [347, 3, 1, 0, "resids", "Estimated residuals"], [348, 3, 1, 0, "rsquared", "Coefficient of determination (R**2)"], [349, 3, 1, 0, "rsquared_adj", "Sample-size adjusted coefficient of determination (R**2)"], [350, 3, 1, 0, "s2", "Residual variance estimator"], [351, 3, 1, 0, "sargan", "Sargan test of overidentifying restrictions"], [352, 3, 1, 0, "std_errors", "Estimated parameter standard errors"], [353, 3, 1, 0, "summary", "Model estimation summary."], [354, 3, 1, 0, "total_ss", "Total sum of squares"], [355, 3, 1, 0, "tstats", "Parameter t-statistics"], [356, 4, 1, 0, "wald_test", "Test linear equality constraints using a Wald test"], [357, 3, 1, 0, "wooldridge_overid", "Wooldridge's score test of overidentification"], [358, 3, 1, 0, "wooldridge_regression", "Wooldridge's regression test of exogeneity"], [359, 3, 1, 0, "wooldridge_score", "Wooldridge's score test of exogeneity"], [360, 3, 1, 0, "wresids", "Weighted estimated residuals"], [361, 4, 1, 0, "wu_hausman", "Wu-Hausman test of exogeneity"]], "linearmodels.iv.results.IVResults.__init__": [[321, 2, 2, 0, "model", "The model used to estimate parameters."], [321, 2, 2, 0, "results", "A dictionary of results from the model estimation."]], "linearmodels.iv.results.IVResults.conf_int": [[325, 2, 2, 0, "level", "Confidence level for interval"]], "linearmodels.iv.results.IVResults.durbin": [[333, 2, 2, 0, "variables", "List of variables to test for exogeneity."]], "linearmodels.iv.results.IVResults.predict": [[344, 2, 2, 0, "data", "DataFrame to use for out-of-sample predictions when model was constructed using a formula."], [344, 2, 2, 0, "endog", "Endogenous values to use in out-of-sample prediction (nobs by nendog)"], [344, 2, 2, 0, "exog", "Exogenous values to use in out-of-sample prediction (nobs by nexog)"], [344, 2, 2, 0, "fitted", "Flag indicating whether to include the fitted values"], [344, 2, 2, 0, "idiosyncratic", "Flag indicating whether to include the estimated idiosyncratic shock"], [344, 2, 2, 0, "missing", "Flag indicating to adjust for dropped observations."]], "linearmodels.iv.results.IVResults.wald_test": [[356, 2, 2, 0, "formula", "formulaic linear constraints."], [356, 2, 2, 0, "restriction", "q by nvar array containing linear weights to apply to parameters when forming the restrictions."], [356, 2, 2, 0, "value", "q element array containing the restricted values."]], "linearmodels.iv.results.IVResults.wu_hausman": [[361, 2, 2, 0, "variables", "List of variables to test for exogeneity."]], "linearmodels.iv.results.OLSResults": [[363, 4, 1, 0, "conf_int", "Confidence interval construction"], [364, 3, 1, 0, "cov", "Estimated covariance of parameters"], [365, 3, 1, 0, "cov_config", "Parameter values from covariance estimator"], [366, 3, 1, 0, "cov_estimator", "Type of covariance estimator used to compute covariance"], [367, 3, 1, 0, "cov_type", "Covariance estimator used"], [368, 3, 1, 0, "debiased", "Flag indicating whether covariance uses a small-sample adjustment"], [369, 3, 1, 0, "df_model", "Model degree of freedom"], [370, 3, 1, 0, "df_resid", "Residual degree of freedom"], [371, 3, 1, 0, "f_statistic", "Model F-statistic"], [372, 3, 1, 0, "fitted_values", "Fitted values"], [373, 3, 1, 0, "has_constant", "Flag indicating the model includes a constant or equivalent"], [374, 3, 1, 0, "idiosyncratic", "Idiosyncratic error"], [375, 3, 1, 0, "kappa", "k-class estimator value"], [376, 3, 1, 0, "method", "Method used to estimate model parameters"], [377, 3, 1, 0, "model_ss", "Residual sum of squares"], [378, 3, 1, 0, "nobs", "Number of observations"], [379, 3, 1, 0, "params", "Estimated parameters"], [380, 4, 1, 0, "predict", "In- and out-of-sample predictions"], [381, 3, 1, 0, "pvalues", "Parameter p-vals. Uses t(df_resid) if debiased is True, else normal"], [382, 3, 1, 0, "resid_ss", "Residual sum of squares"], [383, 3, 1, 0, "resids", "Estimated residuals"], [384, 3, 1, 0, "rsquared", "Coefficient of determination (R**2)"], [385, 3, 1, 0, "rsquared_adj", "Sample-size adjusted coefficient of determination (R**2)"], [386, 3, 1, 0, "s2", "Residual variance estimator"], [387, 3, 1, 0, "std_errors", "Estimated parameter standard errors"], [388, 3, 1, 0, "summary", "Model estimation summary."], [389, 3, 1, 0, "total_ss", "Total sum of squares"], [390, 3, 1, 0, "tstats", "Parameter t-statistics"], [391, 4, 1, 0, "wald_test", "Test linear equality constraints using a Wald test"], [392, 3, 1, 0, "wresids", "Weighted estimated residuals"]], "linearmodels.iv.results.OLSResults.__init__": [[362, 2, 2, 0, "model", "The model used to estimate parameters."], [362, 2, 2, 0, "results", "A dictionary of results from the model estimation."]], "linearmodels.iv.results.OLSResults.conf_int": [[363, 2, 2, 0, "level", "Confidence level for interval"]], "linearmodels.iv.results.OLSResults.predict": [[380, 2, 2, 0, "data", "DataFrame to use for out-of-sample predictions when model was constructed using a formula."], [380, 2, 2, 0, "endog", "Endogenous values to use in out-of-sample prediction (nobs by nendog)"], [380, 2, 2, 0, "exog", "Exogenous values to use in out-of-sample prediction (nobs by nexog)"], [380, 2, 2, 0, "fitted", "Flag indicating whether to include the fitted values"], [380, 2, 2, 0, "idiosyncratic", "Flag indicating whether to include the estimated idiosyncratic shock"], [380, 2, 2, 0, "missing", "Flag indicating to adjust for dropped observations."]], "linearmodels.iv.results.OLSResults.wald_test": [[391, 2, 2, 0, "formula", "formulaic linear constraints."], [391, 2, 2, 0, "restriction", "q by nvar array containing linear weights to apply to parameters when forming the restrictions."], [391, 2, 2, 0, "value", "q element array containing the restricted values."]], "linearmodels.iv.results.compare": [[393, 2, 2, 0, "precision", "Estimator precision estimator to include in the comparison output. Default is \"tstats\"."], [393, 2, 2, 0, "results", "Set of results to compare."], [393, 2, 2, 0, "stars", "Add stars based on the p-value of the coefficient where 1, 2 and 3-stars correspond to p-values of 10%, 5% and 1%, respectively."]], "linearmodels.panel": [[711, 0, 0, 1, "covariance", ""], [711, 0, 0, 1, "data", ""], [711, 0, 0, 1, "model", ""], [711, 0, 0, 1, "results", ""], [711, 0, 0, 1, "utility", ""]], "linearmodels.panel.covariance": [[404, 1, 1, 0, "ACCovariance", "Autocorrelation robust covariance estimation"], [412, 1, 1, 0, "ClusteredCovariance", "One-way (Rogers) or two-way clustered covariance estimation"], [420, 1, 1, 0, "DriscollKraay", "Driscoll-Kraay heteroskedasticity-autocorrelation robust covariance estimation"], [428, 1, 1, 0, "FamaMacBethCovariance", "HAC estimator for Fama-MacBeth estimator"], [438, 1, 1, 0, "HeteroskedasticCovariance", "Covariance estimation using White estimator"], [446, 1, 1, 0, "HomoskedasticCovariance", "Homoskedastic covariance estimation"]], "linearmodels.panel.covariance.ACCovariance": [[405, 6, 1, 0, "ALLOWED_KWARGS", ""], [406, 6, 1, 0, "DEFAULT_KERNEL", ""], [407, 3, 1, 0, "cov", "Estimated covariance"], [408, 4, 1, 0, "deferred_cov", "Covariance calculation deferred until executed"], [409, 3, 1, 0, "eps", "Model residuals"], [410, 3, 1, 0, "name", "Covariance estimator name"], [411, 3, 1, 0, "s2", "Error variance"]], "linearmodels.panel.covariance.ACCovariance.__init__": [[404, 2, 2, 0, "bandwidth", "Non-negative integer to use as bandwidth."], [404, 2, 2, 0, "debiased", "Flag indicating whether to debias the estimator"], [404, 2, 2, 0, "entity_ids", "(entity x time) by 1 stacked array of entity ids"], [404, 2, 2, 0, "extra_df", "Additional degrees of freedom consumed by models beyond the number of columns in x, e.g., fixed effects."], [404, 2, 2, 0, "kernel", "Name of one of the supported kernels."], [404, 2, 2, 0, "params", "variables by 1 array of estimated model parameters"], [404, 2, 2, 0, "time_ids", "(entity x time) by 1 stacked array of time ids"], [404, 2, 2, 0, "x", "(entity x time) by variables stacked array of exogenous"], [404, 2, 2, 0, "y", "(entity x time) by 1 stacked array of dependent"]], "linearmodels.panel.covariance.ClusteredCovariance": [[413, 6, 1, 0, "ALLOWED_KWARGS", ""], [414, 6, 1, 0, "DEFAULT_KERNEL", ""], [415, 3, 1, 0, "cov", "Estimated covariance"], [416, 4, 1, 0, "deferred_cov", "Covariance calculation deferred until executed"], [417, 3, 1, 0, "eps", "Model residuals"], [418, 3, 1, 0, "name", "Covariance estimator name"], [419, 3, 1, 0, "s2", "Error variance"]], "linearmodels.panel.covariance.ClusteredCovariance.__init__": [[412, 2, 2, 0, "clusters", "nobs by 1 or nobs by 2 array of cluster group ids"], [412, 2, 2, 0, "debiased", "Flag indicating whether to debias the estimator"], [412, 2, 2, 0, "entity_ids", "(entity x time) by 1 stacked array of entity ids"], [412, 2, 2, 0, "extra_df", "Additional degrees of freedom consumed by models beyond the number of columns in x, e.g., fixed effects."], [412, 2, 2, 0, "group_debias", "Flag indicating whether to apply small-number of groups adjustment."], [412, 2, 2, 0, "params", "variables by 1 array of estimated model parameters"], [412, 2, 2, 0, "time_ids", "(entity x time) by 1 stacked array of time ids"], [412, 2, 2, 0, "x", "nobs by variables stacked array of exogenous"], [412, 2, 2, 0, "y", "nobs by 1 stacked array of dependent"]], "linearmodels.panel.covariance.DriscollKraay": [[421, 6, 1, 0, "ALLOWED_KWARGS", ""], [422, 6, 1, 0, "DEFAULT_KERNEL", ""], [423, 3, 1, 0, "cov", "Estimated covariance"], [424, 4, 1, 0, "deferred_cov", "Covariance calculation deferred until executed"], [425, 3, 1, 0, "eps", "Model residuals"], [426, 3, 1, 0, "name", "Covariance estimator name"], [427, 3, 1, 0, "s2", "Error variance"]], "linearmodels.panel.covariance.DriscollKraay.__init__": [[420, 2, 2, 0, "bandwidth", "Non-negative integer to use as bandwidth."], [420, 2, 2, 0, "debiased", "Flag indicating whether to debias the estimator"], [420, 2, 2, 0, "entity_ids", "(entity x time) by 1 stacked array of entity ids"], [420, 2, 2, 0, "extra_df", "Additional degrees of freedom consumed by models beyond the number of columns in x, e.g., fixed effects."], [420, 2, 2, 0, "kernel", "Name of one of the supported kernels."], [420, 2, 2, 0, "params", "variables by 1 array of estimated model parameters"], [420, 2, 2, 0, "time_ids", "(entity x time) by 1 stacked array of time ids"], [420, 2, 2, 0, "x", "(entity x time) by variables stacked array of exogenous"], [420, 2, 2, 0, "y", "(entity x time) by 1 stacked array of dependent"]], "linearmodels.panel.covariance.FamaMacBethCovariance": [[429, 6, 1, 0, "ALLOWED_KWARGS", ""], [430, 6, 1, 0, "DEFAULT_KERNEL", ""], [431, 3, 1, 0, "all_params", "The set of parameters estimated for each of the time periods"], [432, 3, 1, 0, "bandwidth", "Estimator bandwidth"], [433, 3, 1, 0, "cov", "Estimated covariance"], [434, 4, 1, 0, "deferred_cov", "Covariance calculation deferred until executed"], [435, 3, 1, 0, "eps", "Model residuals"], [436, 3, 1, 0, "name", "Covariance estimator name"], [437, 3, 1, 0, "s2", "Error variance"]], "linearmodels.panel.covariance.FamaMacBethCovariance.__init__": [[428, 2, 2, 0, "all_params", "(nobs by variables) array of all estimated model parameters"], [428, 2, 2, 0, "bandwidth", "Non-negative integer to use as bandwidth."], [428, 2, 2, 0, "debiased", "Flag indicating whether to debias the estimator."], [428, 2, 2, 0, "kernel", "Name of one of the supported kernels."], [428, 2, 2, 0, "params", "(variables by 1) array of estimated model parameters"], [428, 2, 2, 0, "x", "(entity x time) by variables stacked array of exogenous"], [428, 2, 2, 0, "y", "(entity x time) by 1 stacked array of dependent"]], "linearmodels.panel.covariance.HeteroskedasticCovariance": [[439, 6, 1, 0, "ALLOWED_KWARGS", ""], [440, 6, 1, 0, "DEFAULT_KERNEL", ""], [441, 3, 1, 0, "cov", "Estimated covariance"], [442, 4, 1, 0, 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column corresponding to the first entity or time period should be dropped"], [460, 2, 2, 0, "group", "Type of dummies to generate"]], "linearmodels.panel.data.PanelData.general_demean": [[464, 2, 2, 0, "groups", "Arrays with the same size containing group identifiers"], [464, 2, 2, 0, "weights", "Weights to use in the weighted demeaning"]], "linearmodels.panel.data.PanelData.mean": [[467, 2, 2, 0, "group", "Group to use in demeaning"], [467, 2, 2, 0, "weights", "Weights to implement weighted averaging"]], "linearmodels.panel.data._Panel": [[480, 4, 1, 0, "from_array", ""], [481, 3, 1, 0, "items", ""], [482, 3, 1, 0, "major_axis", ""], [483, 3, 1, 0, "minor_axis", ""], [484, 3, 1, 0, "shape", ""], [485, 4, 1, 0, "to_frame", ""], [486, 3, 1, 0, "values", ""]], "linearmodels.panel.data._Panel.__init__": [[479, 2, 2, 0, "df", "MultiIndex DataFrame containing floats"]], "linearmodels.panel.data._Panel.from_array": [[480, 2, 2, "linearmodels.panel.data._Panel.from_array", "items", ""], [480, 2, 2, "linearmodels.panel.data._Panel.from_array", "major_axis", ""], [480, 2, 2, "linearmodels.panel.data._Panel.from_array", "minor_axis", ""], [480, 2, 2, "linearmodels.panel.data._Panel.from_array", "values", ""]], "linearmodels.panel.model": [[487, 1, 1, 0, "BetweenOLS", "Between estimator for panel data"], [495, 1, 1, 0, "FamaMacBeth", "Pooled coefficient estimator for panel data"], [503, 1, 1, 0, "FirstDifferenceOLS", "First difference model for panel data"], [511, 1, 1, 0, "PanelOLS", "One- and two-way fixed effects estimator for panel data"], [522, 1, 1, 0, "PooledOLS", "Pooled coefficient estimator for panel data"], [530, 1, 1, 0, "RandomEffects", "One-way Random Effects model for panel data"]], "linearmodels.panel.model.BetweenOLS": [[488, 4, 1, 0, "fit", "Estimate model parameters"], [489, 3, 1, 0, "formula", "Formula used to construct the model"], [490, 4, 1, 0, "from_formula", "Create a model from a formula"], [491, 3, 1, 0, "has_constant", "Flag indicating the model a constant or implicit constant"], [492, 3, 1, 0, "not_null", "Locations of non-missing observations"], [493, 4, 1, 0, "predict", "Predict values for additional data"], [494, 4, 1, 0, "reformat_clusters", "Reformat cluster variables"]], "linearmodels.panel.model.BetweenOLS.__init__": [[487, 2, 2, "linearmodels.panel.model.BetweenOLS", "check_rank", "Between estimator for panel data"], [487, 2, 2, 0, "dependent", "Dependent (left-hand-side) variable (time by entity)"], [487, 2, 2, 0, "exog", "Exogenous or right-hand-side variables (variable by time by entity)."], [487, 2, 2, 0, "weights", "Weights to use in estimation."]], "linearmodels.panel.model.BetweenOLS.fit": [[488, 2, 2, 0, "cov_config", "Additional covariance-specific options."], [488, 2, 2, 0, "cov_type", "Name of covariance estimator."], [488, 2, 2, 0, "debiased", "Flag indicating whether to debiased the covariance estimator using a degree of freedom adjustment."], [488, 2, 2, 0, "reweight", "Flag indicating to reweight observations if the input data is unbalanced using a WLS estimator."]], "linearmodels.panel.model.BetweenOLS.from_formula": [[490, 2, 2, 0, "check_rank", "Flag indicating whether to perform a rank check on the exogenous variables to ensure that the model is identified."], [490, 2, 2, 0, "data", "Data structure that can be coerced into a PanelData."], [490, 2, 2, 0, "formula", "Formula to transform into model."], [490, 2, 2, 0, "weights", "Weights to use in estimation."]], "linearmodels.panel.model.BetweenOLS.predict": [[493, 2, 2, 0, "context", "Depth of use when evaluating formulas."], [493, 2, 2, 0, "data", "Values to use when making predictions from a model constructed from a formula"], [493, 2, 2, "linearmodels.panel.model.BetweenOLS.predict", "eval_env", "Predict values for additional data"], [493, 2, 2, 0, "exog", "Exogenous regressors (nobs by nvar)"], [493, 2, 2, 0, "params", "Model parameters (nvar by 1)"]], "linearmodels.panel.model.BetweenOLS.reformat_clusters": [[494, 2, 2, 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"linearmodels.panel.model.FirstDifferenceOLS", "check_rank", "First difference model for panel data"], [503, 2, 2, 0, "dependent", "Dependent (left-hand-side) variable (time by entity)"], [503, 2, 2, 0, "exog", "Exogenous or right-hand-side variables (variable by time by entity)."], [503, 2, 2, 0, "weights", "Weights to use in estimation."]], "linearmodels.panel.model.FirstDifferenceOLS.fit": [[504, 2, 2, 0, "cov_config", "Additional covariance-specific options."], [504, 2, 2, 0, "cov_type", "Name of covariance estimator."], [504, 2, 2, 0, "debiased", "Flag indicating whether to debiased the covariance estimator using a degree of freedom adjustment."]], "linearmodels.panel.model.FirstDifferenceOLS.from_formula": [[506, 2, 2, 0, "check_rank", "Flag indicating whether to perform a rank check on the exogenous variables to ensure that the model is identified."], [506, 2, 2, 0, "data", "Data structure that can be coerced into a PanelData."], [506, 2, 2, 0, "formula", "Formula to transform into model."], [506, 2, 2, 0, "weights", "Weights to use in estimation."]], "linearmodels.panel.model.FirstDifferenceOLS.predict": [[509, 2, 2, 0, "context", "Depth of use when evaluating formulas."], [509, 2, 2, 0, "data", "Values to use when making predictions from a model constructed from a formula"], [509, 2, 2, "linearmodels.panel.model.FirstDifferenceOLS.predict", "eval_env", "Predict values for additional data"], [509, 2, 2, 0, "exog", "Exogenous regressors (nobs by nvar)"], [509, 2, 2, 0, "params", "Model parameters (nvar by 1)"]], "linearmodels.panel.model.FirstDifferenceOLS.reformat_clusters": [[510, 2, 2, 0, "clusters", "Values to use for variance clustering"]], "linearmodels.panel.model.PanelOLS": [[512, 3, 1, 0, "entity_effects", "Flag indicating whether entity effects are included"], [513, 4, 1, 0, "fit", "Estimate model parameters"], [514, 3, 1, 0, "formula", "Formula used to construct the model"], [515, 4, 1, 0, "from_formula", "Create a model from a formula"], [516, 3, 1, 0, "has_constant", "Flag indicating the model a constant or implicit constant"], [517, 3, 1, 0, "not_null", "Locations of non-missing observations"], [518, 3, 1, 0, "other_effects", "Flag indicating whether other (generic) effects are included"], [519, 4, 1, 0, "predict", "Predict values for additional data"], [520, 4, 1, 0, "reformat_clusters", "Reformat cluster variables"], [521, 3, 1, 0, "time_effects", "Flag indicating whether time effects are included"]], "linearmodels.panel.model.PanelOLS.__init__": [[511, 2, 2, 0, "check_rank", "Flag indicating whether to perform a rank check on the exogenous variables to ensure that the model is identified."], [511, 2, 2, 0, "dependent", "Dependent (left-hand-side) variable (time by entity)."], [511, 2, 2, 0, "drop_absorbed", "Flag indicating whether to drop absorbed variables"], [511, 2, 2, 0, "entity_effects", "Flag whether to include entity (fixed) effects in the model"], [511, 2, 2, 0, "exog", "Exogenous or right-hand-side variables (variable by time by entity)."], [511, 2, 2, 0, "other_effects", "Category codes to use for any effects that are not entity or time effects."], [511, 2, 2, 0, "singletons", "Flag indicating whether to drop singleton observation"], [511, 2, 2, 0, "time_effects", "Flag whether to include time effects in the model"], [511, 2, 2, 0, "weights", "Weights to use in estimation."]], "linearmodels.panel.model.PanelOLS.fit": [[513, 2, 2, 0, "auto_df", "Flag indicating that the treatment of estimated effects in degree of freedom adjustment is automatically handled."], [513, 2, 2, 0, "count_effects", "Flag indicating that the covariance estimator should be adjusted to account for the estimation of effects in the model."], [513, 2, 2, 0, "cov_config", "Additional covariance-specific options."], [513, 2, 2, 0, "cov_type", "Name of covariance estimator."], [513, 2, 2, 0, "debiased", "Flag indicating whether to debiased the covariance estimator using a degree of freedom adjustment."], [513, 2, 2, 0, "low_memory", "Flag indicating whether to use a low-memory algorithm when a model contains two-way fixed effects."], [513, 2, 2, 0, "use_lsdv", "Flag indicating to use the Least Squares Dummy Variable estimator to eliminate effects."], [513, 2, 2, 0, "use_lsmr", "Flag indicating to use LSDV with the Sparse Equations and Least Squares estimator to eliminate the fixed effects."]], "linearmodels.panel.model.PanelOLS.from_formula": [[515, 2, 2, 0, "check_rank", "Flag indicating whether to perform a rank check on the exogenous variables to ensure that the model is identified."], [515, 2, 2, 0, "data", "Data structure that can be coerced into a PanelData."], [515, 2, 2, 0, "drop_absorbed", "Flag indicating whether to drop absorbed variables"], [515, 2, 2, 0, "formula", "Formula to transform into model."], [515, 2, 2, 0, "other_effects", "Category codes to use for any effects that are not entity or time effects."], [515, 2, 2, 0, "singletons", "Flag indicating whether to drop singleton observation"], [515, 2, 2, 0, "weights", "Weights to use in estimation."]], "linearmodels.panel.model.PanelOLS.predict": [[519, 2, 2, 0, "context", "Depth of use when evaluating formulas."], [519, 2, 2, 0, "data", "Values to use when making predictions from a model constructed from a formula"], [519, 2, 2, "linearmodels.panel.model.PanelOLS.predict", "eval_env", "Predict values for additional data"], [519, 2, 2, 0, "exog", "Exogenous regressors (nobs by nvar)"], [519, 2, 2, 0, "params", "Model parameters (nvar by 1)"]], "linearmodels.panel.model.PanelOLS.reformat_clusters": [[520, 2, 2, 0, "clusters", "Values to use for variance clustering"]], "linearmodels.panel.model.PooledOLS": [[523, 4, 1, 0, "fit", "Estimate model parameters"], [524, 3, 1, 0, "formula", "Formula used to construct the model"], [525, 4, 1, 0, "from_formula", "Create a model from a formula"], [526, 3, 1, 0, "has_constant", "Flag indicating the model a constant or implicit constant"], [527, 3, 1, 0, "not_null", "Locations of non-missing observations"], [528, 4, 1, 0, "predict", "Predict values for additional data"], [529, 4, 1, 0, "reformat_clusters", "Reformat cluster variables"]], "linearmodels.panel.model.PooledOLS.__init__": [[522, 2, 2, 0, "check_rank", "Flag indicating whether to perform a rank check on the exogenous variables to ensure that the model is identified."], [522, 2, 2, 0, "dependent", "Dependent (left-hand-side) variable (time by entity)"], [522, 2, 2, 0, "exog", "Exogenous or right-hand-side variables (variable by time by entity)."], [522, 2, 2, 0, "weights", "Weights to use in estimation."]], "linearmodels.panel.model.PooledOLS.fit": [[523, 2, 2, 0, "cov_config", "Additional covariance-specific options."], [523, 2, 2, 0, "cov_type", "Name of covariance estimator."], [523, 2, 2, 0, "debiased", "Flag indicating whether to debiased the covariance estimator using a degree of freedom adjustment."]], "linearmodels.panel.model.PooledOLS.from_formula": [[525, 2, 2, 0, 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"Name of covariance estimator (see notes)."], [531, 2, 2, 0, "debiased", "Flag indicating whether to debiased the covariance estimator using a degree of freedom adjustment."], [531, 2, 2, 0, "small_sample", "Apply a small-sample correction to the estimate of the variance of the random effect."]], "linearmodels.panel.model.RandomEffects.from_formula": [[533, 2, 2, 0, "check_rank", "Flag indicating whether to perform a rank check on the exogenous variables to ensure that the model is identified."], [533, 2, 2, 0, "data", "Data structure that can be coerced into a PanelData."], [533, 2, 2, 0, "formula", "Formula to transform into model."], [533, 2, 2, 0, "weights", "Weights to use in estimation."]], "linearmodels.panel.model.RandomEffects.predict": [[536, 2, 2, 0, "context", "Depth of use when evaluating formulas."], [536, 2, 2, 0, "data", "Values to use when making predictions from a model constructed from a formula"], [536, 2, 2, "linearmodels.panel.model.RandomEffects.predict", "eval_env", "Predict values for additional data"], [536, 2, 2, 0, "exog", "Exogenous regressors (nobs by nvar)"], [536, 2, 2, 0, "params", "Model parameters (nvar by 1)"]], "linearmodels.panel.model.RandomEffects.reformat_clusters": [[537, 2, 2, 0, "clusters", "Values to use for variance clustering"]], "linearmodels.panel.results": [[538, 1, 1, 0, "FamaMacBethResults", "Results container for Fama MacBeth panel data models"], [576, 1, 1, 0, "PanelEffectsResults", "Results container for panel data models that include effects"], [616, 1, 1, 0, "PanelModelComparison", "Comparison of multiple models"], [630, 1, 1, 0, "PanelResults", "Results container for panel data models that do not include effects"], [665, 1, 1, 0, "RandomEffectsResults", "Results container for random effect panel data models"], [702, 5, 1, 0, "compare", "Compare the results of multiple models"]], "linearmodels.panel.results.FamaMacBethResults": [[539, 3, 1, 0, "all_params", "The set of parameters estimated for each of the time periods"], [540, 3, 1, 0, "avg_adj_rsquared", "The average coefficient of determination, adjusted for sample size."], [541, 3, 1, 0, "avg_rsquared", "The average coefficient of determination"], [542, 4, 1, 0, "conf_int", "Confidence interval construction"], [543, 3, 1, 0, "corr_squared_between", "Between Coefficient of determination using squared correlation"], [544, 3, 1, 0, "corr_squared_overall", "Overall coefficient of determination using squared correlation"], [545, 3, 1, 0, "corr_squared_within", "Within coefficient of determination using squared correlation"], [546, 3, 1, 0, "cov", "Estimated covariance of parameters"], [547, 3, 1, 0, "df_model", "Model degree of freedom"], [548, 3, 1, 0, "df_resid", "Residual degree of freedom"], [549, 3, 1, 0, "entity_info", "Statistics on observations per entity"], [550, 3, 1, 0, "estimated_effects", "Estimated effects"], [551, 3, 1, 0, "f_statistic", "Joint test of significance for non-constant regressors"], [552, 3, 1, 0, "f_statistic_robust", "Joint test of significance for non-constant regressors"], [553, 3, 1, 0, "fitted_values", "Fitted values"], [554, 3, 1, 0, "idiosyncratic", "Idiosyncratic error"], [555, 3, 1, 0, "loglik", "Log-likelihood of model"], [556, 3, 1, 0, "model_ss", "Residual sum of squares"], [557, 3, 1, 0, "name", "Model name"], [558, 3, 1, 0, "nobs", "Number of observations used to estimate the model"], [559, 3, 1, 0, "params", "Estimated parameters"], [560, 4, 1, 0, "predict", "In- and out-of-sample predictions"], [561, 3, 1, 0, "pvalues", "Parameter p-vals. Uses t(df_resid) if debiased is True, else normal"], [562, 3, 1, 0, "resid_ss", "Residual sum of squares"], [563, 3, 1, 0, "resids", "Model residuals"], [564, 3, 1, 0, "rsquared", "Model Coefficient of determination"], [565, 3, 1, 0, "rsquared_between", "Between Coefficient of determination"], [566, 3, 1, 0, "rsquared_overall", "Overall coefficient of determination"], [567, 3, 1, 0, "rsquared_within", "Within coefficient of determination"], [568, 3, 1, 0, "s2", "Residual variance estimator"], [569, 3, 1, 0, "std_errors", "Estimated parameter standard errors"], [570, 3, 1, 0, "summary", "Model estimation summary."], [571, 3, 1, 0, "time_info", "Statistics on observations per time interval"], [572, 3, 1, 0, "total_ss", "Total sum of squares"], [573, 3, 1, 0, "tstats", "Parameter t-statistics"], [574, 4, 1, 0, "wald_test", "Test linear equality constraints using a Wald test"], [575, 3, 1, 0, "wresids", "Weighted model residuals"]], "linearmodels.panel.results.FamaMacBethResults.__init__": [[538, 2, 2, "linearmodels.panel.results.FamaMacBethResults", "res", "Results container for Fama MacBeth panel data models"]], "linearmodels.panel.results.FamaMacBethResults.conf_int": [[542, 2, 2, 0, "level", "Confidence level for interval"]], "linearmodels.panel.results.FamaMacBethResults.predict": [[560, 2, 2, 0, "data", "DataFrame to use for out-of-sample predictions when model was constructed using a formula."], [560, 2, 2, 0, "effects", "Flag indicating whether to include estimated effects"], [560, 2, 2, 0, "exog", "Exogenous values to use in out-of-sample prediction (nobs by nexog)"], [560, 2, 2, 0, "fitted", "Flag indicating whether to include the fitted values"], [560, 2, 2, 0, "idiosyncratic", "Flag indicating whether to include the estimated idiosyncratic shock"], [560, 2, 2, 0, "missing", "Flag indicating to adjust for dropped observations."]], "linearmodels.panel.results.FamaMacBethResults.wald_test": [[574, 2, 2, 0, "formula", "formulaic linear constraints."], [574, 2, 2, 0, "restriction", "q by nvar array containing linear weights to apply to parameters when forming the restrictions."], [574, 2, 2, 0, "value", "q element array containing the restricted values."]], "linearmodels.panel.results.PanelEffectsResults": [[577, 4, 1, 0, "conf_int", "Confidence interval construction"], [578, 3, 1, 0, "corr_squared_between", "Between Coefficient of determination using squared correlation"], [579, 3, 1, 0, "corr_squared_overall", "Overall coefficient of determination using squared correlation"], [580, 3, 1, 0, "corr_squared_within", "Within coefficient of determination using squared correlation"], [581, 3, 1, 0, "cov", "Estimated covariance of parameters"], [582, 3, 1, 0, "df_model", "Model degree of freedom"], [583, 3, 1, 0, "df_resid", "Residual degree of freedom"], [584, 3, 1, 0, "entity_info", "Statistics on observations per entity"], [585, 3, 1, 0, "estimated_effects", "Estimated effects"], [586, 3, 1, 0, "f_pooled", "Test that included effects are jointly zero."], [587, 3, 1, 0, "f_statistic", "Joint test of significance for non-constant regressors"], [588, 3, 1, 0, "f_statistic_robust", "Joint test of significance for non-constant regressors"], [589, 3, 1, 0, "fitted_values", "Fitted values"], [590, 3, 1, 0, "idiosyncratic", "Idiosyncratic error"], [591, 3, 1, 0, "included_effects", "List of effects included in the model"], [592, 3, 1, 0, "loglik", "Log-likelihood of model"], [593, 3, 1, 0, "model_ss", "Residual sum of squares"], [594, 3, 1, 0, "name", "Model name"], [595, 3, 1, 0, "nobs", "Number of observations used to estimate the model"], [596, 3, 1, 0, "other_info", "Statistics on observations per group for other effects"], [597, 3, 1, 0, "params", "Estimated parameters"], [598, 4, 1, 0, "predict", "In- and out-of-sample predictions"], [599, 3, 1, 0, "pvalues", "Parameter p-vals. Uses t(df_resid) if debiased is True, else normal"], [600, 3, 1, 0, "resid_ss", "Residual sum of squares"], [601, 3, 1, 0, "resids", "Model residuals"], [602, 3, 1, 0, "rsquared", "Model Coefficient of determination"], [603, 3, 1, 0, "rsquared_between", "Between Coefficient of determination"], [604, 3, 1, 0, "rsquared_inclusive", "Model Coefficient of determination including fit of included effects"], [605, 3, 1, 0, "rsquared_overall", "Overall coefficient of determination"], [606, 3, 1, 0, "rsquared_within", "Within coefficient of determination"], [607, 3, 1, 0, "s2", "Residual variance estimator"], [608, 3, 1, 0, "std_errors", "Estimated parameter standard errors"], [609, 3, 1, 0, "summary", "Model estimation summary."], [610, 3, 1, 0, "time_info", "Statistics on observations per time interval"], [611, 3, 1, 0, "total_ss", "Total sum of squares"], [612, 3, 1, 0, "tstats", "Parameter t-statistics"], [613, 3, 1, 0, "variance_decomposition", "Decomposition of total variance into effects and residuals"], [614, 4, 1, 0, "wald_test", "Test linear equality constraints using a Wald test"], [615, 3, 1, 0, "wresids", "Weighted model residuals"]], "linearmodels.panel.results.PanelEffectsResults.__init__": [[576, 2, 2, "linearmodels.panel.results.PanelEffectsResults", "res", "Results container for panel data models that include effects"]], "linearmodels.panel.results.PanelEffectsResults.conf_int": [[577, 2, 2, 0, "level", "Confidence level for interval"]], "linearmodels.panel.results.PanelEffectsResults.predict": [[598, 2, 2, 0, "data", "DataFrame to use for out-of-sample predictions when model was constructed using a formula."], [598, 2, 2, 0, "effects", "Flag indicating whether to include estimated effects"], [598, 2, 2, 0, "exog", "Exogenous values to use in out-of-sample prediction (nobs by nexog)"], [598, 2, 2, 0, "fitted", "Flag indicating whether to include the fitted values"], [598, 2, 2, 0, "idiosyncratic", "Flag indicating whether to include the estimated idiosyncratic shock"], [598, 2, 2, 0, "missing", "Flag indicating to adjust for dropped observations."]], "linearmodels.panel.results.PanelEffectsResults.wald_test": [[614, 2, 2, 0, "formula", "formulaic linear constraints."], [614, 2, 2, 0, "restriction", "q by nvar array containing linear weights to apply to parameters when forming the restrictions."], [614, 2, 2, 0, "value", "q element array containing the restricted values."]], "linearmodels.panel.results.PanelModelComparison": [[617, 3, 1, 0, "cov_estimator", "Covariance estimator descriptions"], [618, 3, 1, 0, "estimator_method", "Estimation methods"], [619, 3, 1, 0, "f_statistic", "F-statistics and P-values"], [620, 3, 1, 0, "nobs", "Parameters for all models"], [621, 3, 1, 0, "params", "Parameters for all models"], [622, 3, 1, 0, "pvalues", "Parameter p-vals for all models"], [623, 3, 1, 0, "rsquared", "Coefficients of determination (R**2)"], [624, 3, 1, 0, "rsquared_between", "Coefficients of determination (R**2)"], [625, 3, 1, 0, "rsquared_overall", "Coefficients of determination (R**2)"], [626, 3, 1, 0, "rsquared_within", "Coefficients of determination (R**2)"], [627, 3, 1, 0, "std_errors", "Parameter standard errors for all models"], [628, 3, 1, 0, "summary", "Model estimation summary."], [629, 3, 1, 0, "tstats", "Parameter t-stats for all models"]], "linearmodels.panel.results.PanelModelComparison.__init__": [[616, 2, 2, 0, "precision", "Estimator precision estimator to include in the comparison output. Default is \"tstats\"."], [616, 2, 2, 0, "results", "Set of results to compare."], [616, 2, 2, 0, "stars", "Add stars based on the p-value of the coefficient where 1, 2 and 3-stars correspond to p-values of 10%, 5% and 1%, respectively."]], "linearmodels.panel.results.PanelResults": [[631, 4, 1, 0, "conf_int", "Confidence interval construction"], [632, 3, 1, 0, "corr_squared_between", "Between Coefficient of determination using squared correlation"], [633, 3, 1, 0, "corr_squared_overall", "Overall coefficient of determination using squared correlation"], [634, 3, 1, 0, "corr_squared_within", "Within coefficient of determination using squared correlation"], [635, 3, 1, 0, "cov", "Estimated covariance of parameters"], [636, 3, 1, 0, "df_model", "Model degree of freedom"], [637, 3, 1, 0, "df_resid", "Residual degree of freedom"], [638, 3, 1, 0, "entity_info", "Statistics on observations per entity"], [639, 3, 1, 0, "estimated_effects", "Estimated effects"], [640, 3, 1, 0, "f_statistic", "Joint test of significance for non-constant regressors"], [641, 3, 1, 0, "f_statistic_robust", "Joint test of significance for non-constant regressors"], [642, 3, 1, 0, "fitted_values", "Fitted values"], [643, 3, 1, 0, "idiosyncratic", "Idiosyncratic error"], [644, 3, 1, 0, "loglik", "Log-likelihood of model"], [645, 3, 1, 0, "model_ss", "Residual sum of squares"], [646, 3, 1, 0, "name", "Model name"], [647, 3, 1, 0, "nobs", "Number of observations used to estimate the model"], [648, 3, 1, 0, "params", "Estimated parameters"], [649, 4, 1, 0, "predict", "In- and out-of-sample predictions"], [650, 3, 1, 0, "pvalues", "Parameter p-vals. Uses t(df_resid) if debiased is True, else normal"], [651, 3, 1, 0, "resid_ss", "Residual sum of squares"], [652, 3, 1, 0, "resids", "Model residuals"], [653, 3, 1, 0, "rsquared", "Model Coefficient of determination"], [654, 3, 1, 0, "rsquared_between", "Between Coefficient of determination"], [655, 3, 1, 0, "rsquared_overall", "Overall coefficient of determination"], [656, 3, 1, 0, "rsquared_within", "Within coefficient of determination"], [657, 3, 1, 0, "s2", "Residual variance estimator"], [658, 3, 1, 0, "std_errors", "Estimated parameter standard errors"], [659, 3, 1, 0, "summary", "Model estimation summary."], [660, 3, 1, 0, "time_info", "Statistics on observations per time interval"], [661, 3, 1, 0, "total_ss", "Total sum of squares"], [662, 3, 1, 0, "tstats", "Parameter t-statistics"], [663, 4, 1, 0, "wald_test", "Test linear equality constraints using a Wald test"], [664, 3, 1, 0, "wresids", "Weighted model residuals"]], "linearmodels.panel.results.PanelResults.__init__": [[630, 2, 2, "linearmodels.panel.results.PanelResults", "res", "Results container for panel data models that do not include effects"]], "linearmodels.panel.results.PanelResults.conf_int": [[631, 2, 2, 0, "level", "Confidence level for interval"]], "linearmodels.panel.results.PanelResults.predict": [[649, 2, 2, 0, "data", "DataFrame to use for out-of-sample predictions when model was constructed using a formula."], [649, 2, 2, 0, "effects", "Flag indicating whether to include estimated effects"], [649, 2, 2, 0, "exog", "Exogenous values to use in out-of-sample prediction (nobs by nexog)"], [649, 2, 2, 0, "fitted", "Flag indicating whether to include the fitted values"], [649, 2, 2, 0, "idiosyncratic", "Flag indicating whether to include the estimated idiosyncratic shock"], [649, 2, 2, 0, "missing", "Flag indicating to adjust for dropped observations."]], "linearmodels.panel.results.PanelResults.wald_test": [[663, 2, 2, 0, "formula", "formulaic linear constraints."], [663, 2, 2, 0, "restriction", "q by nvar array containing linear weights to apply to parameters when forming the restrictions."], [663, 2, 2, 0, "value", "q element array containing the restricted values."]], "linearmodels.panel.results.RandomEffectsResults": [[666, 4, 1, 0, "conf_int", "Confidence interval construction"], [667, 3, 1, 0, "corr_squared_between", "Between Coefficient of determination using squared correlation"], [668, 3, 1, 0, "corr_squared_overall", "Overall coefficient of determination using squared correlation"], [669, 3, 1, 0, "corr_squared_within", "Within coefficient of determination using squared correlation"], [670, 3, 1, 0, "cov", "Estimated covariance of parameters"], [671, 3, 1, 0, "df_model", "Model degree of freedom"], [672, 3, 1, 0, "df_resid", "Residual degree of freedom"], [673, 3, 1, 0, "entity_info", "Statistics on observations per entity"], [674, 3, 1, 0, "estimated_effects", "Estimated effects"], [675, 3, 1, 0, "f_statistic", "Joint test of significance for non-constant regressors"], [676, 3, 1, 0, "f_statistic_robust", "Joint test of significance for non-constant regressors"], [677, 3, 1, 0, "fitted_values", "Fitted values"], [678, 3, 1, 0, "idiosyncratic", "Idiosyncratic error"], [679, 3, 1, 0, "loglik", "Log-likelihood of model"], [680, 3, 1, 0, "model_ss", "Residual sum of squares"], [681, 3, 1, 0, "name", "Model name"], [682, 3, 1, 0, "nobs", "Number of observations used to estimate the model"], [683, 3, 1, 0, "params", "Estimated parameters"], [684, 4, 1, 0, "predict", "In- and out-of-sample predictions"], [685, 3, 1, 0, "pvalues", "Parameter p-vals. Uses t(df_resid) if debiased is True, else normal"], [686, 3, 1, 0, "resid_ss", "Residual sum of squares"], [687, 3, 1, 0, "resids", "Model residuals"], [688, 3, 1, 0, "rsquared", "Model Coefficient of determination"], [689, 3, 1, 0, "rsquared_between", "Between Coefficient of determination"], [690, 3, 1, 0, "rsquared_overall", "Overall coefficient of determination"], [691, 3, 1, 0, "rsquared_within", "Within coefficient of determination"], [692, 3, 1, 0, "s2", "Residual variance estimator"], [693, 3, 1, 0, "std_errors", "Estimated parameter standard errors"], [694, 3, 1, 0, "summary", "Model estimation summary."], [695, 3, 1, 0, "theta", "Values used in generalized demeaning"], [696, 3, 1, 0, "time_info", "Statistics on observations per time interval"], [697, 3, 1, 0, "total_ss", "Total sum of squares"], [698, 3, 1, 0, "tstats", "Parameter t-statistics"], [699, 3, 1, 0, "variance_decomposition", "Decomposition of total variance into effects and residuals"], [700, 4, 1, 0, "wald_test", "Test linear equality constraints using a Wald test"], [701, 3, 1, 0, "wresids", "Weighted model residuals"]], "linearmodels.panel.results.RandomEffectsResults.__init__": [[665, 2, 2, "linearmodels.panel.results.RandomEffectsResults", "res", "Results container for random effect panel data models"]], "linearmodels.panel.results.RandomEffectsResults.conf_int": [[666, 2, 2, 0, "level", "Confidence level for interval"]], "linearmodels.panel.results.RandomEffectsResults.predict": [[684, 2, 2, 0, "data", "DataFrame to use for out-of-sample predictions when model was constructed using a formula."], [684, 2, 2, 0, "effects", "Flag indicating whether to include estimated effects"], [684, 2, 2, 0, "exog", "Exogenous values to use in out-of-sample prediction (nobs by nexog)"], [684, 2, 2, 0, "fitted", "Flag indicating whether to include the fitted values"], [684, 2, 2, 0, "idiosyncratic", "Flag indicating whether to include the estimated idiosyncratic shock"], [684, 2, 2, 0, "missing", "Flag indicating to adjust for dropped observations."]], "linearmodels.panel.results.RandomEffectsResults.wald_test": [[700, 2, 2, 0, "formula", "formulaic linear constraints."], [700, 2, 2, 0, "restriction", "q by nvar array containing linear weights to apply to parameters when forming the restrictions."], [700, 2, 2, 0, "value", "q element array containing the restricted values."]], "linearmodels.panel.results.compare": [[702, 2, 2, 0, "precision", "Estimator precision estimator to include in the comparison output. Default is \"tstats\"."], [702, 2, 2, 0, "results", "Set of results to compare."], [702, 2, 2, 0, "stars", "Add stars based on the p-value of the coefficient where 1, 2 and 3-stars correspond to p-values of 10%, 5% and 1%, respectively."]], "linearmodels.panel.utility": [[703, 1, 1, 0, "PanelModelData", "Typed namedtuple to hold simulated panel data"], [710, 5, 1, 0, "generate_panel_data", "Simulate panel data for testing"]], "linearmodels.panel.utility.PanelModelData": [[704, 6, 1, 0, "clusters", "Alias for field number 3"], [705, 4, 1, 0, "count", "Return number of occurrences of value."], [706, 6, 1, 0, "data", "Alias for field number 0"], [707, 4, 1, 0, "index", "Return first index of value."], [708, 6, 1, 0, "other_effects", "Alias for field number 2"], [709, 6, 1, 0, "weights", "Alias for field number 1"]], "linearmodels.panel.utility.PanelModelData.__init__": [[703, 2, 2, 0, "clusters", "DataFrame containing cluster ids."], [703, 2, 2, 0, "data", "DataFrame containing the panel model's data"], [703, 2, 2, 0, "other_effects", "DataFrame containing the panel model's effects, excluding time and entity effects."], [703, 2, 2, 0, "weights", "DataFrame containing  the panel model's weights"]], "linearmodels.panel.utility.PanelModelData.count": [[705, 2, 2, "linearmodels.panel.utility.PanelModelData.count", "value", "Return number of occurrences of value."]], "linearmodels.panel.utility.PanelModelData.index": [[707, 2, 2, "linearmodels.panel.utility.PanelModelData.index", "start", "Return first index of value."], [707, 2, 2, "linearmodels.panel.utility.PanelModelData.index", "stop", "Return first index of value."], [707, 2, 2, "linearmodels.panel.utility.PanelModelData.index", "value", "Return first index of value."]], "linearmodels.panel.utility.generate_panel_data": [[710, 2, 2, 0, "const", "Flag indicating that the model should include a constant."], [710, 2, 2, 0, "missing", "The percentage of values that are missing."], [710, 2, 2, 0, "ncats", "The number of categories to use in other_effects and variance clusters."], [710, 2, 2, 0, "nentity", "The number of entities in the panel."], [710, 2, 2, 0, "nexog", "The number of explanatory variables in the dataset."], [710, 2, 2, 0, "ntime", "The number of time periods in the panel."], [710, 2, 2, 0, "other_effects", "The number of other effects generated."], [710, 2, 2, 0, "rng", "A NumPy RandomState instance."]], "linearmodels.shared.covariance": [[868, 5, 1, 0, "cov_cluster", "Core cluster covariance estimator"], [869, 5, 1, 0, "cov_kernel", "Core kernel covariance estimator"], [870, 5, 1, 0, "group_debias_coefficient", "Compute the group debiasing scale."]], "linearmodels.shared.covariance.cov_cluster": [[868, 2, 2, 0, "clusters", "n by 1 array"], [868, 2, 2, 0, "z", "n by k mean zero data array"]], "linearmodels.shared.covariance.cov_kernel": [[869, 2, 2, 0, "w", "m by 1"], [869, 2, 2, 0, "z", "n by k mean zero data array"]], "linearmodels.shared.covariance.group_debias_coefficient": [[870, 2, 2, 0, "clusters", "One-dimensional array containing cluster group membership."]], "linearmodels.shared.hypotheses": [[871, 1, 1, 0, "InvalidTestStatistic", "Class returned if a requested test is not valid for a model"], [876, 1, 1, 0, "WaldTestStatistic", "Test statistic holder for Wald-type tests"]], "linearmodels.shared.hypotheses.InvalidTestStatistic": [[872, 3, 1, 0, "critical_values", "Always returns None"], [873, 3, 1, 0, "null", "Null hypothesis"], [874, 3, 1, 0, "pval", "Always returns np.nan"], [875, 3, 1, 0, "stat", "Test statistic"]], "linearmodels.shared.hypotheses.InvalidTestStatistic.__init__": [[871, 2, 2, 0, "name", "Name of test"], [871, 2, 2, 0, "reason", "Explanation why test is invalid"]], "linearmodels.shared.hypotheses.WaldTestStatistic": [[877, 3, 1, 0, "critical_values", "Critical values test for common test sizes"], [878, 3, 1, 0, "null", "Null hypothesis"], [879, 3, 1, 0, "pval", "P-value of test statistic"], [880, 3, 1, 0, "stat", "Test statistic"]], "linearmodels.shared.hypotheses.WaldTestStatistic.__init__": [[876, 2, 2, 0, "df", "Degree of freedom."], [876, 2, 2, 0, "df_denom", "Numerator degree of freedom."], [876, 2, 2, 0, "name", "Name of test"], [876, 2, 2, 0, "null", "A statement of the test's null hypothesis"], [876, 2, 2, 0, "stat", "The test statistic"]], "linearmodels.shared.utility": [[881, 1, 1, 0, "AttrDict", "Ordered dictionary-like object that exposes keys as attributes"]], "linearmodels.shared.utility.AttrDict": [[882, 4, 1, 0, "clear", "Remove all items from AD."], [883, 4, 1, 0, "copy", "Create a shallow copy of AD"], [884, 4, 1, 0, "get", ""], [885, 4, 1, 0, "items", "Return an ordered list-like object providing a view on AD's items"], [886, 4, 1, 0, "keys", "Return an ordered list-like object providing a view on AD's keys"], [887, 4, 1, 0, "pop", "Remove specified key and return the corresponding value. If key is not found, default is returned if given, otherwise KeyError is raised"], [888, 4, 1, 0, "popitem", "as a 2-tuple; but raise KeyError if D is empty."], [889, 4, 1, 0, "setdefault", ""], [890, 4, 1, 0, "update", "Update AD from dictionary or iterable E and F. If E is present and has a .keys() method, then does:  for k in E: AD[k] = E[k] If E is present and lacks a .keys() method, then does:  for k, v in E: AD[k] = v In either case, this is followed by: for k in F:  AD[k] = F[k]"], [891, 4, 1, 0, "values", "Return an ordered list-like object object providing a view on AD's values"]], "linearmodels.shared.utility.AttrDict.__init__": [[881, 2, 2, "linearmodels.shared.utility.AttrDict", "args", "Ordered dictionary-like object that exposes keys as attributes"], [881, 2, 2, "linearmodels.shared.utility.AttrDict", "kwargs", "Ordered dictionary-like object that exposes keys as attributes"]], "linearmodels.shared.utility.AttrDict.get": [[884, 2, 2, "linearmodels.shared.utility.AttrDict.get", "d", ""], [884, 2, 2, "linearmodels.shared.utility.AttrDict.get", "k", ""]], "linearmodels.shared.utility.AttrDict.pop": [[887, 2, 2, "linearmodels.shared.utility.AttrDict.pop", "default", "Remove specified key and return the corresponding value. If key is not found, default is returned if given, otherwise KeyError is raised"], [887, 2, 2, "linearmodels.shared.utility.AttrDict.pop", "key", "Remove specified key and return the corresponding value. If key is not found, default is returned if given, otherwise KeyError is raised"]], "linearmodels.shared.utility.AttrDict.setdefault": [[889, 2, 2, "linearmodels.shared.utility.AttrDict.setdefault", "d", ""], [889, 2, 2, "linearmodels.shared.utility.AttrDict.setdefault", "k", ""]], "linearmodels.shared.utility.AttrDict.update": [[890, 2, 2, "linearmodels.shared.utility.AttrDict.update", "args", "Update AD from dictionary or iterable E and F. If E is present and has a .keys() method, then does:  for k in E: AD[k] = E[k] If E is present and lacks a .keys() method, then does:  for k, v in E: AD[k] = v In either case, this is followed by: for k in F:  AD[k] = F[k]"], [890, 2, 2, "linearmodels.shared.utility.AttrDict.update", "kwargs", "Update AD from dictionary or iterable E and F. If E is present and has a .keys() method, then does:  for k in E: AD[k] = E[k] If E is present and lacks a .keys() method, then does:  for k, v in E: AD[k] = v In either case, this is followed by: for k in F:  AD[k] = F[k]"]], "linearmodels.system": [[719, 0, 0, 1, "covariance", ""], [719, 0, 0, 1, "gmm", ""], [719, 0, 0, 1, "model", ""], [719, 0, 0, 1, "results", ""]], "linearmodels.system.covariance": [[720, 1, 1, 0, "ClusteredCovariance", "Heteroskedastic covariance estimation for system regression"], [724, 1, 1, 0, "GMMHeteroskedasticCovariance", "Covariance estimator for IV system estimation with homoskedastic data"], [727, 1, 1, 0, "GMMHomoskedasticCovariance", "Covariance estimator for IV system estimation with homoskedastic data"], [730, 1, 1, 0, "GMMKernelCovariance", "Covariance estimator for IV system estimation with homoskedastic data"], [735, 1, 1, 0, "HeteroskedasticCovariance", "Heteroskedastic covariance estimation for system regression"], [739, 1, 1, 0, "HomoskedasticCovariance", "Homoskedastic covariance estimation for system regression"], [743, 1, 1, 0, "KernelCovariance", "Kernel (HAC) covariance estimation for system regression"]], "linearmodels.system.covariance.ClusteredCovariance": [[721, 3, 1, 0, "cov", "Parameter covariance"], [722, 3, 1, 0, "cov_config", "Optional configuration information used in covariance"], [723, 3, 1, 0, "sigma", "Error covariance"]], "linearmodels.system.covariance.ClusteredCovariance.__init__": [[720, 2, 2, 0, "clusters", "Optional array of cluster id."], [720, 2, 2, 0, "constraints", "Constraints used in estimation, if any"], [720, 2, 2, 0, "debiased", "Flag indicating to apply a small sample adjustment"], [720, 2, 2, 0, "eps", "Model residuals, ndependent by nobs"], [720, 2, 2, "linearmodels.system.covariance.ClusteredCovariance", "full_sigma", "Heteroskedastic covariance estimation for system regression"], [720, 2, 2, 0, "gls", "Flag indicating to compute the GLS covariance estimator."], [720, 2, 2, 0, "group_debias", "Flag indicating whether to debias by the number of groups."], [720, 2, 2, 0, "sigma", "Covariance matrix estimator of eps"], [720, 2, 2, 0, "x", "ndependent element list of regressor"]], "linearmodels.system.covariance.GMMHeteroskedasticCovariance": [[725, 3, 1, 0, "cov", "Parameter covariance"], [726, 3, 1, 0, "cov_config", "Optional configuration information used in covariance"]], "linearmodels.system.covariance.GMMHeteroskedasticCovariance.__init__": [[724, 2, 2, 0, "constraints", "Constraints used in estimation, if any"], [724, 2, 2, "linearmodels.system.covariance.GMMHeteroskedasticCovariance", "debiased", "Covariance estimator for IV system estimation with homoskedastic data"], [724, 2, 2, 0, "eps", "nobs by neq array of residuals where each column corresponds an equation in the system"], [724, 2, 2, 0, "sigma", "Residual covariance used in estimation"], [724, 2, 2, 0, "w", "Weighting matrix used in estimation"], [724, 2, 2, 0, "x", "List containing the model regressors for each equation in the system"], [724, 2, 2, 0, "z", "List containing the model instruments for each equation in the system"]], "linearmodels.system.covariance.GMMHomoskedasticCovariance": [[728, 3, 1, 0, "cov", "Parameter covariance"], [729, 3, 1, 0, "cov_config", "Optional configuration information used in covariance"]], "linearmodels.system.covariance.GMMHomoskedasticCovariance.__init__": [[727, 2, 2, 0, "constraints", "Constraints used in estimation, if any"], [727, 2, 2, "linearmodels.system.covariance.GMMHomoskedasticCovariance", "debiased", "Covariance estimator for IV system estimation with homoskedastic data"], [727, 2, 2, 0, "eps", "nobs by neq array of residuals where each column corresponds an equation in the system"], [727, 2, 2, 0, "sigma", "Residual covariance used in estimation"], [727, 2, 2, 0, "w", "Weighting matrix used in estimation"], [727, 2, 2, 0, "x", "List containing the model regressors for each equation in the system"], [727, 2, 2, 0, "z", "List containing the model instruments for each equation in the system"]], "linearmodels.system.covariance.GMMKernelCovariance": [[731, 3, 1, 0, "bandwidth", "Bandwidth used in estimation"], [732, 3, 1, 0, "cov", "Parameter covariance"], [733, 3, 1, 0, "cov_config", "Optional configuration information used in covariance"], [734, 3, 1, 0, "kernel", "Kernel used in estimation"]], "linearmodels.system.covariance.GMMKernelCovariance.__init__": [[730, 2, 2, 0, "bandwidth", "Bandwidth to use for the kernel."], [730, 2, 2, 0, "constraints", "Constraints used in estimation, if any"], [730, 2, 2, "linearmodels.system.covariance.GMMKernelCovariance", "debiased", "Covariance estimator for IV system estimation with homoskedastic data"], [730, 2, 2, 0, "eps", "nobs by neq array of residuals where each column corresponds an equation in the system"], [730, 2, 2, 0, "kernel", "Name of kernel to use."], [730, 2, 2, 0, "sigma", "Residual covariance used in estimation"], [730, 2, 2, 0, "w", "Weighting matrix used in estimation"], [730, 2, 2, 0, "x", "List containing the model regressors for each equation in the system"], [730, 2, 2, 0, "z", "List containing the model instruments for each equation in the system"]], "linearmodels.system.covariance.HeteroskedasticCovariance": [[736, 3, 1, 0, "cov", "Parameter covariance"], [737, 3, 1, 0, "cov_config", "Optional configuration information used in covariance"], [738, 3, 1, 0, "sigma", "Error covariance"]], "linearmodels.system.covariance.HeteroskedasticCovariance.__init__": [[735, 2, 2, 0, "constraints", "Constraints used in estimation, if any"], [735, 2, 2, 0, "debiased", "Flag indicating to apply a small sample adjustment"], [735, 2, 2, 0, "eps", "Model residuals, ndependent by nobs"], [735, 2, 2, "linearmodels.system.covariance.HeteroskedasticCovariance", "full_sigma", "Heteroskedastic covariance estimation for system regression"], [735, 2, 2, 0, "gls", "Flag indicating to compute the GLS covariance estimator."], [735, 2, 2, 0, "sigma", "Covariance matrix estimator of eps"], [735, 2, 2, 0, "x", "ndependent element list of regressor"]], "linearmodels.system.covariance.HomoskedasticCovariance": [[740, 3, 1, 0, "cov", "Parameter covariance"], [741, 3, 1, 0, "cov_config", "Optional configuration information used in covariance"], [742, 3, 1, 0, "sigma", "Error covariance"]], "linearmodels.system.covariance.HomoskedasticCovariance.__init__": [[739, 2, 2, 0, "constraints", "Constraints used in estimation, if any"], [739, 2, 2, 0, "debiased", "Flag indicating to apply a small sample adjustment"], [739, 2, 2, 0, "eps", "Model residuals, ndependent by nobs"], [739, 2, 2, "linearmodels.system.covariance.HomoskedasticCovariance", "full_sigma", "Homoskedastic covariance estimation for system regression"], [739, 2, 2, 0, "gls", "Flag indicating to compute the GLS covariance estimator."], [739, 2, 2, 0, "sigma", "Covariance matrix estimator of eps"], [739, 2, 2, 0, "x", "List of regressor arrays (ndependent)"]], "linearmodels.system.covariance.KernelCovariance": [[744, 3, 1, 0, "bandwidth", "Bandwidth used in estimation"], [745, 3, 1, 0, "cov", "Parameter covariance"], [746, 3, 1, 0, "cov_config", "Optional configuration information used in covariance"], [747, 3, 1, 0, "kernel", "Kernel used in estimation"], [748, 3, 1, 0, "sigma", "Error covariance"]], "linearmodels.system.covariance.KernelCovariance.__init__": [[743, 2, 2, 0, "bandwidth", "Bandwidth to use for the kernel."], [743, 2, 2, "linearmodels.system.covariance.KernelCovariance", "constraints", "Kernel (HAC) covariance estimation for system regression"], [743, 2, 2, 0, "debiased", "Flag indicating to apply a small sample adjustment"], [743, 2, 2, 0, "eps", "Model residuals, ndependent by nobs"], [743, 2, 2, "linearmodels.system.covariance.KernelCovariance", "full_sigma", "Kernel (HAC) covariance estimation for system regression"], [743, 2, 2, 0, "gls", "Flag indicating to compute the GLS covariance estimator."], [743, 2, 2, 0, "kernel", "Name of kernel to use."], [743, 2, 2, 0, "sigma", "Covariance matrix estimator of eps"], [743, 2, 2, 0, "x", "ndependent element list of regressor"]], "linearmodels.system.gmm": [[749, 1, 1, 0, "HeteroskedasticWeightMatrix", "Heteroskedasticity robust weight estimation"], [753, 1, 1, 0, "HomoskedasticWeightMatrix", "Homoskedastic (unadjusted) weight estimation"], [757, 1, 1, 0, "KernelWeightMatrix", "Heteroskedasticity robust weight estimation"]], "linearmodels.system.gmm.HeteroskedasticWeightMatrix": [[750, 3, 1, 0, "config", "Weight estimator configuration"], [751, 4, 1, 0, "sigma", "Estimate residual covariance."], [752, 4, 1, 0, "weight_matrix", "Construct a GMM weight matrix for a model."]], "linearmodels.system.gmm.HeteroskedasticWeightMatrix.__init__": [[749, 2, 2, 0, "center", "Flag indicating whether to center the moment conditions by subtracting the mean before computing the weight matrix."], [749, 2, 2, 0, "debiased", "Flag indicating whether to use small-sample adjustments"]], "linearmodels.system.gmm.HeteroskedasticWeightMatrix.sigma": [[751, 2, 2, 0, "eps", "The residuals from the system of equations."], [751, 2, 2, 0, "x", "A list of the regressor matrices for each equation in the system."]], "linearmodels.system.gmm.HeteroskedasticWeightMatrix.weight_matrix": [[752, 2, 2, 0, "eps", "Model errors (nobs by 1)"], [752, 2, 2, 0, "sigma", "Fixed covariance of model errors."], [752, 2, 2, 0, "x", "Model regressors (exog and endog), (nobs by nvar)"], [752, 2, 2, 0, "z", "Model instruments (exog and instruments), (nobs by ninstr)"]], "linearmodels.system.gmm.HomoskedasticWeightMatrix": [[754, 3, 1, 0, "config", "Weight estimator configuration"], [755, 4, 1, 0, "sigma", "Estimate residual covariance."], [756, 4, 1, 0, "weight_matrix", "Construct a GMM weight matrix for a model."]], "linearmodels.system.gmm.HomoskedasticWeightMatrix.__init__": [[753, 2, 2, 0, "center", "Flag indicating whether to center the moment conditions by subtracting the mean before computing the weight matrix."], [753, 2, 2, 0, "debiased", "Flag indicating whether to use small-sample adjustments"]], "linearmodels.system.gmm.HomoskedasticWeightMatrix.sigma": [[755, 2, 2, 0, "eps", "The residuals from the system of equations."], [755, 2, 2, 0, "x", "A list of the regressor matrices for each equation in the system."]], "linearmodels.system.gmm.HomoskedasticWeightMatrix.weight_matrix": [[756, 2, 2, 0, "eps", "Model errors (nobs by neqn)"], [756, 2, 2, 0, "sigma", "Fixed covariance of model errors."], [756, 2, 2, 0, "x", "List of containing model regressors for each equation in the system"], [756, 2, 2, 0, "z", "List of containing instruments for each equation in the system"]], "linearmodels.system.gmm.KernelWeightMatrix": [[758, 3, 1, 0, "bandwidth", "Bandwidth used to estimate covariance of moment conditions"], [759, 3, 1, 0, "config", "Weight estimator configuration"], [760, 3, 1, 0, "kernel", "Kernel used in estimation"], [761, 4, 1, 0, "sigma", "Estimate residual covariance."], [762, 4, 1, 0, "weight_matrix", "Construct a GMM weight matrix for a model."]], "linearmodels.system.gmm.KernelWeightMatrix.__init__": [[757, 2, 2, 0, "bandwidth", "Bandwidth to use for the kernel."], [757, 2, 2, 0, "center", "Flag indicating whether to center the moment conditions by subtracting the mean before computing the weight matrix."], [757, 2, 2, 0, "debiased", "Flag indicating whether to use small-sample adjustments"], [757, 2, 2, 0, "kernel", "Name of kernel to use."], [757, 2, 2, 0, "optimal_bw", "Flag indicating whether to estimate the optimal bandwidth, when bandwidth is None."]], "linearmodels.system.gmm.KernelWeightMatrix.sigma": [[761, 2, 2, 0, "eps", "The residuals from the system of equations."], [761, 2, 2, 0, "x", "A list of the regressor matrices for each equation in the system."]], "linearmodels.system.gmm.KernelWeightMatrix.weight_matrix": [[762, 2, 2, 0, "eps", "Model errors (nobs by nequation)"], [762, 2, 2, 0, "sigma", "Fixed covariance of model errors."], [762, 2, 2, 0, "x", "Model regressors (exog and endog)"], [762, 2, 2, 0, "z", "Model instruments (exog and instruments)"]], "linearmodels.system.model": [[763, 1, 1, 0, "IV3SLS", "Three-stage Least Squares (3SLS) Estimator"], [774, 1, 1, 0, "IVSystemGMM", "System Generalized Method of Moments (GMM) estimation of linear IV models"], [784, 1, 1, 0, "LinearConstraint", "Linear constraint for regression estimation"], [789, 1, 1, 0, "SUR", "Seemingly unrelated regression estimation (SUR/SURE)"]], "linearmodels.system.model.IV3SLS": [[764, 4, 1, 0, "add_constraints", "Add parameter constraints to a model."], [765, 3, 1, 0, "constraints", "Model constraints"], [766, 4, 1, 0, "fit", "Estimate model parameters"], [767, 3, 1, 0, "formula", "Set or get the formula used to construct the model"], [768, 4, 1, 0, "from_formula", "Specify a 3SLS using the formula interface"], [769, 3, 1, 0, "has_constant", "Vector indicating which equations contain constants"], [770, 4, 1, 0, "multivariate_iv", "Interface for specification of multivariate IV models"], [771, 3, 1, 0, "param_names", "Model parameter names"], [772, 4, 1, 0, "predict", "Predict values for additional data"], [773, 4, 1, 0, "reset_constraints", "Remove all model constraints"]], "linearmodels.system.model.IV3SLS.__init__": [[763, 2, 2, 0, "equations", "Dictionary-like structure containing dependent, exogenous, endogenous and instrumental variables."], [763, 2, 2, 0, "sigma", "Prespecified residual covariance to use in GLS estimation."]], "linearmodels.system.model.IV3SLS.add_constraints": [[764, 2, 2, 0, "q", "Constraint values (nconstraints)."], [764, 2, 2, 0, "r", "Constraint matrix."]], "linearmodels.system.model.IV3SLS.fit": [[766, 2, 2, 0, "cov_config", "Additional parameters to pass to covariance estimator."], [766, 2, 2, 0, "cov_type", "Name of covariance estimator."], [766, 2, 2, 0, "full_cov", "Flag indicating whether to utilize information in correlations when estimating the model with GLS"], [766, 2, 2, 0, "iter_limit", "Maximum number of iterations for iterative GLS"], [766, 2, 2, 0, "iterate", "Flag indicating to iterate GLS until convergence of iter limit iterations have been completed"], [766, 2, 2, 0, "method", "Estimation method."], [766, 2, 2, 0, "tol", "Tolerance to use when checking for convergence in iterative GLS"]], "linearmodels.system.model.IV3SLS.from_formula": [[768, 2, 2, 0, "data", "Frame containing named variables"], [768, 2, 2, 0, "formula", "Either a string or a dictionary of strings where each value in the dictionary represents a single equation."], [768, 2, 2, 0, "sigma", "Prespecified residual covariance to use in GLS estimation."], [768, 2, 2, 0, "weights", "Dictionary like object (e.g."]], "linearmodels.system.model.IV3SLS.multivariate_iv": [[770, 2, 2, 0, "dependent", "nobs by ndep array of dependent variables"], [770, 2, 2, 0, "endog", "nobs by nendog array of endogenous regressors common to all models"], [770, 2, 2, 0, "exog", "nobs by nexog array of exogenous regressors common to all models"], [770, 2, 2, 0, "instruments", "nobs by ninstr array of instruments to use in all equations"]], "linearmodels.system.model.IV3SLS.predict": [[772, 2, 2, 0, "data", "Values to use when making predictions from a model constructed from a formula"], [772, 2, 2, 0, "equations", "Dictionary-like structure containing exogenous and endogenous variables."], [772, 2, 2, 0, "eval_env", "Depth to  use when evaluating formulas."], [772, 2, 2, 0, "params", "Model parameters (nvar by 1)"]], "linearmodels.system.model.IVSystemGMM": [[775, 4, 1, 0, "add_constraints", "Add parameter constraints to a model."], [776, 3, 1, 0, "constraints", "Model constraints"], [777, 4, 1, 0, "fit", "Estimate model parameters"], [778, 3, 1, 0, "formula", "Set or get the formula used to construct the model"], [779, 4, 1, 0, "from_formula", "Specify a 3SLS using the formula interface"], [780, 3, 1, 0, "has_constant", "Vector indicating which equations contain constants"], [781, 3, 1, 0, "param_names", "Model parameter names"], [782, 4, 1, 0, "predict", "Predict values for additional data"], [783, 4, 1, 0, "reset_constraints", "Remove all model constraints"]], "linearmodels.system.model.IVSystemGMM.__init__": [[774, 2, 2, 0, "equations", "Dictionary-like structure containing dependent, exogenous, endogenous and instrumental variables."], [774, 2, 2, 0, "sigma", "Prespecified residual covariance to use in GLS estimation."], [774, 2, 2, "linearmodels.system.model.IVSystemGMM", "weight_config", "System Generalized Method of Moments (GMM) estimation of linear IV models"], [774, 2, 2, 0, "weight_type", "Name of moment condition weight function to use in the GMM estimation"]], "linearmodels.system.model.IVSystemGMM.add_constraints": [[775, 2, 2, 0, "q", "Constraint values (nconstraints)."], [775, 2, 2, 0, "r", "Constraint matrix."]], "linearmodels.system.model.IVSystemGMM.fit": [[777, 2, 2, 0, "cov_config", "Additional parameters to pass to covariance estimator."], [777, 2, 2, 0, "cov_type", "Name of covariance estimator."], [777, 2, 2, 0, "initial_weight", "Initial weighting matrix to use in the first step."], [777, 2, 2, 0, "iter_limit", "Maximum number of iterations for iterative GLS"], [777, 2, 2, 0, "tol", "Tolerance to use when checking for convergence in iterative GLS"]], "linearmodels.system.model.IVSystemGMM.from_formula": [[779, 2, 2, 0, "data", "Frame containing named variables"], [779, 2, 2, 0, "formula", "Either a string or a dictionary of strings where each value in the dictionary represents a single equation."], [779, 2, 2, "linearmodels.system.model.IVSystemGMM.from_formula", "weight_config", "Specify a 3SLS using the formula interface"], [779, 2, 2, 0, "weight_type", "Name of moment condition weight function to use in the GMM estimation."], [779, 2, 2, 0, "weights", "Dictionary like object (e.g."]], "linearmodels.system.model.IVSystemGMM.predict": [[782, 2, 2, 0, "data", "Values to use when making predictions from a model constructed from a formula"], [782, 2, 2, 0, "equations", "Dictionary-like structure containing exogenous and endogenous variables."], [782, 2, 2, 0, "eval_env", "Depth to  use when evaluating formulas."], [782, 2, 2, 0, "params", "Model parameters (nvar by 1)"]], "linearmodels.system.model.LinearConstraint": [[785, 3, 1, 0, "a", "Transformed constraint target"], [786, 3, 1, 0, "q", "Constrain target values"], [787, 3, 1, 0, "r", "Constraint loading matrix"], [788, 3, 1, 0, "t", "Constraint transformation matrix"]], "linearmodels.system.model.LinearConstraint.__init__": [[784, 2, 2, 0, "num_params", "Number of model parameter."], [784, 2, 2, 0, "q", "Restriction value"], [784, 2, 2, 0, "r", "Restriction loading matrix"], [784, 2, 2, 0, "require_pandas", "Flag indicating whether r and q must be pandas"]], "linearmodels.system.model.SUR": [[790, 4, 1, 0, "add_constraints", "Add parameter constraints to a model."], [791, 3, 1, 0, "constraints", "Model constraints"], [792, 4, 1, 0, "fit", "Estimate model parameters"], [793, 3, 1, 0, "formula", "Set or get the formula used to construct the model"], [794, 4, 1, 0, "from_formula", "Specify a SUR using the formula interface"], [795, 3, 1, 0, "has_constant", "Vector indicating which equations contain constants"], [796, 4, 1, 0, "multivariate_ls", "Interface for specification of multivariate regression models"], [797, 3, 1, 0, "param_names", "Model parameter names"], [798, 4, 1, 0, "predict", "Predict values for additional data"], [799, 4, 1, 0, "reset_constraints", "Remove all model constraints"]], "linearmodels.system.model.SUR.__init__": [[789, 2, 2, 0, "equations", "Dictionary-like structure containing dependent and exogenous variable values."], [789, 2, 2, 0, "sigma", "Prespecified residual covariance to use in GLS estimation."]], "linearmodels.system.model.SUR.add_constraints": [[790, 2, 2, 0, "q", "Constraint values (nconstraints)."], [790, 2, 2, 0, "r", "Constraint matrix."]], "linearmodels.system.model.SUR.fit": [[792, 2, 2, 0, "cov_config", "Additional parameters to pass to covariance estimator."], [792, 2, 2, 0, "cov_type", "Name of covariance estimator."], [792, 2, 2, 0, "full_cov", "Flag indicating whether to utilize information in correlations when estimating the model with GLS"], [792, 2, 2, 0, "iter_limit", "Maximum number of iterations for iterative GLS"], [792, 2, 2, 0, "iterate", "Flag indicating to iterate GLS until convergence of iter limit iterations have been completed"], [792, 2, 2, 0, "method", "Estimation method."], [792, 2, 2, 0, "tol", "Tolerance to use when checking for convergence in iterative GLS"]], "linearmodels.system.model.SUR.from_formula": [[794, 2, 2, 0, "data", "Frame containing named variables"], [794, 2, 2, 0, "formula", "Either a string or a dictionary of strings where each value in the dictionary represents a single equation."], [794, 2, 2, 0, "sigma", "Prespecified residual covariance to use in GLS estimation."], [794, 2, 2, 0, "weights", "Dictionary like object (e.g."]], "linearmodels.system.model.SUR.multivariate_ls": [[796, 2, 2, 0, "dependent", "nobs by ndep array of dependent variables"], [796, 2, 2, 0, "exog", "nobs by nvar array of exogenous regressors common to all models"]], "linearmodels.system.model.SUR.predict": [[798, 2, 2, 0, "data", "Values to use when making predictions from a model constructed from a formula"], [798, 2, 2, 0, "equations", "Dictionary-like structure containing exogenous and endogenous variables."], [798, 2, 2, 0, "eval_env", "Depth to  use when evaluating formulas."], [798, 2, 2, 0, "params", "Model parameters (nvar by 1)"]], "linearmodels.system.results": [[800, 1, 1, 0, "GMMSystemResults", "Results from GMM System Estimators"], [835, 1, 1, 0, "SystemResults", "Results from Seemingly Unrelated Regression Estimators"]], "linearmodels.system.results.GMMSystemResults": [[801, 4, 1, 0, "breusch_pagan", "Breusch-Pagan LM test for no cross-correlation"], [802, 4, 1, 0, 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796, 798, 820, 854], "candid": 149, "cannot": [73, 150, 358, 359, 397, 398, 401, 718], "canon": 403, "cap": [69, 71, 402, 796], "capabl": 91, "capit": [398, 403, 714], "capm": 714, "captur": 91, "card": 150, "care": [69, 70], "cart": [139, 143], "cartesian": [91, 139, 147], "case": [69, 72, 149, 150, 151, 153, 211, 215, 226, 237, 249, 260, 394, 398, 399, 402, 454, 490, 498, 506, 515, 525, 533, 712, 714, 715, 717, 718, 789, 814, 848, 890], "cast": 454, "cat": [91, 134, 139, 143, 148], "categor": [77, 91, 134, 139, 140, 143, 148, 182, 397, 398, 454, 488, 504, 511, 513, 523, 531, 574, 614, 663, 700], "categori": [77, 139, 147, 150, 182, 394, 396, 454, 511, 515, 710, 763], "cats_df": 139, "caution": [77, 150, 714, 718], "caveat": 398, "ccc": 73, "cccc": [718, 763, 774, 789], "cdf": 394, "cdot": 394, "censor": [714, 715], "cent": 150, "center": [0, 7, 21, 192, 195, 204, 208, 233, 394, 399, 716, 718, 749, 753, 757], "central": 714, "certain": [397, 763, 789], "cgrant": [150, 396], 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715, 716, 717], "ci_": 394, "cig": 150, "cigarett": 150, "cigpric": 150, "cigtax": 150, "circumst": [233, 397, 717], "citi": 150, "clarifi": 77, "class": [0, 7, 16, 17, 20, 21, 24, 25, 28, 49, 76, 77, 81, 89, 91, 102, 134, 139, 149, 152, 153, 154, 160, 166, 172, 182, 192, 195, 198, 204, 208, 211, 212, 222, 233, 245, 246, 249, 256, 257, 260, 267, 271, 288, 309, 321, 339, 362, 375, 400, 404, 412, 420, 428, 438, 446, 454, 479, 487, 495, 503, 511, 522, 530, 538, 576, 616, 630, 665, 703, 710, 712, 717, 720, 724, 727, 730, 735, 739, 743, 749, 753, 757, 763, 774, 784, 789, 800, 835, 871, 876, 881], "classic": [96, 149, 150, 213, 247, 258, 397, 401, 551, 587, 640, 675, 766, 777, 792], "classmethod": [19, 23, 27, 480, 490, 498, 506, 515, 525, 533, 768, 770, 779, 794, 796], "clavgsal": [150, 396], "clean": 77, "cleaner": 150, "clear": 89, "clemploi": [150, 396], "clhrsemp": [150, 396], "close": [69, 148, 149, 150, 287, 322, 324, 394, 813], "clsale": [150, 396], "clscrap": [150, 396], 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\ No newline at end of file
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Uses t(df_resid) if debiased is True, else normal"], [123, 3, 1, 0, "resid_ss", "Residual sum of squares"], [124, 3, 1, 0, "resids", "Estimated residuals"], [125, 3, 1, 0, "rsquared", "Coefficient of determination (R**2)"], [126, 3, 1, 0, "rsquared_adj", "Sample-size adjusted coefficient of determination (R**2)"], [127, 3, 1, 0, "s2", "Residual variance estimator"], [128, 3, 1, 0, "std_errors", "Estimated parameter standard errors"], [129, 3, 1, 0, "summary", "Model estimation summary."], [130, 3, 1, 0, "total_ss", "Total sum of squares"], [131, 3, 1, 0, "tstats", "Parameter t-statistics"], [132, 4, 1, 0, "wald_test", "Test linear equality constraints using a Wald test"], [133, 3, 1, 0, "wresids", "Weighted estimated residuals"]], "linearmodels.iv.absorbing.AbsorbingLSResults.__init__": [[102, 2, 2, 0, "model", "The model used to estimate parameters."], [102, 2, 2, 0, "results", "A dictionary of results from the model estimation."]], "linearmodels.iv.absorbing.AbsorbingLSResults.conf_int": [[105, 2, 2, 0, "level", "Confidence level for interval"]], "linearmodels.iv.absorbing.AbsorbingLSResults.wald_test": [[132, 2, 2, 0, "formula", "formulaic linear constraints."], [132, 2, 2, 0, "restriction", "q by nvar array containing linear weights to apply to parameters when forming the restrictions."], [132, 2, 2, 0, "value", "q element array containing the restricted values."]], "linearmodels.iv.absorbing.AbsorbingRegressor": [[135, 3, 1, 0, "approx_rank", ""], [136, 3, 1, 0, "has_constant", "Flag indicating whether the regressors have a constant equivalent"], [137, 3, 1, 0, "hash", ""], [138, 3, 1, 0, "regressors", ""]], "linearmodels.iv.absorbing.AbsorbingRegressor.__init__": [[134, 2, 2, 0, "cat", "List of categorical variables (factors) to absorb"], [134, 2, 2, 0, "cont", "List of continuous variables to absorb"], [134, 2, 2, 0, "interactions", "List of included interactions"], [134, 2, 2, 0, "weights", "Weights, if any"]], "linearmodels.iv.absorbing.Interaction": [[140, 3, 1, 0, "cat", "Categorical Variables"], [141, 3, 1, 0, "cont", "Continuous Variables"], [142, 4, 1, 0, "drop", ""], [143, 4, 1, 0, "from_frame", "Convenience function the simplifies using a DataFrame"], [144, 3, 1, 0, "hash", "Construct a hash that will be invariant for any permutation of inputs that produce the same fit when used as regressors"], [145, 3, 1, 0, "isnull", ""], [146, 3, 1, 0, "nobs", ""], [147, 3, 1, 0, "sparse", "Construct a sparse interaction matrix"]], "linearmodels.iv.absorbing.Interaction.__init__": [[139, 2, 2, 0, "cat", "Variables to treat as categoricals."], [139, 2, 2, 0, "cont", "Variables to treat as continuous, (nobs, ncont)."], [139, 2, 2, "linearmodels.iv.absorbing.Interaction", "nobs", "Class that simplifies specifying interactions"]], "linearmodels.iv.absorbing.Interaction.drop": [[142, 2, 2, "linearmodels.iv.absorbing.Interaction.drop", "locs", ""]], "linearmodels.iv.absorbing.Interaction.from_frame": [[143, 2, 2, 0, "frame", "Frame containing categorical and continuous variables."]], "linearmodels.iv.covariance": [[154, 1, 1, 0, "ClusteredCovariance", "Covariance estimation for clustered data"], [160, 1, 1, 0, "HeteroskedasticCovariance", "Covariance estimation for heteroskedastic data"], [166, 1, 1, 0, "HomoskedasticCovariance", "Covariance estimation for homoskedastic data"], [172, 1, 1, 0, "KernelCovariance", "Kernel weighted (HAC) covariance estimation"], [178, 5, 1, 0, "kernel_optimal_bandwidth", "Array of data to use when computing optimal bandwidth"], [179, 5, 1, 0, "kernel_weight_bartlett", "Kernel weights from a Bartlett kernel"], [180, 5, 1, 0, "kernel_weight_parzen", "Kernel weights from a Parzen kernel"], [181, 5, 1, 0, "kernel_weight_quadratic_spectral", "Kernel weights from a quadratic-spectral kernel"]], "linearmodels.iv.covariance.ClusteredCovariance": [[155, 3, 1, 0, "config", ""], [156, 3, 1, 0, "cov", "Covariance of estimated parameters"], [157, 3, 1, 0, "debiased", "Flag indicating if covariance is debiased"], [158, 3, 1, 0, "s", "Clustered estimator of score covariance"], [159, 3, 1, 0, "s2", "Estimated variance of residuals. Small-sample adjusted if debiased."]], "linearmodels.iv.covariance.ClusteredCovariance.__init__": [[154, 2, 2, 0, "clusters", "Cluster group assignment."], [154, 2, 2, 0, "debiased", "Flag indicating whether to use a small-sample adjustment"], [154, 2, 2, 0, "kappa", "Value of kappa in k-class estimator"], [154, 2, 2, 0, "params", "Estimated model parameters (nvar by 1)"], [154, 2, 2, 0, "x", "Model regressors (nobs by nvar)"], [154, 2, 2, 0, "y", "Series ,modeled (nobs by 1)"], [154, 2, 2, 0, "z", "Instruments used for endogenous regressors (nobs by ninstr)"]], "linearmodels.iv.covariance.HeteroskedasticCovariance": [[161, 3, 1, 0, "config", ""], [162, 3, 1, 0, "cov", "Covariance of estimated parameters"], [163, 3, 1, 0, "debiased", "Flag indicating if covariance is debiased"], [164, 3, 1, 0, "s", "Heteroskedasticity-robust score covariance estimate"], [165, 3, 1, 0, "s2", "Estimated variance of residuals. Small-sample adjusted if debiased."]], "linearmodels.iv.covariance.HeteroskedasticCovariance.__init__": [[160, 2, 2, 0, "debiased", "Flag indicating whether to use a small-sample adjustment"], [160, 2, 2, 0, "kappa", "Value of kappa in k-class estimator"], [160, 2, 2, 0, "params", "Estimated model parameters (nvar by 1)"], [160, 2, 2, 0, "x", "Model regressors (nobs by nvar)"], [160, 2, 2, 0, "y", "Series ,modeled (nobs by 1)"], [160, 2, 2, 0, "z", "Instruments used for endogenous regressors (nobs by ninstr)"]], "linearmodels.iv.covariance.HomoskedasticCovariance": [[167, 3, 1, 0, "config", ""], [168, 3, 1, 0, "cov", "Covariance of estimated parameters"], [169, 3, 1, 0, "debiased", "Flag indicating if covariance is debiased"], [170, 3, 1, 0, "s", "Score covariance estimate"], [171, 3, 1, 0, "s2", "Estimated variance of residuals. Small-sample adjusted if debiased."]], "linearmodels.iv.covariance.HomoskedasticCovariance.__init__": [[166, 2, 2, 0, "debiased", "Flag indicating whether to use a small-sample adjustment"], [166, 2, 2, 0, "kappa", "Value of kappa in k-class estimator"], [166, 2, 2, 0, "params", "Estimated model parameters (nvar by 1)"], [166, 2, 2, 0, "x", "Model regressors (nobs by nvar)"], [166, 2, 2, 0, "y", "Series modeled (nobs by 1)"], [166, 2, 2, 0, "z", "Instruments used for endogenous regressors (nobs by ninstr)"]], "linearmodels.iv.covariance.KernelCovariance": [[173, 3, 1, 0, "config", ""], [174, 3, 1, 0, "cov", "Covariance of estimated parameters"], [175, 3, 1, 0, "debiased", "Flag indicating if covariance is debiased"], [176, 3, 1, 0, "s", "HAC score covariance estimate"], [177, 3, 1, 0, "s2", "Estimated variance of residuals. Small-sample adjusted if debiased."]], "linearmodels.iv.covariance.KernelCovariance.__init__": [[172, 2, 2, 0, "bandwidth", "Non-negative bandwidth to use with kernel."], [172, 2, 2, 0, "debiased", "Flag indicating whether to use a small-sample adjustment"], [172, 2, 2, 0, "kappa", "Value of kappa in k-class estimator"], [172, 2, 2, 0, "kernel", "Kernel name."], [172, 2, 2, 0, "params", "Estimated model parameters (nvar by 1)"], [172, 2, 2, 0, "x", "Model regressors (nobs by nvar)"], [172, 2, 2, 0, "y", "Series ,modeled (nobs by 1)"], [172, 2, 2, 0, "z", "Instruments used for endogenous regressors (nobs by ninstr)"]], "linearmodels.iv.covariance.kernel_optimal_bandwidth": [[178, 2, 2, 0, "kernel", "Name of kernel to use."], [178, 2, 2, 0, "x", "Array of data to use when computing optimal bandwidth"]], "linearmodels.iv.covariance.kernel_weight_bartlett": [[179, 2, 2, "linearmodels.iv.covariance.kernel_weight_bartlett", "args", "Kernel weights from a Bartlett kernel"], [179, 2, 2, 0, "bw", "Maximum lag to used in kernel"]], "linearmodels.iv.covariance.kernel_weight_parzen": [[180, 2, 2, "linearmodels.iv.covariance.kernel_weight_parzen", "args", "Kernel weights from a Parzen kernel"], [180, 2, 2, 0, "bw", "Maximum lag to used in kernel"]], "linearmodels.iv.covariance.kernel_weight_quadratic_spectral": [[181, 2, 2, 0, "bw", "Maximum lag to used in kernel"], [181, 2, 2, 0, "n", "Positive number of weight to return"]], "linearmodels.iv.data": [[182, 1, 1, 0, "IVData", "Type abstraction for use in univariate models."]], "linearmodels.iv.data.IVData": [[183, 3, 1, 0, "cols", "Column labels"], [184, 4, 1, 0, "drop", ""], [185, 3, 1, 0, "isnull", ""], [186, 3, 1, 0, "labels", "Dictionary containing row and column labels keyed by axis"], [187, 3, 1, 0, "ndarray", "ndarray view of data, always 2d"], [188, 3, 1, 0, "ndim", "Number of dimensions"], [189, 3, 1, 0, "pandas", "DataFrame view of data"], [190, 3, 1, 0, "rows", "Row labels (index)"], [191, 3, 1, 0, "shape", "Tuple containing shape"]], "linearmodels.iv.data.IVData.__init__": [[182, 2, 2, 0, "convert_dummies", "Flat indicating whether pandas categoricals or string input data should be converted to dummy variables"], [182, 2, 2, 0, "drop_first", "Flag indicating to drop first dummy category"], [182, 2, 2, 0, "nobs", "Number of observation, used when x is None."], [182, 2, 2, 0, "var_name", "Variable name to use when naming variables in NumPy arrays or xarray DataArrays"], [182, 2, 2, 0, "x", "Data to wrap and standardize."]], "linearmodels.iv.data.IVData.drop": [[184, 2, 2, "linearmodels.iv.data.IVData.drop", "locs", ""]], "linearmodels.iv.gmm": [[192, 1, 1, 0, "HeteroskedasticWeightMatrix", "Heteroskedasticity robust weight estimation"], [195, 1, 1, 0, "HomoskedasticWeightMatrix", "Homoskedastic (unadjusted) weight estimation"], [198, 1, 1, 0, "IVGMMCovariance", "Covariance estimation for GMM models"], [204, 1, 1, 0, "KernelWeightMatrix", "Heteroskedasticity, autocorrelation robust weight estimation"], [208, 1, 1, 0, "OneWayClusteredWeightMatrix", "Clustered (one-way) weight estimation"]], "linearmodels.iv.gmm.HeteroskedasticWeightMatrix": [[193, 3, 1, 0, "config", "Weight estimator configuration"], [194, 4, 1, 0, "weight_matrix", "Model regressors (exog and endog), (nobs by nvar)"]], "linearmodels.iv.gmm.HeteroskedasticWeightMatrix.__init__": [[192, 2, 2, 0, "center", "Flag indicating whether to center the moment conditions by subtracting the mean before computing the weight matrix."], [192, 2, 2, 0, "debiased", "Flag indicating whether to use small-sample adjustments"]], "linearmodels.iv.gmm.HeteroskedasticWeightMatrix.weight_matrix": [[194, 2, 2, 0, "eps", "Model errors (nobs by 1)"], [194, 2, 2, 0, "x", "Model regressors (exog and endog), (nobs by nvar)"], [194, 2, 2, 0, "z", "Model instruments (exog and instruments), (nobs by ninstr)"]], "linearmodels.iv.gmm.HomoskedasticWeightMatrix": [[196, 3, 1, 0, "config", "Weight estimator configuration"], [197, 4, 1, 0, "weight_matrix", "Model regressors (exog and endog), (nobs by nvar)"]], "linearmodels.iv.gmm.HomoskedasticWeightMatrix.__init__": [[195, 2, 2, 0, "center", "Flag indicating whether to center the moment conditions by subtracting the mean before computing the weight matrix."], [195, 2, 2, 0, "debiased", "Flag indicating whether to use small-sample adjustments"]], "linearmodels.iv.gmm.HomoskedasticWeightMatrix.weight_matrix": [[197, 2, 2, 0, "eps", "Model errors (nobs by 1)"], [197, 2, 2, 0, "x", "Model regressors (exog and endog), (nobs by nvar)"], [197, 2, 2, 0, "z", "Model instruments (exog and instruments), (nobs by ninstr)"]], "linearmodels.iv.gmm.IVGMMCovariance": [[199, 3, 1, 0, "config", ""], [200, 3, 1, 0, "cov", "Covariance of estimated parameters"], [201, 3, 1, 0, "debiased", "Flag indicating if covariance is debiased"], [202, 3, 1, 0, "s", "Score covariance estimate"], [203, 3, 1, 0, "s2", "Estimated variance of residuals. Small-sample adjusted if debiased."]], "linearmodels.iv.gmm.IVGMMCovariance.__init__": [[198, 2, 2, 0, "cov_config", "Optional keyword arguments that are specific to a particular cov_type"], [198, 2, 2, 0, "cov_type", "Covariance estimator to use  Valid choices are"], [198, 2, 2, 0, "debiased", "Flag indicating whether to debias the covariance estimator"], [198, 2, 2, 0, "params", "Estimated model parameters (nvar by 1)"], [198, 2, 2, 0, "w", "Weighting matrix used in GMM estimation"], [198, 2, 2, 0, "x", "Model regressors (nobs by nvar)"], [198, 2, 2, 0, "y", "Series ,modeled (nobs by 1)"], [198, 2, 2, 0, "z", "Instruments used for endogenous regressors (nobs by ninstr)"]], "linearmodels.iv.gmm.KernelWeightMatrix": [[205, 3, 1, 0, "bandwidth", "Actual bandwidth used in estimating the weight matrix"], [206, 3, 1, 0, "config", "Weight estimator configuration"], [207, 4, 1, 0, "weight_matrix", "Model regressors (exog and endog), (nobs by nvar)"]], "linearmodels.iv.gmm.KernelWeightMatrix.__init__": [[204, 2, 2, 0, "bandwidth", "Bandwidth to use when computing kernel weights"], [204, 2, 2, 0, "center", "Flag indicating whether to center the moment conditions by subtracting the mean before computing the weight matrix."], [204, 2, 2, 0, "debiased", "Flag indicating whether to use small-sample adjustments"], [204, 2, 2, 0, "kernel", "Name of kernel weighting function to use"], [204, 2, 2, 0, "optimal_bw", "Flag indicating whether to estimate the optimal bandwidth, when bandwidth is None."]], "linearmodels.iv.gmm.KernelWeightMatrix.weight_matrix": [[207, 2, 2, 0, "eps", "Model errors (nobs by 1)"], [207, 2, 2, 0, "x", "Model regressors (exog and endog), (nobs by nvar)"], [207, 2, 2, 0, "z", "Model instruments (exog and instruments), (nobs by ninstr)"]], "linearmodels.iv.gmm.OneWayClusteredWeightMatrix": [[209, 3, 1, 0, "config", "Weight estimator configuration"], [210, 4, 1, 0, "weight_matrix", "Model regressors (exog and endog), (nobs by nvar)"]], "linearmodels.iv.gmm.OneWayClusteredWeightMatrix.__init__": [[208, 2, 2, 0, "center", "Flag indicating whether to center the moment conditions by subtracting the mean before computing the weight matrix."], [208, 2, 2, 0, "clusters", "Array indicating cluster membership"], [208, 2, 2, 0, "debiased", "Flag indicating whether to use small-sample adjustments"]], "linearmodels.iv.gmm.OneWayClusteredWeightMatrix.weight_matrix": [[210, 2, 2, 0, "eps", "Model errors (nobs by 1)"], [210, 2, 2, 0, "x", "Model regressors (exog and endog), (nobs by nvar)"], [210, 2, 2, 0, "z", "Model instruments (exog and instruments), (nobs by ninstr)"]], "linearmodels.iv.model": [[211, 1, 1, 0, "IV2SLS", "Estimation of IV models using two-stage least squares"], [222, 1, 1, 0, "IVGMM", "Estimation of IV models using the generalized method of moments (GMM)"], [233, 1, 1, 0, "IVGMMCUE", "Estimation of IV models using continuously updating GMM"], [245, 1, 1, 0, "IVLIML", "Limited information ML and k-class estimation of IV models"], [256, 1, 1, 0, "_OLS", "Computes OLS estimates when required"]], "linearmodels.iv.model.IV2SLS": [[212, 4, 1, 0, "estimate_parameters", "Parameter estimation without error checking"], [213, 4, 1, 0, "fit", "Estimate model parameters"], [214, 3, 1, 0, "formula", "Formula used to create the model"], [215, 4, 1, 0, "from_formula", "Formula modified for the IV syntax described in the notes section"], [216, 3, 1, 0, "has_constant", "Flag indicating the model includes a constant or equivalent"], [217, 3, 1, 0, "isnull", "Locations of observations with missing values"], [218, 3, 1, 0, "notnull", "Locations of observations included in estimation"], [219, 4, 1, 0, "predict", "Predict values for additional data"], [220, 4, 1, 0, "resids", "Compute model residuals"], [221, 4, 1, 0, "wresids", "Compute weighted model residuals"]], "linearmodels.iv.model.IV2SLS.__init__": [[211, 2, 2, 0, "dependent", "Endogenous variables (nobs by 1)"], [211, 2, 2, 0, "endog", 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Default is \"tstats\"."], [309, 2, 2, 0, "results", "Set of results to compare."], [309, 2, 2, 0, "stars", "Add stars based on the p-value of the coefficient where 1, 2 and 3-stars correspond to p-values of 10%, 5% and 1%, respectively."]], "linearmodels.iv.results.IVResults": [[322, 3, 1, 0, "anderson_rubin", "Anderson-Rubin test of overidentifying restrictions"], [323, 3, 1, 0, "basmann", "Basmann's test of overidentifying restrictions"], [324, 3, 1, 0, "basmann_f", "Basmann's F test of overidentifying restrictions"], [325, 4, 1, 0, "conf_int", "Confidence interval construction"], [326, 3, 1, 0, "cov", "Estimated covariance of parameters"], [327, 3, 1, 0, "cov_config", "Parameter values from covariance estimator"], [328, 3, 1, 0, "cov_estimator", "Type of covariance estimator used to compute covariance"], [329, 3, 1, 0, "cov_type", "Covariance estimator used"], [330, 3, 1, 0, "debiased", "Flag indicating whether covariance uses a small-sample adjustment"], [331, 3, 1, 0, "df_model", "Model degree of freedom"], [332, 3, 1, 0, "df_resid", "Residual degree of freedom"], [333, 4, 1, 0, "durbin", "Durbin's test of exogeneity"], [334, 3, 1, 0, "f_statistic", "Model F-statistic"], [335, 3, 1, 0, "first_stage", "First stage regression results"], [336, 3, 1, 0, "fitted_values", "Fitted values"], [337, 3, 1, 0, "has_constant", "Flag indicating the model includes a constant or equivalent"], [338, 3, 1, 0, "idiosyncratic", "Idiosyncratic error"], [339, 3, 1, 0, "kappa", "k-class estimator value"], [340, 3, 1, 0, "method", "Method used to estimate model parameters"], [341, 3, 1, 0, "model_ss", "Residual sum of squares"], [342, 3, 1, 0, "nobs", "Number of observations"], [343, 3, 1, 0, "params", "Estimated parameters"], [344, 4, 1, 0, "predict", "In- and out-of-sample predictions"], [345, 3, 1, 0, "pvalues", "Parameter p-vals. Uses t(df_resid) if debiased is True, else normal"], [346, 3, 1, 0, "resid_ss", "Residual sum of squares"], [347, 3, 1, 0, "resids", "Estimated residuals"], [348, 3, 1, 0, "rsquared", "Coefficient of determination (R**2)"], [349, 3, 1, 0, "rsquared_adj", "Sample-size adjusted coefficient of determination (R**2)"], [350, 3, 1, 0, "s2", "Residual variance estimator"], [351, 3, 1, 0, "sargan", "Sargan test of overidentifying restrictions"], [352, 3, 1, 0, "std_errors", "Estimated parameter standard errors"], [353, 3, 1, 0, "summary", "Model estimation summary."], [354, 3, 1, 0, "total_ss", "Total sum of squares"], [355, 3, 1, 0, "tstats", "Parameter t-statistics"], [356, 4, 1, 0, "wald_test", "Test linear equality constraints using a Wald test"], [357, 3, 1, 0, "wooldridge_overid", "Wooldridge's score test of overidentification"], [358, 3, 1, 0, "wooldridge_regression", "Wooldridge's regression test of exogeneity"], [359, 3, 1, 0, "wooldridge_score", "Wooldridge's score test of exogeneity"], [360, 3, 1, 0, "wresids", "Weighted estimated residuals"], [361, 4, 1, 0, "wu_hausman", "Wu-Hausman test of exogeneity"]], "linearmodels.iv.results.IVResults.__init__": [[321, 2, 2, 0, "model", "The model used to estimate parameters."], [321, 2, 2, 0, "results", "A dictionary of results from the model estimation."]], "linearmodels.iv.results.IVResults.conf_int": [[325, 2, 2, 0, "level", "Confidence level for interval"]], "linearmodels.iv.results.IVResults.durbin": [[333, 2, 2, 0, "variables", "List of variables to test for exogeneity."]], "linearmodels.iv.results.IVResults.predict": [[344, 2, 2, 0, "data", "DataFrame to use for out-of-sample predictions when model was constructed using a formula."], [344, 2, 2, 0, "endog", "Endogenous values to use in out-of-sample prediction (nobs by nendog)"], [344, 2, 2, 0, "exog", "Exogenous values to use in out-of-sample prediction (nobs by nexog)"], [344, 2, 2, 0, "fitted", "Flag indicating whether to include the fitted values"], [344, 2, 2, 0, "idiosyncratic", "Flag indicating whether to include the estimated idiosyncratic shock"], [344, 2, 2, 0, "missing", "Flag indicating to adjust for dropped observations."]], "linearmodels.iv.results.IVResults.wald_test": [[356, 2, 2, 0, "formula", "formulaic linear constraints."], [356, 2, 2, 0, "restriction", "q by nvar array containing linear weights to apply to parameters when forming the restrictions."], [356, 2, 2, 0, "value", "q element array containing the restricted values."]], "linearmodels.iv.results.IVResults.wu_hausman": [[361, 2, 2, 0, "variables", "List of variables to test for exogeneity."]], "linearmodels.iv.results.OLSResults": [[363, 4, 1, 0, "conf_int", "Confidence interval construction"], [364, 3, 1, 0, "cov", "Estimated covariance of parameters"], [365, 3, 1, 0, "cov_config", "Parameter values from covariance estimator"], [366, 3, 1, 0, "cov_estimator", "Type of covariance estimator used to compute covariance"], [367, 3, 1, 0, "cov_type", "Covariance estimator used"], [368, 3, 1, 0, "debiased", "Flag indicating whether covariance uses a small-sample adjustment"], [369, 3, 1, 0, "df_model", "Model degree of freedom"], [370, 3, 1, 0, "df_resid", "Residual degree of freedom"], [371, 3, 1, 0, "f_statistic", "Model F-statistic"], [372, 3, 1, 0, "fitted_values", "Fitted values"], [373, 3, 1, 0, "has_constant", "Flag indicating the model includes a constant or equivalent"], [374, 3, 1, 0, "idiosyncratic", "Idiosyncratic error"], [375, 3, 1, 0, "kappa", "k-class estimator value"], [376, 3, 1, 0, "method", "Method used to estimate model parameters"], [377, 3, 1, 0, "model_ss", "Residual sum of squares"], [378, 3, 1, 0, "nobs", "Number of observations"], [379, 3, 1, 0, "params", "Estimated parameters"], [380, 4, 1, 0, "predict", "In- and out-of-sample predictions"], [381, 3, 1, 0, "pvalues", "Parameter p-vals. Uses t(df_resid) if debiased is True, else normal"], [382, 3, 1, 0, "resid_ss", "Residual sum of squares"], [383, 3, 1, 0, "resids", "Estimated residuals"], [384, 3, 1, 0, "rsquared", "Coefficient of determination (R**2)"], [385, 3, 1, 0, "rsquared_adj", "Sample-size adjusted coefficient of determination (R**2)"], [386, 3, 1, 0, "s2", "Residual variance estimator"], [387, 3, 1, 0, "std_errors", "Estimated parameter standard errors"], [388, 3, 1, 0, "summary", "Model estimation summary."], [389, 3, 1, 0, "total_ss", "Total sum of squares"], [390, 3, 1, 0, "tstats", "Parameter t-statistics"], [391, 4, 1, 0, "wald_test", "Test linear equality constraints using a Wald test"], [392, 3, 1, 0, "wresids", "Weighted estimated residuals"]], "linearmodels.iv.results.OLSResults.__init__": [[362, 2, 2, 0, "model", "The model used to estimate parameters."], [362, 2, 2, 0, "results", "A dictionary of results from the model estimation."]], "linearmodels.iv.results.OLSResults.conf_int": [[363, 2, 2, 0, "level", "Confidence level for interval"]], "linearmodels.iv.results.OLSResults.predict": [[380, 2, 2, 0, "data", "DataFrame to use for out-of-sample predictions when model was constructed using a formula."], [380, 2, 2, 0, "endog", "Endogenous values to use in out-of-sample prediction (nobs by nendog)"], [380, 2, 2, 0, "exog", "Exogenous values to use in out-of-sample prediction (nobs by nexog)"], [380, 2, 2, 0, "fitted", "Flag indicating whether to include the fitted values"], [380, 2, 2, 0, "idiosyncratic", "Flag indicating whether to include the estimated idiosyncratic shock"], [380, 2, 2, 0, "missing", "Flag indicating to adjust for dropped observations."]], "linearmodels.iv.results.OLSResults.wald_test": [[391, 2, 2, 0, "formula", "formulaic linear constraints."], [391, 2, 2, 0, "restriction", "q by nvar array containing linear weights to apply to parameters when forming the restrictions."], [391, 2, 2, 0, "value", "q element array containing the restricted values."]], "linearmodels.iv.results.compare": [[393, 2, 2, 0, "precision", "Estimator precision estimator to include in the comparison output. Default is \"tstats\"."], [393, 2, 2, 0, "results", "Set of results to compare."], [393, 2, 2, 0, "stars", "Add stars based on the p-value of the coefficient where 1, 2 and 3-stars correspond to p-values of 10%, 5% and 1%, respectively."]], "linearmodels.panel": [[711, 0, 0, 1, "covariance", ""], [711, 0, 0, 1, "data", ""], [711, 0, 0, 1, "model", ""], [711, 0, 0, 1, "results", ""], [711, 0, 0, 1, "utility", ""]], "linearmodels.panel.covariance": [[404, 1, 1, 0, "ACCovariance", "Autocorrelation robust covariance estimation"], [412, 1, 1, 0, "ClusteredCovariance", "One-way (Rogers) or two-way clustered covariance estimation"], [420, 1, 1, 0, "DriscollKraay", "Driscoll-Kraay heteroskedasticity-autocorrelation robust covariance estimation"], [428, 1, 1, 0, "FamaMacBethCovariance", "HAC estimator for Fama-MacBeth estimator"], [438, 1, 1, 0, "HeteroskedasticCovariance", "Covariance estimation using White estimator"], [446, 1, 1, 0, "HomoskedasticCovariance", "Homoskedastic covariance 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"time_ids", "(entity x time) by 1 stacked array of time ids"], [404, 2, 2, 0, "x", "(entity x time) by variables stacked array of exogenous"], [404, 2, 2, 0, "y", "(entity x time) by 1 stacked array of dependent"]], "linearmodels.panel.covariance.ClusteredCovariance": [[413, 6, 1, 0, "ALLOWED_KWARGS", ""], [414, 6, 1, 0, "DEFAULT_KERNEL", ""], [415, 3, 1, 0, "cov", "Estimated covariance"], [416, 4, 1, 0, "deferred_cov", "Covariance calculation deferred until executed"], [417, 3, 1, 0, "eps", "Model residuals"], [418, 3, 1, 0, "name", "Covariance estimator name"], [419, 3, 1, 0, "s2", "Error variance"]], "linearmodels.panel.covariance.ClusteredCovariance.__init__": [[412, 2, 2, 0, "clusters", "nobs by 1 or nobs by 2 array of cluster group ids"], [412, 2, 2, 0, "debiased", "Flag indicating whether to debias the estimator"], [412, 2, 2, 0, "entity_ids", "(entity x time) by 1 stacked array of entity ids"], [412, 2, 2, 0, "extra_df", "Additional degrees of freedom consumed by models beyond the number of columns in x, e.g., fixed effects."], [412, 2, 2, 0, "group_debias", "Flag indicating whether to apply small-number of groups adjustment."], [412, 2, 2, 0, "params", "variables by 1 array of estimated model parameters"], [412, 2, 2, 0, "time_ids", "(entity x time) by 1 stacked array of time ids"], [412, 2, 2, 0, "x", "nobs by variables stacked array of exogenous"], [412, 2, 2, 0, "y", "nobs by 1 stacked array of dependent"]], "linearmodels.panel.covariance.DriscollKraay": [[421, 6, 1, 0, "ALLOWED_KWARGS", ""], [422, 6, 1, 0, "DEFAULT_KERNEL", ""], [423, 3, 1, 0, "cov", "Estimated covariance"], [424, 4, 1, 0, "deferred_cov", "Covariance calculation deferred until executed"], [425, 3, 1, 0, "eps", "Model residuals"], [426, 3, 1, 0, "name", "Covariance estimator name"], [427, 3, 1, 0, "s2", "Error variance"]], "linearmodels.panel.covariance.DriscollKraay.__init__": [[420, 2, 2, 0, "bandwidth", "Non-negative integer to use as bandwidth."], [420, 2, 2, 0, "debiased", "Flag indicating whether to debias the estimator"], [420, 2, 2, 0, "entity_ids", "(entity x time) by 1 stacked array of entity ids"], [420, 2, 2, 0, "extra_df", "Additional degrees of freedom consumed by models beyond the number of columns in x, e.g., fixed effects."], [420, 2, 2, 0, "kernel", "Name of one of the supported kernels."], [420, 2, 2, 0, "params", "variables by 1 array of estimated model parameters"], [420, 2, 2, 0, "time_ids", "(entity x time) by 1 stacked array of time ids"], [420, 2, 2, 0, "x", "(entity x time) by variables stacked array of exogenous"], [420, 2, 2, 0, "y", "(entity x time) by 1 stacked array of dependent"]], "linearmodels.panel.covariance.FamaMacBethCovariance": [[429, 6, 1, 0, "ALLOWED_KWARGS", ""], [430, 6, 1, 0, "DEFAULT_KERNEL", ""], [431, 3, 1, 0, "all_params", "The set of parameters estimated for each of the time periods"], [432, 3, 1, 0, "bandwidth", "Estimator bandwidth"], [433, 3, 1, 0, "cov", "Estimated covariance"], [434, 4, 1, 0, "deferred_cov", "Covariance calculation deferred until executed"], [435, 3, 1, 0, "eps", "Model residuals"], [436, 3, 1, 0, "name", "Covariance estimator name"], [437, 3, 1, 0, "s2", "Error variance"]], "linearmodels.panel.covariance.FamaMacBethCovariance.__init__": [[428, 2, 2, 0, "all_params", "(nobs by variables) array of all estimated model parameters"], [428, 2, 2, 0, "bandwidth", "Non-negative integer to use as bandwidth."], [428, 2, 2, 0, "debiased", "Flag indicating whether to debias the estimator."], [428, 2, 2, 0, "kernel", "Name of one of the supported kernels."], [428, 2, 2, 0, "params", "(variables by 1) array of estimated model parameters"], [428, 2, 2, 0, "x", "(entity x time) by variables stacked array of exogenous"], [428, 2, 2, 0, "y", "(entity x time) by 1 stacked array of dependent"]], "linearmodels.panel.covariance.HeteroskedasticCovariance": [[439, 6, 1, 0, "ALLOWED_KWARGS", ""], [440, 6, 1, 0, "DEFAULT_KERNEL", ""], [441, 3, 1, 0, "cov", "Estimated covariance"], [442, 4, 1, 0, "deferred_cov", "Covariance calculation deferred until executed"], [443, 3, 1, 0, "eps", "Model residuals"], [444, 3, 1, 0, "name", "Covariance estimator name"], [445, 3, 1, 0, "s2", "Error variance"]], "linearmodels.panel.covariance.HeteroskedasticCovariance.__init__": [[438, 2, 2, 0, "debiased", "Flag indicating whether to debias the estimator"], [438, 2, 2, 0, "entity_ids", "(entity x time) by 1 stacked array of entity ids"], [438, 2, 2, 0, "extra_df", "Additional degrees of freedom consumed by models beyond the number of columns in x, e.g., fixed effects."], [438, 2, 2, 0, "params", "variables by 1 array of estimated model parameters"], [438, 2, 2, 0, "time_ids", "(entity x time) by 1 stacked array of time ids"], [438, 2, 2, 0, "x", "(entity x time) by variables stacked array of exogenous"], [438, 2, 2, 0, "y", "(entity x time) by 1 stacked array of dependent"]], "linearmodels.panel.covariance.HomoskedasticCovariance": [[447, 6, 1, 0, "ALLOWED_KWARGS", ""], [448, 6, 1, 0, "DEFAULT_KERNEL", ""], [449, 3, 1, 0, "cov", "Estimated covariance"], [450, 4, 1, 0, "deferred_cov", "Covariance calculation deferred until executed"], [451, 3, 1, 0, "eps", "Model residuals"], [452, 3, 1, 0, "name", "Covariance estimator name"], [453, 3, 1, 0, "s2", "Error variance"]], "linearmodels.panel.covariance.HomoskedasticCovariance.__init__": [[446, 2, 2, 0, "debiased", "Flag indicating whether to debias the estimator"], [446, 2, 2, 0, "entity_ids", "(entity x time) by 1 stacked array of entity ids"], [446, 2, 2, 0, "extra_df", "Additional degrees of freedom consumed by models beyond the number of columns in x, e.g., fixed effects."], [446, 2, 2, 0, "params", "variables by 1 array of estimated model parameters"], [446, 2, 2, 0, "time_ids", "(entity x time) by 1 stacked array of time ids"], [446, 2, 2, 0, "x", "(entity x time) by variables stacked array of exogenous"], [446, 2, 2, 0, "y", "(entity x time) by 1 stacked array of dependent"]], "linearmodels.panel.data": [[454, 1, 1, 0, "PanelData", "Abstraction to handle alternative formats for panel data"], [479, 1, 1, 0, "_Panel", "Convert a MI DataFrame to a 3-d structure where columns are items."]], "linearmodels.panel.data.PanelData": [[455, 4, 1, 0, "copy", "Return a deep copy"], [456, 4, 1, 0, "count", "Count number of observations by entity or time"], [457, 3, 1, 0, "dataframe", "pandas DataFrame view of data"], [458, 4, 1, 0, "demean", "Demeans data by either entity or time group"], [459, 4, 1, 0, "drop", "Drop observations from the panel."], [460, 4, 1, 0, "dummies", "Generate entity or time dummies"], [461, 3, 1, 0, "entities", "List of entity index names"], [462, 3, 1, 0, "entity_ids", "Get array containing entity group membership information"], [463, 4, 1, 0, "first_difference", "Compute first differences of variables"], [464, 4, 1, 0, "general_demean", "Multi-way demeaning using only groupby"], [465, 3, 1, 0, "index", "Return the index of the multi-index dataframe view"], [466, 3, 1, 0, "isnull", "Locations with missing observations"], [467, 4, 1, 0, "mean", "Compute data mean by either entity or time group"], [468, 3, 1, 0, "ndim", "Number of dimensions of panel view of data"], [469, 3, 1, 0, "nentity", "Number of entities"], [470, 3, 1, 0, "nobs", "Number of time observations"], [471, 3, 1, 0, "nvar", "Number of variables"], [472, 3, 1, 0, "panel", "pandas Panel view of data"], [473, 3, 1, 0, "shape", "Shape of panel view of data"], [474, 3, 1, 0, "time", "List of time index names"], [475, 3, 1, 0, "time_ids", "Get array containing time membership information"], [476, 3, 1, 0, "values2d", "NumPy ndarray view of dataframe"], [477, 3, 1, 0, "values3d", "NumPy ndarray view of panel"], [478, 3, 1, 0, "vars", "List of variable names"]], "linearmodels.panel.data.PanelData.__init__": [[454, 2, 2, 0, "convert_dummies", "Flat indicating whether pandas categoricals or string input data should be converted to dummy variables"], [454, 2, 2, 0, "copy", "Flag indicating whether to copy the input."], [454, 2, 2, 0, "drop_first", "Flag indicating to drop first dummy category when converting"], [454, 2, 2, 0, "var_name", "Variable name to use when naming variables in NumPy arrays or xarray DataArrays"], [454, 2, 2, 0, "x", "Input data"]], "linearmodels.panel.data.PanelData.count": [[456, 2, 2, 0, "group", "Group to count"]], "linearmodels.panel.data.PanelData.demean": [[458, 2, 2, 0, "group", "Group to use in demeaning"], [458, 2, 2, 0, "low_memory", "Flag indicating whether to use a low memory implementation that avoids constructing dummy variables."], [458, 2, 2, 0, "return_panel", "Flag indicating to return a PanelData object."], [458, 2, 2, 0, "weights", "Weights to implement weighted averaging"]], "linearmodels.panel.data.PanelData.drop": [[459, 2, 2, 0, "locs", "Boolean array indicating observations to drop with reference to the dataframe view of the data"]], "linearmodels.panel.data.PanelData.dummies": [[460, 2, 2, 0, "drop_first", "Flag indicating that the dummy column corresponding to the first entity or time period should be dropped"], [460, 2, 2, 0, "group", "Type of dummies to generate"]], "linearmodels.panel.data.PanelData.general_demean": [[464, 2, 2, 0, "groups", "Arrays with the same size containing group identifiers"], [464, 2, 2, 0, "weights", "Weights to use in the weighted demeaning"]], "linearmodels.panel.data.PanelData.mean": [[467, 2, 2, 0, "group", "Group to use in demeaning"], [467, 2, 2, 0, "weights", "Weights to implement weighted averaging"]], "linearmodels.panel.data._Panel": [[480, 4, 1, 0, "from_array", ""], [481, 3, 1, 0, "items", ""], [482, 3, 1, 0, "major_axis", ""], [483, 3, 1, 0, "minor_axis", ""], [484, 3, 1, 0, "shape", ""], [485, 4, 1, 0, "to_frame", ""], [486, 3, 1, 0, "values", ""]], "linearmodels.panel.data._Panel.__init__": [[479, 2, 2, 0, "df", "MultiIndex DataFrame containing floats"]], "linearmodels.panel.data._Panel.from_array": [[480, 2, 2, "linearmodels.panel.data._Panel.from_array", "items", ""], [480, 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1, 0, "has_constant", "Flag indicating the model a constant or implicit constant"], [517, 3, 1, 0, "not_null", "Locations of non-missing observations"], [518, 3, 1, 0, "other_effects", "Flag indicating whether other (generic) effects are included"], [519, 4, 1, 0, "predict", "Predict values for additional data"], [520, 4, 1, 0, "reformat_clusters", "Reformat cluster variables"], [521, 3, 1, 0, "time_effects", "Flag indicating whether time effects are included"]], "linearmodels.panel.model.PanelOLS.__init__": [[511, 2, 2, 0, "check_rank", "Flag indicating whether to perform a rank check on the exogenous variables to ensure that the model is identified."], [511, 2, 2, 0, "dependent", "Dependent (left-hand-side) variable (time by entity)."], [511, 2, 2, 0, "drop_absorbed", "Flag indicating whether to drop absorbed variables"], [511, 2, 2, 0, "entity_effects", "Flag whether to include entity (fixed) effects in the model"], [511, 2, 2, 0, "exog", "Exogenous or right-hand-side variables 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"f_statistic_robust", "Joint test of significance for non-constant regressors"], [553, 3, 1, 0, "fitted_values", "Fitted values"], [554, 3, 1, 0, "idiosyncratic", "Idiosyncratic error"], [555, 3, 1, 0, "loglik", "Log-likelihood of model"], [556, 3, 1, 0, "model_ss", "Residual sum of squares"], [557, 3, 1, 0, "name", "Model name"], [558, 3, 1, 0, "nobs", "Number of observations used to estimate the model"], [559, 3, 1, 0, "params", "Estimated parameters"], [560, 4, 1, 0, "predict", "In- and out-of-sample predictions"], [561, 3, 1, 0, "pvalues", "Parameter p-vals. Uses t(df_resid) if debiased is True, else normal"], [562, 3, 1, 0, "resid_ss", "Residual sum of squares"], [563, 3, 1, 0, "resids", "Model residuals"], [564, 3, 1, 0, "rsquared", "Model Coefficient of determination"], [565, 3, 1, 0, "rsquared_between", "Between Coefficient of determination"], [566, 3, 1, 0, "rsquared_overall", "Overall coefficient of determination"], [567, 3, 1, 0, "rsquared_within", "Within coefficient of determination"], [568, 3, 1, 0, "s2", "Residual variance estimator"], [569, 3, 1, 0, "std_errors", "Estimated parameter standard errors"], [570, 3, 1, 0, "summary", "Model estimation summary."], [571, 3, 1, 0, "time_info", "Statistics on observations per time interval"], [572, 3, 1, 0, "total_ss", "Total sum of squares"], [573, 3, 1, 0, "tstats", "Parameter t-statistics"], [574, 4, 1, 0, "wald_test", "Test linear equality constraints using a Wald test"], [575, 3, 1, 0, "wresids", "Weighted model residuals"]], "linearmodels.panel.results.FamaMacBethResults.__init__": [[538, 2, 2, "linearmodels.panel.results.FamaMacBethResults", "res", "Results container for Fama MacBeth panel data models"]], "linearmodels.panel.results.FamaMacBethResults.conf_int": [[542, 2, 2, 0, "level", "Confidence level for interval"]], "linearmodels.panel.results.FamaMacBethResults.predict": [[560, 2, 2, 0, "data", "DataFrame to use for out-of-sample predictions when model was constructed using a formula."], [560, 2, 2, 0, "effects", "Flag indicating whether to include estimated effects"], [560, 2, 2, 0, "exog", "Exogenous values to use in out-of-sample prediction (nobs by nexog)"], [560, 2, 2, 0, "fitted", "Flag indicating whether to include the fitted values"], [560, 2, 2, 0, "idiosyncratic", "Flag indicating whether to include the estimated idiosyncratic shock"], [560, 2, 2, 0, "missing", "Flag indicating to adjust for dropped observations."]], "linearmodels.panel.results.FamaMacBethResults.wald_test": [[574, 2, 2, 0, "formula", "formulaic linear constraints."], [574, 2, 2, 0, "restriction", "q by nvar array containing linear weights to apply to parameters when forming the restrictions."], [574, 2, 2, 0, "value", "q element array containing the restricted values."]], "linearmodels.panel.results.PanelEffectsResults": [[577, 4, 1, 0, "conf_int", "Confidence interval construction"], [578, 3, 1, 0, "corr_squared_between", "Between Coefficient of determination using squared correlation"], [579, 3, 1, 0, "corr_squared_overall", "Overall coefficient of determination using squared correlation"], [580, 3, 1, 0, "corr_squared_within", "Within coefficient of determination using squared correlation"], [581, 3, 1, 0, "cov", "Estimated covariance of parameters"], [582, 3, 1, 0, "df_model", "Model degree of freedom"], [583, 3, 1, 0, "df_resid", "Residual degree of freedom"], [584, 3, 1, 0, "entity_info", "Statistics on observations per entity"], [585, 3, 1, 0, "estimated_effects", "Estimated effects"], [586, 3, 1, 0, "f_pooled", "Test that included effects are jointly zero."], [587, 3, 1, 0, "f_statistic", "Joint test of significance for non-constant regressors"], [588, 3, 1, 0, "f_statistic_robust", "Joint test of significance for non-constant regressors"], [589, 3, 1, 0, "fitted_values", "Fitted values"], [590, 3, 1, 0, "idiosyncratic", "Idiosyncratic error"], [591, 3, 1, 0, "included_effects", "List of effects included in the model"], [592, 3, 1, 0, "loglik", "Log-likelihood of model"], [593, 3, 1, 0, "model_ss", "Residual sum of squares"], [594, 3, 1, 0, "name", "Model name"], [595, 3, 1, 0, "nobs", "Number of observations used to estimate the model"], [596, 3, 1, 0, "other_info", "Statistics on observations per group for other effects"], [597, 3, 1, 0, "params", "Estimated parameters"], [598, 4, 1, 0, "predict", "In- and out-of-sample predictions"], [599, 3, 1, 0, "pvalues", "Parameter p-vals. Uses t(df_resid) if debiased is True, else normal"], [600, 3, 1, 0, "resid_ss", "Residual sum of squares"], [601, 3, 1, 0, "resids", "Model residuals"], [602, 3, 1, 0, "rsquared", "Model Coefficient of determination"], [603, 3, 1, 0, "rsquared_between", "Between Coefficient of determination"], [604, 3, 1, 0, "rsquared_inclusive", "Model Coefficient of determination including fit of included effects"], [605, 3, 1, 0, "rsquared_overall", "Overall coefficient of determination"], [606, 3, 1, 0, "rsquared_within", "Within coefficient of determination"], [607, 3, 1, 0, "s2", "Residual variance estimator"], [608, 3, 1, 0, "std_errors", "Estimated parameter standard errors"], [609, 3, 1, 0, "summary", "Model estimation summary."], [610, 3, 1, 0, "time_info", "Statistics on observations per time interval"], [611, 3, 1, 0, "total_ss", "Total sum of squares"], [612, 3, 1, 0, "tstats", "Parameter t-statistics"], [613, 3, 1, 0, "variance_decomposition", "Decomposition of total variance into effects and residuals"], [614, 4, 1, 0, "wald_test", "Test linear equality constraints using a Wald test"], [615, 3, 1, 0, "wresids", "Weighted model residuals"]], "linearmodels.panel.results.PanelEffectsResults.__init__": [[576, 2, 2, "linearmodels.panel.results.PanelEffectsResults", "res", "Results container for panel data models that include effects"]], "linearmodels.panel.results.PanelEffectsResults.conf_int": [[577, 2, 2, 0, "level", "Confidence level for interval"]], "linearmodels.panel.results.PanelEffectsResults.predict": [[598, 2, 2, 0, "data", "DataFrame to use for out-of-sample predictions when model was constructed using a formula."], [598, 2, 2, 0, "effects", "Flag indicating whether to include estimated effects"], [598, 2, 2, 0, "exog", "Exogenous values to use in out-of-sample prediction (nobs by nexog)"], [598, 2, 2, 0, "fitted", "Flag indicating whether to include the fitted values"], [598, 2, 2, 0, "idiosyncratic", "Flag indicating whether to include the estimated idiosyncratic shock"], [598, 2, 2, 0, "missing", "Flag indicating to adjust for dropped observations."]], "linearmodels.panel.results.PanelEffectsResults.wald_test": [[614, 2, 2, 0, "formula", "formulaic linear constraints."], [614, 2, 2, 0, "restriction", "q by nvar array containing linear weights to apply to parameters when forming the restrictions."], [614, 2, 2, 0, "value", "q element array containing the restricted values."]], "linearmodels.panel.results.PanelModelComparison": [[617, 3, 1, 0, "cov_estimator", "Covariance estimator descriptions"], [618, 3, 1, 0, "estimator_method", "Estimation methods"], [619, 3, 1, 0, "f_statistic", "F-statistics and P-values"], [620, 3, 1, 0, "nobs", "Parameters for all models"], [621, 3, 1, 0, "params", "Parameters for all models"], [622, 3, 1, 0, "pvalues", "Parameter p-vals for all models"], [623, 3, 1, 0, "rsquared", "Coefficients of determination (R**2)"], [624, 3, 1, 0, "rsquared_between", "Coefficients of determination (R**2)"], [625, 3, 1, 0, "rsquared_overall", "Coefficients of determination (R**2)"], [626, 3, 1, 0, "rsquared_within", "Coefficients of determination (R**2)"], [627, 3, 1, 0, "std_errors", "Parameter standard errors for all models"], [628, 3, 1, 0, "summary", "Model estimation summary."], [629, 3, 1, 0, "tstats", "Parameter t-stats for all models"]], "linearmodels.panel.results.PanelModelComparison.__init__": [[616, 2, 2, 0, "precision", "Estimator precision estimator to include in the comparison output. Default is \"tstats\"."], [616, 2, 2, 0, "results", "Set of results to compare."], [616, 2, 2, 0, "stars", "Add stars based on the p-value of the coefficient where 1, 2 and 3-stars correspond to p-values of 10%, 5% and 1%, respectively."]], "linearmodels.panel.results.PanelResults": [[631, 4, 1, 0, "conf_int", "Confidence interval construction"], [632, 3, 1, 0, "corr_squared_between", "Between Coefficient of determination using squared correlation"], [633, 3, 1, 0, "corr_squared_overall", "Overall coefficient of determination using squared correlation"], [634, 3, 1, 0, "corr_squared_within", "Within coefficient of determination using squared correlation"], [635, 3, 1, 0, "cov", "Estimated covariance of parameters"], [636, 3, 1, 0, "df_model", "Model degree of freedom"], [637, 3, 1, 0, "df_resid", "Residual degree of freedom"], [638, 3, 1, 0, "entity_info", "Statistics on observations per entity"], [639, 3, 1, 0, "estimated_effects", "Estimated effects"], [640, 3, 1, 0, "f_statistic", "Joint test of significance for non-constant regressors"], [641, 3, 1, 0, "f_statistic_robust", "Joint test of significance for non-constant regressors"], [642, 3, 1, 0, "fitted_values", "Fitted values"], [643, 3, 1, 0, "idiosyncratic", "Idiosyncratic error"], [644, 3, 1, 0, "loglik", "Log-likelihood of model"], [645, 3, 1, 0, "model_ss", "Residual sum of squares"], [646, 3, 1, 0, "name", "Model name"], [647, 3, 1, 0, "nobs", "Number of observations used to estimate the model"], [648, 3, 1, 0, "params", "Estimated parameters"], [649, 4, 1, 0, "predict", "In- and out-of-sample predictions"], [650, 3, 1, 0, "pvalues", "Parameter p-vals. Uses t(df_resid) if debiased is True, else normal"], [651, 3, 1, 0, "resid_ss", "Residual sum of squares"], [652, 3, 1, 0, "resids", "Model residuals"], [653, 3, 1, 0, "rsquared", "Model Coefficient of determination"], [654, 3, 1, 0, "rsquared_between", "Between Coefficient of determination"], [655, 3, 1, 0, "rsquared_overall", "Overall coefficient of determination"], [656, 3, 1, 0, "rsquared_within", "Within coefficient of determination"], [657, 3, 1, 0, "s2", "Residual variance estimator"], [658, 3, 1, 0, "std_errors", "Estimated parameter standard errors"], [659, 3, 1, 0, "summary", "Model estimation summary."], [660, 3, 1, 0, "time_info", "Statistics on observations per time interval"], [661, 3, 1, 0, "total_ss", "Total sum of squares"], [662, 3, 1, 0, "tstats", "Parameter t-statistics"], [663, 4, 1, 0, "wald_test", "Test linear equality constraints using a Wald test"], [664, 3, 1, 0, "wresids", "Weighted model residuals"]], "linearmodels.panel.results.PanelResults.__init__": [[630, 2, 2, "linearmodels.panel.results.PanelResults", "res", "Results container for panel data models that do not include effects"]], "linearmodels.panel.results.PanelResults.conf_int": [[631, 2, 2, 0, "level", "Confidence level for interval"]], "linearmodels.panel.results.PanelResults.predict": [[649, 2, 2, 0, "data", "DataFrame to use for out-of-sample predictions when model was constructed using a formula."], [649, 2, 2, 0, "effects", "Flag indicating whether to include estimated effects"], [649, 2, 2, 0, "exog", "Exogenous values to use in out-of-sample prediction (nobs by nexog)"], [649, 2, 2, 0, "fitted", "Flag indicating whether to include the fitted values"], [649, 2, 2, 0, "idiosyncratic", "Flag indicating whether to include the estimated idiosyncratic shock"], [649, 2, 2, 0, "missing", "Flag indicating to adjust for dropped observations."]], "linearmodels.panel.results.PanelResults.wald_test": [[663, 2, 2, 0, "formula", "formulaic linear constraints."], [663, 2, 2, 0, "restriction", "q by nvar array containing linear weights to apply to parameters when forming the restrictions."], [663, 2, 2, 0, "value", "q element array containing the restricted values."]], "linearmodels.panel.results.RandomEffectsResults": [[666, 4, 1, 0, "conf_int", "Confidence interval construction"], [667, 3, 1, 0, "corr_squared_between", "Between Coefficient of determination using squared correlation"], [668, 3, 1, 0, "corr_squared_overall", "Overall coefficient of determination using squared correlation"], [669, 3, 1, 0, "corr_squared_within", "Within coefficient of determination using squared correlation"], [670, 3, 1, 0, "cov", "Estimated covariance of parameters"], [671, 3, 1, 0, "df_model", "Model degree of freedom"], [672, 3, 1, 0, "df_resid", "Residual degree of freedom"], [673, 3, 1, 0, "entity_info", "Statistics on observations per entity"], [674, 3, 1, 0, "estimated_effects", "Estimated effects"], [675, 3, 1, 0, "f_statistic", "Joint test of significance for non-constant regressors"], [676, 3, 1, 0, "f_statistic_robust", "Joint test of significance for non-constant regressors"], [677, 3, 1, 0, "fitted_values", "Fitted values"], [678, 3, 1, 0, "idiosyncratic", "Idiosyncratic error"], [679, 3, 1, 0, "loglik", "Log-likelihood of model"], [680, 3, 1, 0, "model_ss", "Residual sum of squares"], [681, 3, 1, 0, "name", "Model name"], [682, 3, 1, 0, "nobs", "Number of observations used to estimate the model"], [683, 3, 1, 0, "params", "Estimated parameters"], [684, 4, 1, 0, "predict", "In- and out-of-sample predictions"], [685, 3, 1, 0, "pvalues", "Parameter p-vals. Uses t(df_resid) if debiased is True, else normal"], [686, 3, 1, 0, "resid_ss", "Residual sum of squares"], [687, 3, 1, 0, "resids", "Model residuals"], [688, 3, 1, 0, "rsquared", "Model Coefficient of determination"], [689, 3, 1, 0, "rsquared_between", "Between Coefficient of determination"], [690, 3, 1, 0, "rsquared_overall", "Overall coefficient of determination"], [691, 3, 1, 0, "rsquared_within", "Within coefficient of determination"], [692, 3, 1, 0, "s2", "Residual variance estimator"], [693, 3, 1, 0, "std_errors", "Estimated parameter standard errors"], [694, 3, 1, 0, "summary", "Model estimation summary."], [695, 3, 1, 0, "theta", "Values used in generalized demeaning"], [696, 3, 1, 0, "time_info", "Statistics on observations per time interval"], [697, 3, 1, 0, "total_ss", "Total sum of squares"], [698, 3, 1, 0, "tstats", "Parameter t-statistics"], [699, 3, 1, 0, "variance_decomposition", "Decomposition of total variance into effects and residuals"], [700, 4, 1, 0, "wald_test", "Test linear equality constraints using a Wald test"], [701, 3, 1, 0, "wresids", "Weighted model residuals"]], "linearmodels.panel.results.RandomEffectsResults.__init__": [[665, 2, 2, "linearmodels.panel.results.RandomEffectsResults", "res", "Results container for random effect panel data models"]], "linearmodels.panel.results.RandomEffectsResults.conf_int": [[666, 2, 2, 0, "level", "Confidence level for interval"]], "linearmodels.panel.results.RandomEffectsResults.predict": [[684, 2, 2, 0, "data", "DataFrame to use for out-of-sample predictions when model was constructed using a formula."], [684, 2, 2, 0, "effects", "Flag indicating whether to include estimated effects"], [684, 2, 2, 0, "exog", "Exogenous values to use in out-of-sample prediction (nobs by nexog)"], [684, 2, 2, 0, "fitted", "Flag indicating whether to include the fitted values"], [684, 2, 2, 0, "idiosyncratic", "Flag indicating whether to include the estimated idiosyncratic shock"], [684, 2, 2, 0, "missing", "Flag indicating to adjust for dropped observations."]], "linearmodels.panel.results.RandomEffectsResults.wald_test": [[700, 2, 2, 0, "formula", "formulaic linear constraints."], [700, 2, 2, 0, "restriction", "q by nvar array containing linear weights to apply to parameters when forming the restrictions."], [700, 2, 2, 0, "value", "q element array containing the restricted values."]], "linearmodels.panel.results.compare": [[702, 2, 2, 0, "precision", "Estimator precision estimator to include in the comparison output. Default is \"tstats\"."], [702, 2, 2, 0, "results", "Set of results to compare."], [702, 2, 2, 0, "stars", "Add stars based on the p-value of the coefficient where 1, 2 and 3-stars correspond to p-values of 10%, 5% and 1%, respectively."]], "linearmodels.panel.utility": [[703, 1, 1, 0, "PanelModelData", "Typed namedtuple to hold simulated panel data"], [710, 5, 1, 0, "generate_panel_data", "Simulate panel data for testing"]], "linearmodels.panel.utility.PanelModelData": [[704, 6, 1, 0, "clusters", "Alias for field number 3"], [705, 4, 1, 0, "count", "Return number of occurrences of value."], [706, 6, 1, 0, "data", "Alias for field number 0"], [707, 4, 1, 0, "index", "Return first index of value."], [708, 6, 1, 0, "other_effects", "Alias for field number 2"], [709, 6, 1, 0, "weights", "Alias for field number 1"]], "linearmodels.panel.utility.PanelModelData.__init__": [[703, 2, 2, 0, "clusters", "DataFrame containing cluster ids."], [703, 2, 2, 0, "data", "DataFrame containing the panel model's data"], [703, 2, 2, 0, "other_effects", "DataFrame containing the panel model's effects, excluding time and entity effects."], [703, 2, 2, 0, "weights", "DataFrame containing  the panel model's weights"]], "linearmodels.panel.utility.PanelModelData.count": [[705, 2, 2, "linearmodels.panel.utility.PanelModelData.count", "value", "Return number of occurrences of value."]], "linearmodels.panel.utility.PanelModelData.index": [[707, 2, 2, "linearmodels.panel.utility.PanelModelData.index", "start", "Return first index of value."], [707, 2, 2, "linearmodels.panel.utility.PanelModelData.index", "stop", "Return first index of value."], [707, 2, 2, "linearmodels.panel.utility.PanelModelData.index", "value", "Return first index of value."]], "linearmodels.panel.utility.generate_panel_data": [[710, 2, 2, 0, "const", "Flag indicating that the model should include a constant."], [710, 2, 2, 0, "missing", "The percentage of values that are missing."], [710, 2, 2, 0, "ncats", "The number of categories to use in other_effects and variance clusters."], [710, 2, 2, 0, "nentity", "The number of entities in the panel."], [710, 2, 2, 0, "nexog", "The number of explanatory variables in the dataset."], [710, 2, 2, 0, "ntime", "The number of time periods in the panel."], [710, 2, 2, 0, "other_effects", "The number of other effects generated."], [710, 2, 2, 0, "rng", "A NumPy RandomState instance."]], "linearmodels.shared.covariance": [[868, 5, 1, 0, "cov_cluster", "Core cluster covariance estimator"], [869, 5, 1, 0, "cov_kernel", "Core kernel covariance estimator"], [870, 5, 1, 0, "group_debias_coefficient", "Compute the group debiasing scale."]], "linearmodels.shared.covariance.cov_cluster": [[868, 2, 2, 0, "clusters", "n by 1 array"], [868, 2, 2, 0, "z", "n by k mean zero data array"]], "linearmodels.shared.covariance.cov_kernel": [[869, 2, 2, 0, "w", "m by 1"], [869, 2, 2, 0, "z", "n by k mean zero data array"]], "linearmodels.shared.covariance.group_debias_coefficient": [[870, 2, 2, 0, "clusters", "One-dimensional array containing cluster group membership."]], "linearmodels.shared.hypotheses": [[871, 1, 1, 0, "InvalidTestStatistic", "Class returned if a requested test is not valid for a model"], [876, 1, 1, 0, "WaldTestStatistic", "Test statistic holder for Wald-type tests"]], "linearmodels.shared.hypotheses.InvalidTestStatistic": [[872, 3, 1, 0, "critical_values", "Always returns None"], [873, 3, 1, 0, "null", "Null hypothesis"], [874, 3, 1, 0, "pval", "Always returns np.nan"], [875, 3, 1, 0, "stat", "Test statistic"]], "linearmodels.shared.hypotheses.InvalidTestStatistic.__init__": [[871, 2, 2, 0, "name", "Name of test"], [871, 2, 2, 0, "reason", "Explanation why test is invalid"]], "linearmodels.shared.hypotheses.WaldTestStatistic": [[877, 3, 1, 0, "critical_values", "Critical values test for common test sizes"], [878, 3, 1, 0, "null", "Null hypothesis"], [879, 3, 1, 0, "pval", "P-value of test statistic"], [880, 3, 1, 0, "stat", "Test statistic"]], "linearmodels.shared.hypotheses.WaldTestStatistic.__init__": [[876, 2, 2, 0, "df", "Degree of freedom."], [876, 2, 2, 0, "df_denom", "Numerator degree of freedom."], [876, 2, 2, 0, "name", "Name of test"], [876, 2, 2, 0, "null", "A statement of the test's null hypothesis"], [876, 2, 2, 0, "stat", "The test statistic"]], "linearmodels.shared.utility": [[881, 1, 1, 0, "AttrDict", "Ordered dictionary-like object that exposes keys as attributes"]], "linearmodels.shared.utility.AttrDict": [[882, 4, 1, 0, "clear", "Remove all items from AD."], [883, 4, 1, 0, "copy", "Create a shallow copy of AD"], [884, 4, 1, 0, "get", ""], [885, 4, 1, 0, "items", "Return an ordered list-like object providing a view on AD's items"], [886, 4, 1, 0, "keys", "Return an ordered list-like object providing a view on AD's keys"], [887, 4, 1, 0, "pop", "Remove specified key and return the corresponding value. If key is not found, default is returned if given, otherwise KeyError is raised"], [888, 4, 1, 0, "popitem", "as a 2-tuple; but raise KeyError if D is empty."], [889, 4, 1, 0, "setdefault", ""], [890, 4, 1, 0, "update", "Update AD from dictionary or iterable E and F. If E is present and has a .keys() method, then does:  for k in E: AD[k] = E[k] If E is present and lacks a .keys() method, then does:  for k, v in E: AD[k] = v In either case, this is followed by: for k in F:  AD[k] = F[k]"], [891, 4, 1, 0, "values", "Return an ordered list-like object object providing a view on AD's values"]], "linearmodels.shared.utility.AttrDict.__init__": [[881, 2, 2, "linearmodels.shared.utility.AttrDict", "args", "Ordered dictionary-like object that exposes keys as attributes"], [881, 2, 2, "linearmodels.shared.utility.AttrDict", "kwargs", "Ordered dictionary-like object that exposes keys as attributes"]], "linearmodels.shared.utility.AttrDict.get": [[884, 2, 2, "linearmodels.shared.utility.AttrDict.get", "d", ""], [884, 2, 2, "linearmodels.shared.utility.AttrDict.get", "k", ""]], "linearmodels.shared.utility.AttrDict.pop": [[887, 2, 2, "linearmodels.shared.utility.AttrDict.pop", "default", "Remove specified key and return the corresponding value. If key is not found, default is returned if given, otherwise KeyError is raised"], [887, 2, 2, "linearmodels.shared.utility.AttrDict.pop", "key", "Remove specified key and return the corresponding value. If key is not found, default is returned if given, otherwise KeyError is raised"]], "linearmodels.shared.utility.AttrDict.setdefault": [[889, 2, 2, "linearmodels.shared.utility.AttrDict.setdefault", "d", ""], [889, 2, 2, "linearmodels.shared.utility.AttrDict.setdefault", "k", ""]], "linearmodels.shared.utility.AttrDict.update": [[890, 2, 2, "linearmodels.shared.utility.AttrDict.update", "args", "Update AD from dictionary or iterable E and F. If E is present and has a .keys() method, then does:  for k in E: AD[k] = E[k] If E is present and lacks a .keys() method, then does:  for k, v in E: AD[k] = v In either case, this is followed by: for k in F:  AD[k] = F[k]"], [890, 2, 2, "linearmodels.shared.utility.AttrDict.update", "kwargs", "Update AD from dictionary or iterable E and F. If E is present and has a .keys() method, then does:  for k in E: AD[k] = E[k] If E is present and lacks a .keys() method, then does:  for k, v in E: AD[k] = v In either case, this is followed by: for k in F:  AD[k] = F[k]"]], "linearmodels.system": [[719, 0, 0, 1, "covariance", ""], [719, 0, 0, 1, "gmm", ""], [719, 0, 0, 1, "model", ""], [719, 0, 0, 1, "results", ""]], "linearmodels.system.covariance": [[720, 1, 1, 0, "ClusteredCovariance", "Heteroskedastic covariance estimation for system regression"], [724, 1, 1, 0, "GMMHeteroskedasticCovariance", "Covariance estimator for IV system estimation with homoskedastic data"], [727, 1, 1, 0, "GMMHomoskedasticCovariance", "Covariance estimator for IV system estimation with homoskedastic data"], [730, 1, 1, 0, "GMMKernelCovariance", "Covariance estimator for IV system estimation with homoskedastic data"], [735, 1, 1, 0, "HeteroskedasticCovariance", "Heteroskedastic covariance estimation for system regression"], [739, 1, 1, 0, "HomoskedasticCovariance", "Homoskedastic covariance estimation for system regression"], [743, 1, 1, 0, "KernelCovariance", "Kernel (HAC) covariance estimation for system regression"]], "linearmodels.system.covariance.ClusteredCovariance": [[721, 3, 1, 0, "cov", "Parameter covariance"], [722, 3, 1, 0, "cov_config", "Optional configuration information used in covariance"], [723, 3, 1, 0, "sigma", "Error covariance"]], "linearmodels.system.covariance.ClusteredCovariance.__init__": [[720, 2, 2, 0, "clusters", "Optional array of cluster id."], [720, 2, 2, 0, "constraints", "Constraints used in estimation, if any"], [720, 2, 2, 0, "debiased", "Flag indicating to apply a small sample adjustment"], [720, 2, 2, 0, "eps", "Model residuals, ndependent by nobs"], [720, 2, 2, "linearmodels.system.covariance.ClusteredCovariance", "full_sigma", "Heteroskedastic covariance estimation for system regression"], [720, 2, 2, 0, "gls", "Flag indicating to compute the GLS covariance estimator."], [720, 2, 2, 0, "group_debias", "Flag indicating whether to debias by the number of groups."], [720, 2, 2, 0, "sigma", "Covariance matrix estimator of eps"], [720, 2, 2, 0, "x", "ndependent element list of regressor"]], "linearmodels.system.covariance.GMMHeteroskedasticCovariance": [[725, 3, 1, 0, "cov", "Parameter covariance"], [726, 3, 1, 0, "cov_config", "Optional configuration information used in covariance"]], "linearmodels.system.covariance.GMMHeteroskedasticCovariance.__init__": [[724, 2, 2, 0, "constraints", "Constraints used in estimation, if any"], [724, 2, 2, "linearmodels.system.covariance.GMMHeteroskedasticCovariance", "debiased", "Covariance estimator for IV system estimation with homoskedastic data"], [724, 2, 2, 0, "eps", "nobs by neq array of residuals where each column corresponds an equation in the system"], [724, 2, 2, 0, "sigma", "Residual covariance used in estimation"], [724, 2, 2, 0, "w", "Weighting matrix used in estimation"], [724, 2, 2, 0, "x", "List containing the model regressors for each equation in the system"], [724, 2, 2, 0, "z", "List containing the model instruments for each equation in the system"]], "linearmodels.system.covariance.GMMHomoskedasticCovariance": [[728, 3, 1, 0, "cov", "Parameter covariance"], [729, 3, 1, 0, "cov_config", "Optional configuration information used in covariance"]], "linearmodels.system.covariance.GMMHomoskedasticCovariance.__init__": [[727, 2, 2, 0, "constraints", "Constraints used in estimation, if any"], [727, 2, 2, "linearmodels.system.covariance.GMMHomoskedasticCovariance", "debiased", "Covariance estimator for IV system estimation with homoskedastic data"], [727, 2, 2, 0, "eps", "nobs by neq array of residuals where each column corresponds an equation in the system"], [727, 2, 2, 0, "sigma", "Residual covariance used in estimation"], [727, 2, 2, 0, "w", "Weighting matrix used in estimation"], [727, 2, 2, 0, "x", "List containing the model regressors for each equation in the system"], [727, 2, 2, 0, "z", "List containing the model instruments for each equation in the system"]], "linearmodels.system.covariance.GMMKernelCovariance": [[731, 3, 1, 0, "bandwidth", "Bandwidth used in estimation"], [732, 3, 1, 0, "cov", "Parameter covariance"], [733, 3, 1, 0, "cov_config", "Optional configuration information used in covariance"], [734, 3, 1, 0, "kernel", "Kernel used in estimation"]], "linearmodels.system.covariance.GMMKernelCovariance.__init__": [[730, 2, 2, 0, "bandwidth", "Bandwidth to use for the kernel."], [730, 2, 2, 0, "constraints", "Constraints used in estimation, if any"], [730, 2, 2, "linearmodels.system.covariance.GMMKernelCovariance", "debiased", "Covariance estimator for IV system estimation with homoskedastic data"], [730, 2, 2, 0, "eps", "nobs by neq array of residuals where each column corresponds an equation in the system"], [730, 2, 2, 0, "kernel", "Name of kernel to use."], [730, 2, 2, 0, "sigma", "Residual covariance used in estimation"], [730, 2, 2, 0, "w", "Weighting matrix used in estimation"], [730, 2, 2, 0, "x", "List containing the model regressors for each equation in the system"], [730, 2, 2, 0, "z", "List containing the model instruments for each equation in the system"]], "linearmodels.system.covariance.HeteroskedasticCovariance": [[736, 3, 1, 0, "cov", "Parameter covariance"], [737, 3, 1, 0, "cov_config", "Optional configuration information used in covariance"], [738, 3, 1, 0, "sigma", "Error covariance"]], "linearmodels.system.covariance.HeteroskedasticCovariance.__init__": [[735, 2, 2, 0, "constraints", "Constraints used in estimation, if any"], [735, 2, 2, 0, "debiased", "Flag indicating to apply a small sample adjustment"], [735, 2, 2, 0, "eps", "Model residuals, ndependent by nobs"], [735, 2, 2, "linearmodels.system.covariance.HeteroskedasticCovariance", "full_sigma", "Heteroskedastic covariance estimation for system regression"], [735, 2, 2, 0, "gls", "Flag indicating to compute the GLS covariance estimator."], [735, 2, 2, 0, "sigma", "Covariance matrix estimator of eps"], [735, 2, 2, 0, "x", "ndependent element list of regressor"]], "linearmodels.system.covariance.HomoskedasticCovariance": [[740, 3, 1, 0, "cov", "Parameter covariance"], [741, 3, 1, 0, "cov_config", "Optional configuration information used in covariance"], [742, 3, 1, 0, "sigma", "Error covariance"]], "linearmodels.system.covariance.HomoskedasticCovariance.__init__": [[739, 2, 2, 0, "constraints", "Constraints used in estimation, if any"], [739, 2, 2, 0, "debiased", "Flag indicating to apply a small sample adjustment"], [739, 2, 2, 0, "eps", "Model residuals, ndependent by nobs"], [739, 2, 2, "linearmodels.system.covariance.HomoskedasticCovariance", "full_sigma", "Homoskedastic covariance estimation for system regression"], [739, 2, 2, 0, "gls", "Flag indicating to compute the GLS covariance estimator."], [739, 2, 2, 0, "sigma", "Covariance matrix estimator of eps"], [739, 2, 2, 0, "x", "List of regressor arrays (ndependent)"]], "linearmodels.system.covariance.KernelCovariance": [[744, 3, 1, 0, "bandwidth", "Bandwidth used in estimation"], [745, 3, 1, 0, "cov", "Parameter covariance"], [746, 3, 1, 0, "cov_config", "Optional configuration information used in covariance"], [747, 3, 1, 0, "kernel", "Kernel used in estimation"], [748, 3, 1, 0, "sigma", "Error covariance"]], "linearmodels.system.covariance.KernelCovariance.__init__": [[743, 2, 2, 0, "bandwidth", "Bandwidth to use for the kernel."], [743, 2, 2, "linearmodels.system.covariance.KernelCovariance", "constraints", "Kernel (HAC) covariance estimation for system regression"], [743, 2, 2, 0, "debiased", "Flag indicating to apply a small sample adjustment"], [743, 2, 2, 0, "eps", "Model residuals, ndependent by nobs"], [743, 2, 2, "linearmodels.system.covariance.KernelCovariance", "full_sigma", "Kernel (HAC) covariance estimation for system regression"], [743, 2, 2, 0, "gls", "Flag indicating to compute the GLS covariance estimator."], [743, 2, 2, 0, "kernel", "Name of kernel to use."], [743, 2, 2, 0, "sigma", "Covariance matrix estimator of eps"], [743, 2, 2, 0, "x", "ndependent element list of regressor"]], "linearmodels.system.gmm": [[749, 1, 1, 0, "HeteroskedasticWeightMatrix", "Heteroskedasticity robust weight estimation"], [753, 1, 1, 0, "HomoskedasticWeightMatrix", "Homoskedastic (unadjusted) weight estimation"], [757, 1, 1, 0, "KernelWeightMatrix", "Heteroskedasticity robust weight estimation"]], "linearmodels.system.gmm.HeteroskedasticWeightMatrix": [[750, 3, 1, 0, "config", "Weight estimator configuration"], [751, 4, 1, 0, "sigma", "Estimate residual covariance."], [752, 4, 1, 0, "weight_matrix", "Construct a GMM weight matrix for a model."]], "linearmodels.system.gmm.HeteroskedasticWeightMatrix.__init__": [[749, 2, 2, 0, "center", "Flag indicating whether to center the moment conditions by subtracting the mean before computing the weight matrix."], [749, 2, 2, 0, "debiased", "Flag indicating whether to use small-sample adjustments"]], "linearmodels.system.gmm.HeteroskedasticWeightMatrix.sigma": [[751, 2, 2, 0, "eps", "The residuals from the system of equations."], [751, 2, 2, 0, "x", "A list of the regressor matrices for each equation in the system."]], "linearmodels.system.gmm.HeteroskedasticWeightMatrix.weight_matrix": [[752, 2, 2, 0, "eps", "Model errors (nobs by 1)"], [752, 2, 2, 0, "sigma", "Fixed covariance of model errors."], [752, 2, 2, 0, "x", "Model regressors (exog and endog), (nobs by nvar)"], [752, 2, 2, 0, "z", "Model instruments (exog and instruments), (nobs by ninstr)"]], "linearmodels.system.gmm.HomoskedasticWeightMatrix": [[754, 3, 1, 0, "config", "Weight estimator configuration"], [755, 4, 1, 0, "sigma", "Estimate residual covariance."], [756, 4, 1, 0, "weight_matrix", "Construct a GMM weight matrix for a model."]], "linearmodels.system.gmm.HomoskedasticWeightMatrix.__init__": [[753, 2, 2, 0, "center", "Flag indicating whether to center the moment conditions by subtracting the mean before computing the weight matrix."], [753, 2, 2, 0, "debiased", "Flag indicating whether to use small-sample adjustments"]], "linearmodels.system.gmm.HomoskedasticWeightMatrix.sigma": [[755, 2, 2, 0, "eps", "The residuals from the system of equations."], [755, 2, 2, 0, "x", "A list of the regressor matrices for each equation in the system."]], "linearmodels.system.gmm.HomoskedasticWeightMatrix.weight_matrix": [[756, 2, 2, 0, "eps", "Model errors (nobs by neqn)"], [756, 2, 2, 0, "sigma", "Fixed covariance of model errors."], [756, 2, 2, 0, "x", "List of containing model regressors for each equation in the system"], [756, 2, 2, 0, "z", "List of containing instruments for each equation in the system"]], "linearmodels.system.gmm.KernelWeightMatrix": [[758, 3, 1, 0, "bandwidth", "Bandwidth used to estimate covariance of moment conditions"], [759, 3, 1, 0, "config", "Weight estimator configuration"], [760, 3, 1, 0, "kernel", "Kernel used in estimation"], [761, 4, 1, 0, "sigma", "Estimate residual covariance."], [762, 4, 1, 0, "weight_matrix", "Construct a GMM weight matrix for a model."]], "linearmodels.system.gmm.KernelWeightMatrix.__init__": [[757, 2, 2, 0, "bandwidth", "Bandwidth to use for the kernel."], [757, 2, 2, 0, "center", "Flag indicating whether to center the moment conditions by subtracting the mean before computing the weight matrix."], [757, 2, 2, 0, "debiased", "Flag indicating whether to use small-sample adjustments"], [757, 2, 2, 0, "kernel", "Name of kernel to use."], [757, 2, 2, 0, "optimal_bw", "Flag indicating whether to estimate the optimal bandwidth, when bandwidth is None."]], "linearmodels.system.gmm.KernelWeightMatrix.sigma": [[761, 2, 2, 0, "eps", "The residuals from the system of equations."], [761, 2, 2, 0, "x", "A list of the regressor matrices for each equation in the system."]], "linearmodels.system.gmm.KernelWeightMatrix.weight_matrix": [[762, 2, 2, 0, "eps", "Model errors (nobs by nequation)"], [762, 2, 2, 0, "sigma", "Fixed covariance of model errors."], [762, 2, 2, 0, "x", "Model regressors (exog and endog)"], [762, 2, 2, 0, "z", "Model instruments (exog and instruments)"]], "linearmodels.system.model": [[763, 1, 1, 0, "IV3SLS", "Three-stage Least Squares (3SLS) Estimator"], [774, 1, 1, 0, "IVSystemGMM", "System Generalized Method of Moments (GMM) estimation of linear IV models"], [784, 1, 1, 0, "LinearConstraint", "Linear constraint for regression estimation"], [789, 1, 1, 0, "SUR", "Seemingly unrelated regression estimation (SUR/SURE)"]], "linearmodels.system.model.IV3SLS": [[764, 4, 1, 0, "add_constraints", "Add parameter constraints to a model."], [765, 3, 1, 0, "constraints", "Model constraints"], [766, 4, 1, 0, "fit", "Estimate model parameters"], [767, 3, 1, 0, "formula", "Set or get the formula used to construct the model"], [768, 4, 1, 0, "from_formula", "Specify a 3SLS using the formula interface"], [769, 3, 1, 0, "has_constant", "Vector indicating which equations contain constants"], [770, 4, 1, 0, "multivariate_iv", "Interface for specification of multivariate IV models"], [771, 3, 1, 0, "param_names", "Model parameter names"], [772, 4, 1, 0, "predict", "Predict values for additional data"], [773, 4, 1, 0, "reset_constraints", "Remove all model constraints"]], "linearmodels.system.model.IV3SLS.__init__": [[763, 2, 2, 0, "equations", "Dictionary-like structure containing dependent, exogenous, endogenous and instrumental variables."], [763, 2, 2, 0, "sigma", "Prespecified residual covariance to use in GLS estimation."]], "linearmodels.system.model.IV3SLS.add_constraints": [[764, 2, 2, 0, "q", "Constraint values (nconstraints)."], [764, 2, 2, 0, "r", "Constraint matrix."]], "linearmodels.system.model.IV3SLS.fit": [[766, 2, 2, 0, "cov_config", "Additional parameters to pass to covariance estimator."], [766, 2, 2, 0, "cov_type", "Name of covariance estimator."], [766, 2, 2, 0, "full_cov", "Flag indicating whether to utilize information in correlations when estimating the model with GLS"], [766, 2, 2, 0, "iter_limit", "Maximum number of iterations for iterative GLS"], [766, 2, 2, 0, "iterate", "Flag indicating to iterate GLS until convergence of iter limit iterations have been completed"], [766, 2, 2, 0, "method", "Estimation method."], [766, 2, 2, 0, "tol", "Tolerance to use when checking for convergence in iterative GLS"]], "linearmodels.system.model.IV3SLS.from_formula": [[768, 2, 2, 0, "data", "Frame containing named variables"], [768, 2, 2, 0, "formula", "Either a string or a dictionary of strings where each value in the dictionary represents a single equation."], [768, 2, 2, 0, "sigma", "Prespecified residual covariance to use in GLS estimation."], [768, 2, 2, 0, "weights", "Dictionary like object (e.g."]], "linearmodels.system.model.IV3SLS.multivariate_iv": [[770, 2, 2, 0, "dependent", "nobs by ndep array of dependent variables"], [770, 2, 2, 0, "endog", "nobs by nendog array of endogenous regressors common to all models"], [770, 2, 2, 0, "exog", "nobs by nexog array of exogenous regressors common to all models"], [770, 2, 2, 0, "instruments", "nobs by ninstr array of instruments to use in all equations"]], "linearmodels.system.model.IV3SLS.predict": [[772, 2, 2, 0, "data", "Values to use when making predictions from a model constructed from a formula"], [772, 2, 2, 0, "equations", "Dictionary-like structure containing exogenous and endogenous variables."], [772, 2, 2, 0, "eval_env", "Depth to  use when evaluating formulas."], [772, 2, 2, 0, "params", "Model parameters (nvar by 1)"]], "linearmodels.system.model.IVSystemGMM": [[775, 4, 1, 0, "add_constraints", "Add parameter constraints to a model."], [776, 3, 1, 0, "constraints", "Model constraints"], [777, 4, 1, 0, "fit", "Estimate model parameters"], [778, 3, 1, 0, "formula", "Set or get the formula used to construct the model"], [779, 4, 1, 0, "from_formula", "Specify a 3SLS using the formula interface"], [780, 3, 1, 0, "has_constant", "Vector indicating which equations contain constants"], [781, 3, 1, 0, "param_names", "Model parameter names"], [782, 4, 1, 0, "predict", "Predict values for additional data"], [783, 4, 1, 0, "reset_constraints", "Remove all model constraints"]], "linearmodels.system.model.IVSystemGMM.__init__": [[774, 2, 2, 0, "equations", "Dictionary-like structure containing dependent, exogenous, endogenous and instrumental variables."], [774, 2, 2, 0, "sigma", "Prespecified residual covariance to use in GLS estimation."], [774, 2, 2, "linearmodels.system.model.IVSystemGMM", "weight_config", "System Generalized Method of Moments (GMM) estimation of linear IV models"], [774, 2, 2, 0, "weight_type", "Name of moment condition weight function to use in the GMM estimation"]], "linearmodels.system.model.IVSystemGMM.add_constraints": [[775, 2, 2, 0, "q", "Constraint values (nconstraints)."], [775, 2, 2, 0, "r", "Constraint matrix."]], "linearmodels.system.model.IVSystemGMM.fit": [[777, 2, 2, 0, "cov_config", "Additional parameters to pass to covariance estimator."], [777, 2, 2, 0, "cov_type", "Name of covariance estimator."], [777, 2, 2, 0, "initial_weight", "Initial weighting matrix to use in the first step."], [777, 2, 2, 0, "iter_limit", "Maximum number of iterations for iterative GLS"], [777, 2, 2, 0, "tol", "Tolerance to use when checking for convergence in iterative GLS"]], "linearmodels.system.model.IVSystemGMM.from_formula": [[779, 2, 2, 0, "data", "Frame containing named variables"], [779, 2, 2, 0, "formula", "Either a string or a dictionary of strings where each value in the dictionary represents a single equation."], [779, 2, 2, "linearmodels.system.model.IVSystemGMM.from_formula", "weight_config", "Specify a 3SLS using the formula interface"], [779, 2, 2, 0, "weight_type", "Name of moment condition weight function to use in the GMM estimation."], [779, 2, 2, 0, "weights", "Dictionary like object (e.g."]], "linearmodels.system.model.IVSystemGMM.predict": [[782, 2, 2, 0, "data", "Values to use when making predictions from a model constructed from a formula"], [782, 2, 2, 0, "equations", "Dictionary-like structure containing exogenous and endogenous variables."], [782, 2, 2, 0, "eval_env", "Depth to  use when evaluating formulas."], [782, 2, 2, 0, "params", "Model parameters (nvar by 1)"]], "linearmodels.system.model.LinearConstraint": [[785, 3, 1, 0, "a", "Transformed constraint target"], [786, 3, 1, 0, "q", "Constrain target values"], [787, 3, 1, 0, "r", "Constraint loading matrix"], [788, 3, 1, 0, "t", "Constraint transformation matrix"]], "linearmodels.system.model.LinearConstraint.__init__": [[784, 2, 2, 0, "num_params", "Number of model parameter."], [784, 2, 2, 0, "q", "Restriction value"], [784, 2, 2, 0, "r", "Restriction loading matrix"], [784, 2, 2, 0, "require_pandas", "Flag indicating whether r and q must be pandas"]], "linearmodels.system.model.SUR": [[790, 4, 1, 0, "add_constraints", "Add parameter constraints to a model."], [791, 3, 1, 0, "constraints", "Model constraints"], [792, 4, 1, 0, "fit", "Estimate model parameters"], [793, 3, 1, 0, "formula", "Set or get the formula used to construct the model"], [794, 4, 1, 0, "from_formula", "Specify a SUR using the formula interface"], [795, 3, 1, 0, "has_constant", "Vector indicating which equations contain constants"], [796, 4, 1, 0, "multivariate_ls", "Interface for specification of multivariate regression models"], [797, 3, 1, 0, "param_names", "Model parameter names"], [798, 4, 1, 0, "predict", "Predict values for additional data"], [799, 4, 1, 0, "reset_constraints", "Remove all model constraints"]], "linearmodels.system.model.SUR.__init__": [[789, 2, 2, 0, "equations", "Dictionary-like structure containing dependent and exogenous variable values."], [789, 2, 2, 0, "sigma", "Prespecified residual covariance to use in GLS estimation."]], "linearmodels.system.model.SUR.add_constraints": [[790, 2, 2, 0, "q", "Constraint values (nconstraints)."], [790, 2, 2, 0, "r", "Constraint matrix."]], "linearmodels.system.model.SUR.fit": [[792, 2, 2, 0, "cov_config", "Additional parameters to pass to covariance estimator."], [792, 2, 2, 0, "cov_type", "Name of covariance estimator."], [792, 2, 2, 0, "full_cov", "Flag indicating whether to utilize information in correlations when estimating the model with GLS"], [792, 2, 2, 0, "iter_limit", "Maximum number of iterations for iterative GLS"], [792, 2, 2, 0, "iterate", "Flag indicating to iterate GLS until convergence of iter limit iterations have been completed"], [792, 2, 2, 0, "method", "Estimation method."], [792, 2, 2, 0, "tol", "Tolerance to use when checking for convergence in iterative GLS"]], "linearmodels.system.model.SUR.from_formula": [[794, 2, 2, 0, "data", "Frame containing named variables"], [794, 2, 2, 0, "formula", "Either a string or a dictionary of strings where each value in the dictionary represents a single equation."], [794, 2, 2, 0, "sigma", "Prespecified residual covariance to use in GLS estimation."], [794, 2, 2, 0, "weights", "Dictionary like object (e.g."]], "linearmodels.system.model.SUR.multivariate_ls": [[796, 2, 2, 0, "dependent", "nobs by ndep array of dependent variables"], [796, 2, 2, 0, "exog", "nobs by nvar array of exogenous regressors common to all models"]], "linearmodels.system.model.SUR.predict": [[798, 2, 2, 0, "data", "Values to use when making predictions from a model constructed from a formula"], [798, 2, 2, 0, "equations", "Dictionary-like structure containing exogenous and endogenous variables."], [798, 2, 2, 0, "eval_env", "Depth to  use when evaluating formulas."], [798, 2, 2, 0, "params", "Model parameters (nvar by 1)"]], "linearmodels.system.results": [[800, 1, 1, 0, "GMMSystemResults", "Results from GMM System Estimators"], [835, 1, 1, 0, "SystemResults", "Results from Seemingly Unrelated Regression Estimators"]], "linearmodels.system.results.GMMSystemResults": [[801, 4, 1, 0, "breusch_pagan", "Breusch-Pagan LM test for no cross-correlation"], [802, 4, 1, 0, "conf_int", "Confidence interval construction"], [803, 3, 1, 0, "cov", "Estimated covariance of parameters"], [804, 3, 1, 0, "cov_config", "Configuration of covariance estimator used to compute covariance"], [805, 3, 1, 0, "cov_estimator", "Type of covariance estimator used to compute covariance"], [806, 3, 1, 0, "debiased", "Flag indicating whether covariance uses a small-sample adjustment"], [807, 3, 1, 0, "df_model", "Model degree of freedom"], [808, 3, 1, 0, "df_resid", "Residual degree of freedom"], [809, 3, 1, 0, "equation_labels", "Individual equation labels"], [810, 3, 1, 0, "equations", "Individual equation results"], [811, 3, 1, 0, "fitted_values", "Fitted values"], [812, 3, 1, 0, "iterations", "Number of iterations of the GLS executed"], [813, 3, 1, 0, "j_stat", "J-test of overidentifying restrictions"], [814, 4, 1, 0, "likelihood_ratio", "Likelihood ratio test of no cross-correlation"], [815, 3, 1, 0, "method", "Estimation method"], [816, 3, 1, 0, "model", "Model used in 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718, 749, 753, 757], "central": 714, "certain": [397, 763, 789], "cgrant": [150, 396], "cgrant_1": [150, 396], "challeng": 397, "chang": [69, 77, 79, 89, 90, 151, 153, 224, 397, 399, 402, 714, 716], "chapter": [149, 150, 397, 714], "charact": 77, "characterist": [149, 151, 397], "cheatham": 150, "check": [77, 149, 182, 212, 223, 234, 246, 257, 490, 498, 506, 511, 515, 522, 525, 533, 766, 777, 792], "check_rank": [396, 487, 490, 495, 498, 503, 506, 511, 515, 522, 525, 530, 533], "chem": [69, 70], "chemic": [69, 70], "chi": [71, 132, 149, 150, 272, 287, 304, 322, 323, 333, 356, 357, 359, 391, 552, 574, 588, 614, 641, 663, 676, 700, 801, 813, 814, 836, 848], "chi2": [69, 70, 72, 114, 148, 149, 150, 151, 153, 268, 281, 334, 371, 714, 716], "chi_": [73, 351, 394, 718], "child": 150, "chisquar": 715, "choic": [149, 153, 198, 394, 400, 403, 513, 552, 588, 641, 676, 716, 718], "choos": [21, 235, 496], "christoph": 713, "christophid": 150, "chronic": [149, 151], "chrsemp": [150, 396], 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diff --git a/devel/sitemap.xml b/devel/sitemap.xml
index 9b93a5e765..aea357ebd9 100644
--- a/devel/sitemap.xml
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ffects.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.model.PooledOLS.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.model.PooledOLS.fit.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.model.PooledOLS.formula.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.model.PooledOLS.from_formula.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.model.PooledOLS.has_constant.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.model.PooledOLS.not_null.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.model.PooledOLS.predict.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.FamaMacBethResults.avg_rsquared.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.model.PooledOLS.reformat_clusters.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.FamaMacBethResults.conf_int.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.model.RandomEffects.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.FamaMacBethResults.corr_squared_between.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.FamaMacBethResults.corr_squared_overall.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.FamaMacBethResults.corr_squared_within.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.FamaMacBethResults.cov.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.FamaMacBethResults.df_model.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.FamaMacBethResults.df_resid.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.FamaMacBethResults.entity_info.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.FamaMacBethResults.estimated_effects.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.FamaMacBethResults.f_statistic.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.FamaMacBethResults.f_statistic_robust.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.FamaMacBethResults.fitted_values.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.FamaMacBethResults.idiosyncratic.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.PanelEffectsResults.nobs.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.FamaMacBethResults.loglik.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.FamaMacBethResults.model_ss.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.PanelEffectsResults.other_info.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.FamaMacBethResults.name.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.PanelEffectsResults.params.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.FamaMacBethResults.nobs.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.FamaMacBethResults.params.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.PanelEffectsResults.predict.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.FamaMacBethResults.predict.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.PanelEffectsResults.pvalues.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.FamaMacBethResults.pvalues.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.PanelEffectsResults.resid_ss.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.FamaMacBethResults.resid_ss.html</loc></url><url><loc>https://bashtage.github.io/linearmodels/panel/panel/linearmodels.panel.results.FamaMacBethResu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diff --git a/devel/system/examples/examples.html b/devel/system/examples/examples.html
index 4804a9bb3b..540e91f780 100644
--- a/devel/system/examples/examples.html
+++ b/devel/system/examples/examples.html
@@ -15,7 +15,7 @@
     
   
       
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+    linearmodels v6.1 (+15)
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 <style type="text/css">
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+<table id="T_21c25">
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-      <th id="T_ab4e0_level0_col2" class="col_heading level0 col2" >WC</th>
-      <th id="T_ab4e0_level0_col3" class="col_heading level0 col3" >MT</th>
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-      <th id="T_ab4e0_level0_col5" class="col_heading level0 col5" >MA</th>
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-      <th id="T_ab4e0_level0_col8" class="col_heading level0 col8" >CN</th>
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+      <th id="T_21c25_level0_col1" class="col_heading level0 col1" >SW</th>
+      <th id="T_21c25_level0_col2" class="col_heading level0 col2" >WC</th>
+      <th id="T_21c25_level0_col3" class="col_heading level0 col3" >MT</th>
+      <th id="T_21c25_level0_col4" class="col_heading level0 col4" >NE</th>
+      <th id="T_21c25_level0_col5" class="col_heading level0 col5" >MA</th>
+      <th id="T_21c25_level0_col6" class="col_heading level0 col6" >SO</th>
+      <th id="T_21c25_level0_col7" class="col_heading level0 col7" >MW</th>
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   <tbody>
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-      <td id="T_ab4e0_row0_col8" class="data row0 col8" >0.325</td>
+      <th id="T_21c25_level0_row0" class="row_heading level0 row0" >GF</th>
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+      <td id="T_21c25_row0_col1" class="data row0 col1" >0.173</td>
+      <td id="T_21c25_row0_col2" class="data row0 col2" >0.447</td>
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     <tr>
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-      <td id="T_ab4e0_row1_col1" class="data row1 col1" >1.000</td>
-      <td id="T_ab4e0_row1_col2" class="data row1 col2" >0.697</td>
-      <td id="T_ab4e0_row1_col3" class="data row1 col3" >-0.290</td>
-      <td id="T_ab4e0_row1_col4" class="data row1 col4" >0.489</td>
-      <td id="T_ab4e0_row1_col5" class="data row1 col5" >0.132</td>
-      <td id="T_ab4e0_row1_col6" class="data row1 col6" >0.314</td>
-      <td id="T_ab4e0_row1_col7" class="data row1 col7" >0.565</td>
-      <td id="T_ab4e0_row1_col8" class="data row1 col8" >0.119</td>
+      <th id="T_21c25_level0_row1" class="row_heading level0 row1" >SW</th>
+      <td id="T_21c25_row1_col0" class="data row1 col0" >0.173</td>
+      <td id="T_21c25_row1_col1" class="data row1 col1" >1.000</td>
+      <td id="T_21c25_row1_col2" class="data row1 col2" >0.697</td>
+      <td id="T_21c25_row1_col3" class="data row1 col3" >-0.290</td>
+      <td id="T_21c25_row1_col4" class="data row1 col4" >0.489</td>
+      <td id="T_21c25_row1_col5" class="data row1 col5" >0.132</td>
+      <td id="T_21c25_row1_col6" class="data row1 col6" >0.314</td>
+      <td id="T_21c25_row1_col7" class="data row1 col7" >0.565</td>
+      <td id="T_21c25_row1_col8" class="data row1 col8" >0.119</td>
     </tr>
     <tr>
-      <th id="T_ab4e0_level0_row2" class="row_heading level0 row2" >WC</th>
-      <td id="T_ab4e0_row2_col0" class="data row2 col0" >0.447</td>
-      <td id="T_ab4e0_row2_col1" class="data row2 col1" >0.697</td>
-      <td id="T_ab4e0_row2_col2" class="data row2 col2" >1.000</td>
-      <td id="T_ab4e0_row2_col3" class="data row2 col3" >-0.537</td>
-      <td id="T_ab4e0_row2_col4" class="data row2 col4" >0.343</td>
-      <td id="T_ab4e0_row2_col5" class="data row2 col5" >0.130</td>
-      <td id="T_ab4e0_row2_col6" class="data row2 col6" >0.505</td>
-      <td id="T_ab4e0_row2_col7" class="data row2 col7" >0.574</td>
-      <td id="T_ab4e0_row2_col8" class="data row2 col8" >0.037</td>
+      <th id="T_21c25_level0_row2" class="row_heading level0 row2" >WC</th>
+      <td id="T_21c25_row2_col0" class="data row2 col0" >0.447</td>
+      <td id="T_21c25_row2_col1" class="data row2 col1" >0.697</td>
+      <td id="T_21c25_row2_col2" class="data row2 col2" >1.000</td>
+      <td id="T_21c25_row2_col3" class="data row2 col3" >-0.537</td>
+      <td id="T_21c25_row2_col4" class="data row2 col4" >0.343</td>
+      <td id="T_21c25_row2_col5" class="data row2 col5" >0.130</td>
+      <td id="T_21c25_row2_col6" class="data row2 col6" >0.505</td>
+      <td id="T_21c25_row2_col7" class="data row2 col7" >0.574</td>
+      <td id="T_21c25_row2_col8" class="data row2 col8" >0.037</td>
     </tr>
     <tr>
-      <th id="T_ab4e0_level0_row3" class="row_heading level0 row3" >MT</th>
-      <td id="T_ab4e0_row3_col0" class="data row3 col0" >-0.547</td>
-      <td id="T_ab4e0_row3_col1" class="data row3 col1" >-0.290</td>
-      <td id="T_ab4e0_row3_col2" class="data row3 col2" >-0.537</td>
-      <td id="T_ab4e0_row3_col3" class="data row3 col3" >1.000</td>
-      <td id="T_ab4e0_row3_col4" class="data row3 col4" >-0.241</td>
-      <td id="T_ab4e0_row3_col5" class="data row3 col5" >-0.322</td>
-      <td id="T_ab4e0_row3_col6" class="data row3 col6" >-0.351</td>
-      <td id="T_ab4e0_row3_col7" class="data row3 col7" >-0.058</td>
-      <td id="T_ab4e0_row3_col8" class="data row3 col8" >0.091</td>
+      <th id="T_21c25_level0_row3" class="row_heading level0 row3" >MT</th>
+      <td id="T_21c25_row3_col0" class="data row3 col0" >-0.547</td>
+      <td id="T_21c25_row3_col1" class="data row3 col1" >-0.290</td>
+      <td id="T_21c25_row3_col2" class="data row3 col2" >-0.537</td>
+      <td id="T_21c25_row3_col3" class="data row3 col3" >1.000</td>
+      <td id="T_21c25_row3_col4" class="data row3 col4" >-0.241</td>
+      <td id="T_21c25_row3_col5" class="data row3 col5" >-0.322</td>
+      <td id="T_21c25_row3_col6" class="data row3 col6" >-0.351</td>
+      <td id="T_21c25_row3_col7" class="data row3 col7" >-0.058</td>
+      <td id="T_21c25_row3_col8" class="data row3 col8" >0.091</td>
     </tr>
     <tr>
-      <th id="T_ab4e0_level0_row4" class="row_heading level0 row4" >NE</th>
-      <td id="T_ab4e0_row4_col0" class="data row4 col0" >0.525</td>
-      <td id="T_ab4e0_row4_col1" class="data row4 col1" >0.489</td>
-      <td id="T_ab4e0_row4_col2" class="data row4 col2" >0.343</td>
-      <td id="T_ab4e0_row4_col3" class="data row4 col3" >-0.241</td>
-      <td id="T_ab4e0_row4_col4" class="data row4 col4" >1.000</td>
-      <td id="T_ab4e0_row4_col5" class="data row4 col5" >0.259</td>
-      <td id="T_ab4e0_row4_col6" class="data row4 col6" >0.783</td>
-      <td id="T_ab4e0_row4_col7" class="data row4 col7" >0.269</td>
-      <td id="T_ab4e0_row4_col8" class="data row4 col8" >0.200</td>
+      <th id="T_21c25_level0_row4" class="row_heading level0 row4" >NE</th>
+      <td id="T_21c25_row4_col0" class="data row4 col0" >0.525</td>
+      <td id="T_21c25_row4_col1" class="data row4 col1" >0.489</td>
+      <td id="T_21c25_row4_col2" class="data row4 col2" >0.343</td>
+      <td id="T_21c25_row4_col3" class="data row4 col3" >-0.241</td>
+      <td id="T_21c25_row4_col4" class="data row4 col4" >1.000</td>
+      <td id="T_21c25_row4_col5" class="data row4 col5" >0.259</td>
+      <td id="T_21c25_row4_col6" class="data row4 col6" >0.783</td>
+      <td id="T_21c25_row4_col7" class="data row4 col7" >0.269</td>
+      <td id="T_21c25_row4_col8" class="data row4 col8" >0.200</td>
     </tr>
     <tr>
-      <th id="T_ab4e0_level0_row5" class="row_heading level0 row5" >MA</th>
-      <td id="T_ab4e0_row5_col0" class="data row5 col0" >0.425</td>
-      <td id="T_ab4e0_row5_col1" class="data row5 col1" >0.132</td>
-      <td id="T_ab4e0_row5_col2" class="data row5 col2" >0.130</td>
-      <td id="T_ab4e0_row5_col3" class="data row5 col3" >-0.322</td>
-      <td id="T_ab4e0_row5_col4" class="data row5 col4" >0.259</td>
-      <td id="T_ab4e0_row5_col5" class="data row5 col5" >1.000</td>
-      <td id="T_ab4e0_row5_col6" class="data row5 col6" >0.388</td>
-      <td id="T_ab4e0_row5_col7" class="data row5 col7" >-0.037</td>
-      <td id="T_ab4e0_row5_col8" class="data row5 col8" >0.713</td>
+      <th id="T_21c25_level0_row5" class="row_heading level0 row5" >MA</th>
+      <td id="T_21c25_row5_col0" class="data row5 col0" >0.425</td>
+      <td id="T_21c25_row5_col1" class="data row5 col1" >0.132</td>
+      <td id="T_21c25_row5_col2" class="data row5 col2" >0.130</td>
+      <td id="T_21c25_row5_col3" class="data row5 col3" >-0.322</td>
+      <td id="T_21c25_row5_col4" class="data row5 col4" >0.259</td>
+      <td id="T_21c25_row5_col5" class="data row5 col5" >1.000</td>
+      <td id="T_21c25_row5_col6" class="data row5 col6" >0.388</td>
+      <td id="T_21c25_row5_col7" class="data row5 col7" >-0.037</td>
+      <td id="T_21c25_row5_col8" class="data row5 col8" >0.713</td>
     </tr>
     <tr>
-      <th id="T_ab4e0_level0_row6" class="row_heading level0 row6" >SO</th>
-      <td id="T_ab4e0_row6_col0" class="data row6 col0" >0.763</td>
-      <td id="T_ab4e0_row6_col1" class="data row6 col1" >0.314</td>
-      <td id="T_ab4e0_row6_col2" class="data row6 col2" >0.505</td>
-      <td id="T_ab4e0_row6_col3" class="data row6 col3" >-0.351</td>
-      <td id="T_ab4e0_row6_col4" class="data row6 col4" >0.783</td>
-      <td id="T_ab4e0_row6_col5" class="data row6 col5" >0.388</td>
-      <td id="T_ab4e0_row6_col6" class="data row6 col6" >1.000</td>
-      <td id="T_ab4e0_row6_col7" class="data row6 col7" >0.366</td>
-      <td id="T_ab4e0_row6_col8" class="data row6 col8" >0.350</td>
+      <th id="T_21c25_level0_row6" class="row_heading level0 row6" >SO</th>
+      <td id="T_21c25_row6_col0" class="data row6 col0" >0.763</td>
+      <td id="T_21c25_row6_col1" class="data row6 col1" >0.314</td>
+      <td id="T_21c25_row6_col2" class="data row6 col2" >0.505</td>
+      <td id="T_21c25_row6_col3" class="data row6 col3" >-0.351</td>
+      <td id="T_21c25_row6_col4" class="data row6 col4" >0.783</td>
+      <td id="T_21c25_row6_col5" class="data row6 col5" >0.388</td>
+      <td id="T_21c25_row6_col6" class="data row6 col6" >1.000</td>
+      <td id="T_21c25_row6_col7" class="data row6 col7" >0.366</td>
+      <td id="T_21c25_row6_col8" class="data row6 col8" >0.350</td>
     </tr>
     <tr>
-      <th id="T_ab4e0_level0_row7" class="row_heading level0 row7" >MW</th>
-      <td id="T_ab4e0_row7_col0" class="data row7 col0" >0.167</td>
-      <td id="T_ab4e0_row7_col1" class="data row7 col1" >0.565</td>
-      <td id="T_ab4e0_row7_col2" class="data row7 col2" >0.574</td>
-      <td id="T_ab4e0_row7_col3" class="data row7 col3" >-0.058</td>
-      <td id="T_ab4e0_row7_col4" class="data row7 col4" >0.269</td>
-      <td id="T_ab4e0_row7_col5" class="data row7 col5" >-0.037</td>
-      <td id="T_ab4e0_row7_col6" class="data row7 col6" >0.366</td>
-      <td id="T_ab4e0_row7_col7" class="data row7 col7" >1.000</td>
-      <td id="T_ab4e0_row7_col8" class="data row7 col8" >0.298</td>
+      <th id="T_21c25_level0_row7" class="row_heading level0 row7" >MW</th>
+      <td id="T_21c25_row7_col0" class="data row7 col0" >0.167</td>
+      <td id="T_21c25_row7_col1" class="data row7 col1" >0.565</td>
+      <td id="T_21c25_row7_col2" class="data row7 col2" >0.574</td>
+      <td id="T_21c25_row7_col3" class="data row7 col3" >-0.058</td>
+      <td id="T_21c25_row7_col4" class="data row7 col4" >0.269</td>
+      <td id="T_21c25_row7_col5" class="data row7 col5" >-0.037</td>
+      <td id="T_21c25_row7_col6" class="data row7 col6" >0.366</td>
+      <td id="T_21c25_row7_col7" class="data row7 col7" >1.000</td>
+      <td id="T_21c25_row7_col8" class="data row7 col8" >0.298</td>
     </tr>
     <tr>
-      <th id="T_ab4e0_level0_row8" class="row_heading level0 row8" >CN</th>
-      <td id="T_ab4e0_row8_col0" class="data row8 col0" >0.325</td>
-      <td id="T_ab4e0_row8_col1" class="data row8 col1" >0.119</td>
-      <td id="T_ab4e0_row8_col2" class="data row8 col2" >0.037</td>
-      <td id="T_ab4e0_row8_col3" class="data row8 col3" >0.091</td>
-      <td id="T_ab4e0_row8_col4" class="data row8 col4" >0.200</td>
-      <td id="T_ab4e0_row8_col5" class="data row8 col5" >0.713</td>
-      <td id="T_ab4e0_row8_col6" class="data row8 col6" >0.350</td>
-      <td id="T_ab4e0_row8_col7" class="data row8 col7" >0.298</td>
-      <td id="T_ab4e0_row8_col8" class="data row8 col8" >1.000</td>
+      <th id="T_21c25_level0_row8" class="row_heading level0 row8" >CN</th>
+      <td id="T_21c25_row8_col0" class="data row8 col0" >0.325</td>
+      <td id="T_21c25_row8_col1" class="data row8 col1" >0.119</td>
+      <td id="T_21c25_row8_col2" class="data row8 col2" >0.037</td>
+      <td id="T_21c25_row8_col3" class="data row8 col3" >0.091</td>
+      <td id="T_21c25_row8_col4" class="data row8 col4" >0.200</td>
+      <td id="T_21c25_row8_col5" class="data row8 col5" >0.713</td>
+      <td id="T_21c25_row8_col6" class="data row8 col6" >0.350</td>
+      <td id="T_21c25_row8_col7" class="data row8 col7" >0.298</td>
+      <td id="T_21c25_row8_col8" class="data row8 col8" >1.000</td>
     </tr>
   </tbody>
 </table></div>
@@ -1231,7 +1231,7 @@ <h2 id="Basic-Usage">Basic Usage<a class="headerlink" href="#Basic-Usage" title=
 No. Equations.:                     9   McElroy&#39;s R-squared:                 0.9988
 No. Observations:                  17   Judge&#39;s (OLS) R-squared:             0.9937
 Date:                Tue, Sep 24 2024   Berndt&#39;s R-squared:                  1.0000
-Time:                        09:24:33   Dhrymes&#39;s R-squared:                 0.9937
+Time:                        09:28:45   Dhrymes&#39;s R-squared:                 0.9937
                                         Cov. Estimator:                  unadjusted
                                         Num. Constraints:                      None
                    Equation: GF, Dependent Variable: lnGSP
@@ -1281,7 +1281,7 @@ <h2 id="Basic-Usage">Basic Usage<a class="headerlink" href="#Basic-Usage" title=
 Estimator:                        GLS   Cov. Estimator:             unadjusted
 No. Observations:                  17   F-statistic:                    2862.4
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000
-Time:                        09:24:33   Distribution:                  chi2(6)
+Time:                        09:28:45   Distribution:                  chi2(6)
 
                              Parameter Estimates
 ==============================================================================
@@ -1323,109 +1323,109 @@ <h2 id="Basic-Usage">Basic Usage<a class="headerlink" href="#Basic-Usage" title=
 <div class="output_area rendered_html docutils container">
 <style type="text/css">
 </style>
-<table id="T_7385c">
+<table id="T_fac83">
   <thead>
     <tr>
       <th class="blank level0" >&nbsp;</th>
-      <th id="T_7385c_level0_col0" class="col_heading level0 col0" >Intercept</th>
-      <th id="T_7385c_level0_col1" class="col_heading level0 col1" >lnPC</th>
-      <th id="T_7385c_level0_col2" class="col_heading level0 col2" >lnHWY</th>
-      <th id="T_7385c_level0_col3" class="col_heading level0 col3" >lnWATER</th>
-      <th id="T_7385c_level0_col4" class="col_heading level0 col4" >lnUTIL</th>
-      <th id="T_7385c_level0_col5" class="col_heading level0 col5" >lnEMP</th>
-      <th id="T_7385c_level0_col6" class="col_heading level0 col6" >UNEMP</th>
+      <th id="T_fac83_level0_col0" class="col_heading level0 col0" >Intercept</th>
+      <th id="T_fac83_level0_col1" class="col_heading level0 col1" >lnPC</th>
+      <th id="T_fac83_level0_col2" class="col_heading level0 col2" >lnHWY</th>
+      <th id="T_fac83_level0_col3" class="col_heading level0 col3" >lnWATER</th>
+      <th id="T_fac83_level0_col4" class="col_heading level0 col4" >lnUTIL</th>
+      <th id="T_fac83_level0_col5" class="col_heading level0 col5" >lnEMP</th>
+      <th id="T_fac83_level0_col6" class="col_heading level0 col6" >UNEMP</th>
     </tr>
   </thead>
   <tbody>
     <tr>
-      <th id="T_7385c_level0_row0" class="row_heading level0 row0" >GF</th>
-      <td id="T_7385c_row0_col0" class="data row0 col0" >12.310</td>
-      <td id="T_7385c_row0_col1" class="data row0 col1" >-0.201</td>
-      <td id="T_7385c_row0_col2" class="data row0 col2" >-1.886</td>
-      <td id="T_7385c_row0_col3" class="data row0 col3" >0.178</td>
-      <td id="T_7385c_row0_col4" class="data row0 col4" >1.190</td>
-      <td id="T_7385c_row0_col5" class="data row0 col5" >0.953</td>
-      <td id="T_7385c_row0_col6" class="data row0 col6" >-0.003</td>
+      <th id="T_fac83_level0_row0" class="row_heading level0 row0" >GF</th>
+      <td id="T_fac83_row0_col0" class="data row0 col0" >12.310</td>
+      <td id="T_fac83_row0_col1" class="data row0 col1" >-0.201</td>
+      <td id="T_fac83_row0_col2" class="data row0 col2" >-1.886</td>
+      <td id="T_fac83_row0_col3" class="data row0 col3" >0.178</td>
+      <td id="T_fac83_row0_col4" class="data row0 col4" >1.190</td>
+      <td id="T_fac83_row0_col5" class="data row0 col5" >0.953</td>
+      <td id="T_fac83_row0_col6" class="data row0 col6" >-0.003</td>
     </tr>
     <tr>
-      <th id="T_7385c_level0_row1" class="row_heading level0 row1" >SW</th>
-      <td id="T_7385c_row1_col0" class="data row1 col0" >4.083</td>
-      <td id="T_7385c_row1_col1" class="data row1 col1" >0.077</td>
-      <td id="T_7385c_row1_col2" class="data row1 col2" >-0.131</td>
-      <td id="T_7385c_row1_col3" class="data row1 col3" >-0.136</td>
-      <td id="T_7385c_row1_col4" class="data row1 col4" >0.522</td>
-      <td id="T_7385c_row1_col5" class="data row1 col5" >0.539</td>
-      <td id="T_7385c_row1_col6" class="data row1 col6" >-0.016</td>
+      <th id="T_fac83_level0_row1" class="row_heading level0 row1" >SW</th>
+      <td id="T_fac83_row1_col0" class="data row1 col0" >4.083</td>
+      <td id="T_fac83_row1_col1" class="data row1 col1" >0.077</td>
+      <td id="T_fac83_row1_col2" class="data row1 col2" >-0.131</td>
+      <td id="T_fac83_row1_col3" class="data row1 col3" >-0.136</td>
+      <td id="T_fac83_row1_col4" class="data row1 col4" >0.522</td>
+      <td id="T_fac83_row1_col5" class="data row1 col5" >0.539</td>
+      <td id="T_fac83_row1_col6" class="data row1 col6" >-0.016</td>
     </tr>
     <tr>
-      <th id="T_7385c_level0_row2" class="row_heading level0 row2" >WC</th>
-      <td id="T_7385c_row2_col0" class="data row2 col0" >1.960</td>
-      <td id="T_7385c_row2_col1" class="data row2 col1" >0.170</td>
-      <td id="T_7385c_row2_col2" class="data row2 col2" >0.132</td>
-      <td id="T_7385c_row2_col3" class="data row2 col3" >-0.347</td>
-      <td id="T_7385c_row2_col4" class="data row2 col4" >0.090</td>
-      <td id="T_7385c_row2_col5" class="data row2 col5" >1.070</td>
-      <td id="T_7385c_row2_col6" class="data row2 col6" >-0.006</td>
+      <th id="T_fac83_level0_row2" class="row_heading level0 row2" >WC</th>
+      <td id="T_fac83_row2_col0" class="data row2 col0" >1.960</td>
+      <td id="T_fac83_row2_col1" class="data row2 col1" >0.170</td>
+      <td id="T_fac83_row2_col2" class="data row2 col2" >0.132</td>
+      <td id="T_fac83_row2_col3" class="data row2 col3" >-0.347</td>
+      <td id="T_fac83_row2_col4" class="data row2 col4" >0.090</td>
+      <td id="T_fac83_row2_col5" class="data row2 col5" >1.070</td>
+      <td id="T_fac83_row2_col6" class="data row2 col6" >-0.006</td>
     </tr>
     <tr>
-      <th id="T_7385c_level0_row3" class="row_heading level0 row3" >MT</th>
-      <td id="T_7385c_row3_col0" class="data row3 col0" >3.463</td>
-      <td id="T_7385c_row3_col1" class="data row3 col1" >-0.115</td>
-      <td id="T_7385c_row3_col2" class="data row3 col2" >0.180</td>
-      <td id="T_7385c_row3_col3" class="data row3 col3" >0.262</td>
-      <td id="T_7385c_row3_col4" class="data row3 col4" >-0.330</td>
-      <td id="T_7385c_row3_col5" class="data row3 col5" >1.079</td>
-      <td id="T_7385c_row3_col6" class="data row3 col6" >-0.001</td>
+      <th id="T_fac83_level0_row3" class="row_heading level0 row3" >MT</th>
+      <td id="T_fac83_row3_col0" class="data row3 col0" >3.463</td>
+      <td id="T_fac83_row3_col1" class="data row3 col1" >-0.115</td>
+      <td id="T_fac83_row3_col2" class="data row3 col2" >0.180</td>
+      <td id="T_fac83_row3_col3" class="data row3 col3" >0.262</td>
+      <td id="T_fac83_row3_col4" class="data row3 col4" >-0.330</td>
+      <td id="T_fac83_row3_col5" class="data row3 col5" >1.079</td>
+      <td id="T_fac83_row3_col6" class="data row3 col6" >-0.001</td>
     </tr>
     <tr>
-      <th id="T_7385c_level0_row4" class="row_heading level0 row4" >NE</th>
-      <td id="T_7385c_row4_col0" class="data row4 col0" >-12.294</td>
-      <td id="T_7385c_row4_col1" class="data row4 col1" >0.118</td>
-      <td id="T_7385c_row4_col2" class="data row4 col2" >0.934</td>
-      <td id="T_7385c_row4_col3" class="data row4 col3" >-0.557</td>
-      <td id="T_7385c_row4_col4" class="data row4 col4" >-0.290</td>
-      <td id="T_7385c_row4_col5" class="data row4 col5" >2.494</td>
-      <td id="T_7385c_row4_col6" class="data row4 col6" >0.020</td>
+      <th id="T_fac83_level0_row4" class="row_heading level0 row4" >NE</th>
+      <td id="T_fac83_row4_col0" class="data row4 col0" >-12.294</td>
+      <td id="T_fac83_row4_col1" class="data row4 col1" >0.118</td>
+      <td id="T_fac83_row4_col2" class="data row4 col2" >0.934</td>
+      <td id="T_fac83_row4_col3" class="data row4 col3" >-0.557</td>
+      <td id="T_fac83_row4_col4" class="data row4 col4" >-0.290</td>
+      <td id="T_fac83_row4_col5" class="data row4 col5" >2.494</td>
+      <td id="T_fac83_row4_col6" class="data row4 col6" >0.020</td>
     </tr>
     <tr>
-      <th id="T_7385c_level0_row5" class="row_heading level0 row5" >MA</th>
-      <td id="T_7385c_row5_col0" class="data row5 col0" >-18.616</td>
-      <td id="T_7385c_row5_col1" class="data row5 col1" >-0.311</td>
-      <td id="T_7385c_row5_col2" class="data row5 col2" >3.060</td>
-      <td id="T_7385c_row5_col3" class="data row5 col3" >-0.109</td>
-      <td id="T_7385c_row5_col4" class="data row5 col4" >-1.659</td>
-      <td id="T_7385c_row5_col5" class="data row5 col5" >2.186</td>
-      <td id="T_7385c_row5_col6" class="data row5 col6" >0.018</td>
+      <th id="T_fac83_level0_row5" class="row_heading level0 row5" >MA</th>
+      <td id="T_fac83_row5_col0" class="data row5 col0" >-18.616</td>
+      <td id="T_fac83_row5_col1" class="data row5 col1" >-0.311</td>
+      <td id="T_fac83_row5_col2" class="data row5 col2" >3.060</td>
+      <td id="T_fac83_row5_col3" class="data row5 col3" >-0.109</td>
+      <td id="T_fac83_row5_col4" class="data row5 col4" >-1.659</td>
+      <td id="T_fac83_row5_col5" class="data row5 col5" >2.186</td>
+      <td id="T_fac83_row5_col6" class="data row5 col6" >0.018</td>
     </tr>
     <tr>
-      <th id="T_7385c_level0_row6" class="row_heading level0 row6" >SO</th>
-      <td id="T_7385c_row6_col0" class="data row6 col0" >3.162</td>
-      <td id="T_7385c_row6_col1" class="data row6 col1" >-0.063</td>
-      <td id="T_7385c_row6_col2" class="data row6 col2" >-0.641</td>
-      <td id="T_7385c_row6_col3" class="data row6 col3" >-0.081</td>
-      <td id="T_7385c_row6_col4" class="data row6 col4" >0.281</td>
-      <td id="T_7385c_row6_col5" class="data row6 col5" >1.620</td>
-      <td id="T_7385c_row6_col6" class="data row6 col6" >0.008</td>
+      <th id="T_fac83_level0_row6" class="row_heading level0 row6" >SO</th>
+      <td id="T_fac83_row6_col0" class="data row6 col0" >3.162</td>
+      <td id="T_fac83_row6_col1" class="data row6 col1" >-0.063</td>
+      <td id="T_fac83_row6_col2" class="data row6 col2" >-0.641</td>
+      <td id="T_fac83_row6_col3" class="data row6 col3" >-0.081</td>
+      <td id="T_fac83_row6_col4" class="data row6 col4" >0.281</td>
+      <td id="T_fac83_row6_col5" class="data row6 col5" >1.620</td>
+      <td id="T_fac83_row6_col6" class="data row6 col6" >0.008</td>
     </tr>
     <tr>
-      <th id="T_7385c_level0_row7" class="row_heading level0 row7" >MW</th>
-      <td id="T_7385c_row7_col0" class="data row7 col0" >-9.258</td>
-      <td id="T_7385c_row7_col1" class="data row7 col1" >0.096</td>
-      <td id="T_7385c_row7_col2" class="data row7 col2" >1.612</td>
-      <td id="T_7385c_row7_col3" class="data row7 col3" >0.694</td>
-      <td id="T_7385c_row7_col4" class="data row7 col4" >-0.340</td>
-      <td id="T_7385c_row7_col5" class="data row7 col5" >-0.062</td>
-      <td id="T_7385c_row7_col6" class="data row7 col6" >-0.031</td>
+      <th id="T_fac83_level0_row7" class="row_heading level0 row7" >MW</th>
+      <td id="T_fac83_row7_col0" class="data row7 col0" >-9.258</td>
+      <td id="T_fac83_row7_col1" class="data row7 col1" >0.096</td>
+      <td id="T_fac83_row7_col2" class="data row7 col2" >1.612</td>
+      <td id="T_fac83_row7_col3" class="data row7 col3" >0.694</td>
+      <td id="T_fac83_row7_col4" class="data row7 col4" >-0.340</td>
+      <td id="T_fac83_row7_col5" class="data row7 col5" >-0.062</td>
+      <td id="T_fac83_row7_col6" class="data row7 col6" >-0.031</td>
     </tr>
     <tr>
-      <th id="T_7385c_level0_row8" class="row_heading level0 row8" >CN</th>
-      <td id="T_7385c_row8_col0" class="data row8 col0" >-3.405</td>
-      <td id="T_7385c_row8_col1" class="data row8 col1" >0.295</td>
-      <td id="T_7385c_row8_col2" class="data row8 col2" >0.934</td>
-      <td id="T_7385c_row8_col3" class="data row8 col3" >0.539</td>
-      <td id="T_7385c_row8_col4" class="data row8 col4" >0.003</td>
-      <td id="T_7385c_row8_col5" class="data row8 col5" >-0.321</td>
-      <td id="T_7385c_row8_col6" class="data row8 col6" >-0.029</td>
+      <th id="T_fac83_level0_row8" class="row_heading level0 row8" >CN</th>
+      <td id="T_fac83_row8_col0" class="data row8 col0" >-3.405</td>
+      <td id="T_fac83_row8_col1" class="data row8 col1" >0.295</td>
+      <td id="T_fac83_row8_col2" class="data row8 col2" >0.934</td>
+      <td id="T_fac83_row8_col3" class="data row8 col3" >0.539</td>
+      <td id="T_fac83_row8_col4" class="data row8 col4" >0.003</td>
+      <td id="T_fac83_row8_col5" class="data row8 col5" >-0.321</td>
+      <td id="T_fac83_row8_col6" class="data row8 col6" >-0.029</td>
     </tr>
   </tbody>
 </table></div>
@@ -1473,119 +1473,119 @@ <h2 id="Basic-Usage">Basic Usage<a class="headerlink" href="#Basic-Usage" title=
 <div class="output_area rendered_html docutils container">
 <style type="text/css">
 </style>
-<table id="T_6288c">
+<table id="T_0345b">
   <thead>
     <tr>
       <th class="blank level0" >&nbsp;</th>
-      <th id="T_6288c_level0_col0" class="col_heading level0 col0" >Intercept</th>
-      <th id="T_6288c_level0_col1" class="col_heading level0 col1" >lnPC</th>
-      <th id="T_6288c_level0_col2" class="col_heading level0 col2" >lnHWY</th>
-      <th id="T_6288c_level0_col3" class="col_heading level0 col3" >lnWATER</th>
-      <th id="T_6288c_level0_col4" class="col_heading level0 col4" >lnUTIL</th>
-      <th id="T_6288c_level0_col5" class="col_heading level0 col5" >lnEMP</th>
-      <th id="T_6288c_level0_col6" class="col_heading level0 col6" >UNEMP</th>
-      <th id="T_6288c_level0_col7" class="col_heading level0 col7" >R2</th>
+      <th id="T_0345b_level0_col0" class="col_heading level0 col0" >Intercept</th>
+      <th id="T_0345b_level0_col1" class="col_heading level0 col1" >lnPC</th>
+      <th id="T_0345b_level0_col2" class="col_heading level0 col2" >lnHWY</th>
+      <th id="T_0345b_level0_col3" class="col_heading level0 col3" >lnWATER</th>
+      <th id="T_0345b_level0_col4" class="col_heading level0 col4" >lnUTIL</th>
+      <th id="T_0345b_level0_col5" class="col_heading level0 col5" >lnEMP</th>
+      <th id="T_0345b_level0_col6" class="col_heading level0 col6" >UNEMP</th>
+      <th id="T_0345b_level0_col7" class="col_heading level0 col7" >R2</th>
     </tr>
   </thead>
   <tbody>
     <tr>
-      <th id="T_6288c_level0_row0" class="row_heading level0 row0" >GF</th>
-      <td id="T_6288c_row0_col0" class="data row0 col0" >11.567</td>
-      <td id="T_6288c_row0_col1" class="data row0 col1" >0.002</td>
-      <td id="T_6288c_row0_col2" class="data row0 col2" >-2.029</td>
-      <td id="T_6288c_row0_col3" class="data row0 col3" >0.101</td>
-      <td id="T_6288c_row0_col4" class="data row0 col4" >1.358</td>
-      <td id="T_6288c_row0_col5" class="data row0 col5" >0.805</td>
-      <td id="T_6288c_row0_col6" class="data row0 col6" >-0.007</td>
-      <td id="T_6288c_row0_col7" class="data row0 col7" >0.997</td>
+      <th id="T_0345b_level0_row0" class="row_heading level0 row0" >GF</th>
+      <td id="T_0345b_row0_col0" class="data row0 col0" >11.567</td>
+      <td id="T_0345b_row0_col1" class="data row0 col1" >0.002</td>
+      <td id="T_0345b_row0_col2" class="data row0 col2" >-2.029</td>
+      <td id="T_0345b_row0_col3" class="data row0 col3" >0.101</td>
+      <td id="T_0345b_row0_col4" class="data row0 col4" >1.358</td>
+      <td id="T_0345b_row0_col5" class="data row0 col5" >0.805</td>
+      <td id="T_0345b_row0_col6" class="data row0 col6" >-0.007</td>
+      <td id="T_0345b_row0_col7" class="data row0 col7" >0.997</td>
     </tr>
     <tr>
-      <th id="T_6288c_level0_row1" class="row_heading level0 row1" >SW</th>
-      <td id="T_6288c_row1_col0" class="data row1 col0" >3.028</td>
-      <td id="T_6288c_row1_col1" class="data row1 col1" >0.164</td>
-      <td id="T_6288c_row1_col2" class="data row1 col2" >-0.075</td>
-      <td id="T_6288c_row1_col3" class="data row1 col3" >-0.169</td>
-      <td id="T_6288c_row1_col4" class="data row1 col4" >0.637</td>
-      <td id="T_6288c_row1_col5" class="data row1 col5" >0.362</td>
-      <td id="T_6288c_row1_col6" class="data row1 col6" >-0.017</td>
-      <td id="T_6288c_row1_col7" class="data row1 col7" >0.998</td>
+      <th id="T_0345b_level0_row1" class="row_heading level0 row1" >SW</th>
+      <td id="T_0345b_row1_col0" class="data row1 col0" >3.028</td>
+      <td id="T_0345b_row1_col1" class="data row1 col1" >0.164</td>
+      <td id="T_0345b_row1_col2" class="data row1 col2" >-0.075</td>
+      <td id="T_0345b_row1_col3" class="data row1 col3" >-0.169</td>
+      <td id="T_0345b_row1_col4" class="data row1 col4" >0.637</td>
+      <td id="T_0345b_row1_col5" class="data row1 col5" >0.362</td>
+      <td id="T_0345b_row1_col6" class="data row1 col6" >-0.017</td>
+      <td id="T_0345b_row1_col7" class="data row1 col7" >0.998</td>
     </tr>
     <tr>
-      <th id="T_6288c_level0_row2" class="row_heading level0 row2" >WC</th>
-      <td id="T_6288c_row2_col0" class="data row2 col0" >3.590</td>
-      <td id="T_6288c_row2_col1" class="data row2 col1" >0.295</td>
-      <td id="T_6288c_row2_col2" class="data row2 col2" >0.174</td>
-      <td id="T_6288c_row2_col3" class="data row2 col3" >-0.226</td>
-      <td id="T_6288c_row2_col4" class="data row2 col4" >-0.214</td>
-      <td id="T_6288c_row2_col5" class="data row2 col5" >0.917</td>
-      <td id="T_6288c_row2_col6" class="data row2 col6" >-0.008</td>
-      <td id="T_6288c_row2_col7" class="data row2 col7" >0.994</td>
+      <th id="T_0345b_level0_row2" class="row_heading level0 row2" >WC</th>
+      <td id="T_0345b_row2_col0" class="data row2 col0" >3.590</td>
+      <td id="T_0345b_row2_col1" class="data row2 col1" >0.295</td>
+      <td id="T_0345b_row2_col2" class="data row2 col2" >0.174</td>
+      <td id="T_0345b_row2_col3" class="data row2 col3" >-0.226</td>
+      <td id="T_0345b_row2_col4" class="data row2 col4" >-0.214</td>
+      <td id="T_0345b_row2_col5" class="data row2 col5" >0.917</td>
+      <td id="T_0345b_row2_col6" class="data row2 col6" >-0.008</td>
+      <td id="T_0345b_row2_col7" class="data row2 col7" >0.994</td>
     </tr>
     <tr>
-      <th id="T_6288c_level0_row3" class="row_heading level0 row3" >MT</th>
-      <td id="T_6288c_row3_col0" class="data row3 col0" >6.378</td>
-      <td id="T_6288c_row3_col1" class="data row3 col1" >-0.153</td>
-      <td id="T_6288c_row3_col2" class="data row3 col2" >-0.123</td>
-      <td id="T_6288c_row3_col3" class="data row3 col3" >0.306</td>
-      <td id="T_6288c_row3_col4" class="data row3 col4" >-0.533</td>
-      <td id="T_6288c_row3_col5" class="data row3 col5" >1.344</td>
-      <td id="T_6288c_row3_col6" class="data row3 col6" >0.005</td>
-      <td id="T_6288c_row3_col7" class="data row3 col7" >0.999</td>
+      <th id="T_0345b_level0_row3" class="row_heading level0 row3" >MT</th>
+      <td id="T_0345b_row3_col0" class="data row3 col0" >6.378</td>
+      <td id="T_0345b_row3_col1" class="data row3 col1" >-0.153</td>
+      <td id="T_0345b_row3_col2" class="data row3 col2" >-0.123</td>
+      <td id="T_0345b_row3_col3" class="data row3 col3" >0.306</td>
+      <td id="T_0345b_row3_col4" class="data row3 col4" >-0.533</td>
+      <td id="T_0345b_row3_col5" class="data row3 col5" >1.344</td>
+      <td id="T_0345b_row3_col6" class="data row3 col6" >0.005</td>
+      <td id="T_0345b_row3_col7" class="data row3 col7" >0.999</td>
     </tr>
     <tr>
-      <th id="T_6288c_level0_row4" class="row_heading level0 row4" >NE</th>
-      <td id="T_6288c_row4_col0" class="data row4 col0" >-13.730</td>
-      <td id="T_6288c_row4_col1" class="data row4 col1" >-0.020</td>
-      <td id="T_6288c_row4_col2" class="data row4 col2" >0.662</td>
-      <td id="T_6288c_row4_col3" class="data row4 col3" >-0.969</td>
-      <td id="T_6288c_row4_col4" class="data row4 col4" >-0.107</td>
-      <td id="T_6288c_row4_col5" class="data row4 col5" >3.380</td>
-      <td id="T_6288c_row4_col6" class="data row4 col6" >0.034</td>
-      <td id="T_6288c_row4_col7" class="data row4 col7" >0.985</td>
+      <th id="T_0345b_level0_row4" class="row_heading level0 row4" >NE</th>
+      <td id="T_0345b_row4_col0" class="data row4 col0" >-13.730</td>
+      <td id="T_0345b_row4_col1" class="data row4 col1" >-0.020</td>
+      <td id="T_0345b_row4_col2" class="data row4 col2" >0.662</td>
+      <td id="T_0345b_row4_col3" class="data row4 col3" >-0.969</td>
+      <td id="T_0345b_row4_col4" class="data row4 col4" >-0.107</td>
+      <td id="T_0345b_row4_col5" class="data row4 col5" >3.380</td>
+      <td id="T_0345b_row4_col6" class="data row4 col6" >0.034</td>
+      <td id="T_0345b_row4_col7" class="data row4 col7" >0.985</td>
     </tr>
     <tr>
-      <th id="T_6288c_level0_row5" class="row_heading level0 row5" >MA</th>
-      <td id="T_6288c_row5_col0" class="data row5 col0" >-22.855</td>
-      <td id="T_6288c_row5_col1" class="data row5 col1" >-0.378</td>
-      <td id="T_6288c_row5_col2" class="data row5 col2" >3.348</td>
-      <td id="T_6288c_row5_col3" class="data row5 col3" >-0.264</td>
-      <td id="T_6288c_row5_col4" class="data row5 col4" >-1.778</td>
-      <td id="T_6288c_row5_col5" class="data row5 col5" >2.673</td>
-      <td id="T_6288c_row5_col6" class="data row5 col6" >0.026</td>
-      <td id="T_6288c_row5_col7" class="data row5 col7" >0.986</td>
+      <th id="T_0345b_level0_row5" class="row_heading level0 row5" >MA</th>
+      <td id="T_0345b_row5_col0" class="data row5 col0" >-22.855</td>
+      <td id="T_0345b_row5_col1" class="data row5 col1" >-0.378</td>
+      <td id="T_0345b_row5_col2" class="data row5 col2" >3.348</td>
+      <td id="T_0345b_row5_col3" class="data row5 col3" >-0.264</td>
+      <td id="T_0345b_row5_col4" class="data row5 col4" >-1.778</td>
+      <td id="T_0345b_row5_col5" class="data row5 col5" >2.673</td>
+      <td id="T_0345b_row5_col6" class="data row5 col6" >0.026</td>
+      <td id="T_0345b_row5_col7" class="data row5 col7" >0.986</td>
     </tr>
     <tr>
-      <th id="T_6288c_level0_row6" class="row_heading level0 row6" >SO</th>
-      <td id="T_6288c_row6_col0" class="data row6 col0" >3.927</td>
-      <td id="T_6288c_row6_col1" class="data row6 col1" >0.043</td>
-      <td id="T_6288c_row6_col2" class="data row6 col2" >-0.773</td>
-      <td id="T_6288c_row6_col3" class="data row6 col3" >-0.035</td>
-      <td id="T_6288c_row6_col4" class="data row6 col4" >0.140</td>
-      <td id="T_6288c_row6_col5" class="data row6 col5" >1.665</td>
-      <td id="T_6288c_row6_col6" class="data row6 col6" >0.008</td>
-      <td id="T_6288c_row6_col7" class="data row6 col7" >0.994</td>
+      <th id="T_0345b_level0_row6" class="row_heading level0 row6" >SO</th>
+      <td id="T_0345b_row6_col0" class="data row6 col0" >3.927</td>
+      <td id="T_0345b_row6_col1" class="data row6 col1" >0.043</td>
+      <td id="T_0345b_row6_col2" class="data row6 col2" >-0.773</td>
+      <td id="T_0345b_row6_col3" class="data row6 col3" >-0.035</td>
+      <td id="T_0345b_row6_col4" class="data row6 col4" >0.140</td>
+      <td id="T_0345b_row6_col5" class="data row6 col5" >1.665</td>
+      <td id="T_0345b_row6_col6" class="data row6 col6" >0.008</td>
+      <td id="T_0345b_row6_col7" class="data row6 col7" >0.994</td>
     </tr>
     <tr>
-      <th id="T_6288c_level0_row7" class="row_heading level0 row7" >MW</th>
-      <td id="T_6288c_row7_col0" class="data row7 col0" >-9.111</td>
-      <td id="T_6288c_row7_col1" class="data row7 col1" >0.233</td>
-      <td id="T_6288c_row7_col2" class="data row7 col2" >1.604</td>
-      <td id="T_6288c_row7_col3" class="data row7 col3" >0.717</td>
-      <td id="T_6288c_row7_col4" class="data row7 col4" >-0.356</td>
-      <td id="T_6288c_row7_col5" class="data row7 col5" >-0.259</td>
-      <td id="T_6288c_row7_col6" class="data row7 col6" >-0.034</td>
-      <td id="T_6288c_row7_col7" class="data row7 col7" >0.989</td>
+      <th id="T_0345b_level0_row7" class="row_heading level0 row7" >MW</th>
+      <td id="T_0345b_row7_col0" class="data row7 col0" >-9.111</td>
+      <td id="T_0345b_row7_col1" class="data row7 col1" >0.233</td>
+      <td id="T_0345b_row7_col2" class="data row7 col2" >1.604</td>
+      <td id="T_0345b_row7_col3" class="data row7 col3" >0.717</td>
+      <td id="T_0345b_row7_col4" class="data row7 col4" >-0.356</td>
+      <td id="T_0345b_row7_col5" class="data row7 col5" >-0.259</td>
+      <td id="T_0345b_row7_col6" class="data row7 col6" >-0.034</td>
+      <td id="T_0345b_row7_col7" class="data row7 col7" >0.989</td>
     </tr>
     <tr>
-      <th id="T_6288c_level0_row8" class="row_heading level0 row8" >CN</th>
-      <td id="T_6288c_row8_col0" class="data row8 col0" >-5.621</td>
-      <td id="T_6288c_row8_col1" class="data row8 col1" >0.386</td>
-      <td id="T_6288c_row8_col2" class="data row8 col2" >1.267</td>
-      <td id="T_6288c_row8_col3" class="data row8 col3" >0.546</td>
-      <td id="T_6288c_row8_col4" class="data row8 col4" >-0.108</td>
-      <td id="T_6288c_row8_col5" class="data row8 col5" >-0.475</td>
-      <td id="T_6288c_row8_col6" class="data row8 col6" >-0.031</td>
-      <td id="T_6288c_row8_col7" class="data row8 col7" >0.995</td>
+      <th id="T_0345b_level0_row8" class="row_heading level0 row8" >CN</th>
+      <td id="T_0345b_row8_col0" class="data row8 col0" >-5.621</td>
+      <td id="T_0345b_row8_col1" class="data row8 col1" >0.386</td>
+      <td id="T_0345b_row8_col2" class="data row8 col2" >1.267</td>
+      <td id="T_0345b_row8_col3" class="data row8 col3" >0.546</td>
+      <td id="T_0345b_row8_col4" class="data row8 col4" >-0.108</td>
+      <td id="T_0345b_row8_col5" class="data row8 col5" >-0.475</td>
+      <td id="T_0345b_row8_col6" class="data row8 col6" >-0.031</td>
+      <td id="T_0345b_row8_col7" class="data row8 col7" >0.995</td>
     </tr>
   </tbody>
 </table></div>
@@ -1830,7 +1830,7 @@ <h3 id="Iterative-GLS">Iterative GLS<a class="headerlink" href="#Iterative-GLS"
 No. Equations.:                     2   McElroy&#39;s R-squared:                 0.2926
 No. Observations:                 616   Judge&#39;s (OLS) R-squared:             0.2087
 Date:                Tue, Sep 24 2024   Berndt&#39;s R-squared:                  0.4822
-Time:                        09:24:34   Dhrymes&#39;s R-squared:                 0.2087
+Time:                        09:28:46   Dhrymes&#39;s R-squared:                 0.2087
                                         Cov. Estimator:                  unadjusted
                                         Num. Constraints:                      None
                  Equation: hrearn, Dependent Variable: hrearn
@@ -1893,7 +1893,7 @@ <h3 id="Iterative-GLS">Iterative GLS<a class="headerlink" href="#Iterative-GLS"
 No. Equations.:                     2   McElroy&#39;s R-squared:                 0.2926
 No. Observations:                 616   Judge&#39;s (OLS) R-squared:             0.2087
 Date:                Tue, Sep 24 2024   Berndt&#39;s R-squared:                  0.4822
-Time:                        09:24:34   Dhrymes&#39;s R-squared:                 0.2087
+Time:                        09:28:46   Dhrymes&#39;s R-squared:                 0.2087
                                         Cov. Estimator:                  unadjusted
                                         Num. Constraints:                      None
                  Equation: hrearn, Dependent Variable: hrearn
@@ -1965,7 +1965,7 @@ <h3 id="Iterative-GLS">Iterative GLS<a class="headerlink" href="#Iterative-GLS"
 No. Equations.:                     2   McElroy&#39;s R-squared:                 0.2762
 No. Observations:                 616   Judge&#39;s (OLS) R-squared:             0.1685
 Date:                Tue, Sep 24 2024   Berndt&#39;s R-squared:                  0.4504
-Time:                        09:24:34   Dhrymes&#39;s R-squared:                 0.1685
+Time:                        09:28:46   Dhrymes&#39;s R-squared:                 0.1685
                                         Cov. Estimator:                  unadjusted
                                         Num. Constraints:                      None
                  Equation: hrearn, Dependent Variable: hrearn
@@ -2018,7 +2018,7 @@ <h3 id="Iterative-GLS">Iterative GLS<a class="headerlink" href="#Iterative-GLS"
 No. Equations.:                     2   McElroy&#39;s R-squared:                 0.2749
 No. Observations:                 616   Judge&#39;s (OLS) R-squared:             0.1685
 Date:                Tue, Sep 24 2024   Berndt&#39;s R-squared:                  0.4532
-Time:                        09:24:34   Dhrymes&#39;s R-squared:                 0.1685
+Time:                        09:28:46   Dhrymes&#39;s R-squared:                 0.1685
                                         Cov. Estimator:                  unadjusted
                                         Num. Constraints:                      None
                  Equation: hrearn, Dependent Variable: hrearn
@@ -2092,7 +2092,7 @@ <h4 id="Heteroskedasticity-Robust-Covariance-Estimation">Heteroskedasticity Robu
 No. Equations.:                     2   McElroy&#39;s R-squared:                 0.2762
 No. Observations:                 616   Judge&#39;s (OLS) R-squared:             0.1685
 Date:                Tue, Sep 24 2024   Berndt&#39;s R-squared:                  0.4504
-Time:                        09:24:34   Dhrymes&#39;s R-squared:                 0.1685
+Time:                        09:28:46   Dhrymes&#39;s R-squared:                 0.1685
                                         Cov. Estimator:                      robust
                                         Num. Constraints:                      None
                  Equation: hrearn, Dependent Variable: hrearn
@@ -2147,7 +2147,7 @@ <h4 id="Kernel-(HAC)">Kernel (HAC)<a class="headerlink" href="#Kernel-(HAC)" tit
 No. Equations.:                     2   McElroy&#39;s R-squared:                 0.2762
 No. Observations:                 616   Judge&#39;s (OLS) R-squared:             0.1685
 Date:                Tue, Sep 24 2024   Berndt&#39;s R-squared:                  0.4504
-Time:                        09:24:34   Dhrymes&#39;s R-squared:                 0.1685
+Time:                        09:28:47   Dhrymes&#39;s R-squared:                 0.1685
                                         Cov. Estimator:                      kernel
                                         Num. Constraints:                      None
                  Equation: hrearn, Dependent Variable: hrearn
@@ -2203,7 +2203,7 @@ <h4 id="Clustered-(Rogers)">Clustered (Rogers)<a class="headerlink" href="#Clust
 No. Equations.:                     2   McElroy&#39;s R-squared:                 0.2762
 No. Observations:                 616   Judge&#39;s (OLS) R-squared:             0.1685
 Date:                Tue, Sep 24 2024   Berndt&#39;s R-squared:                  0.4504
-Time:                        09:24:34   Dhrymes&#39;s R-squared:                 0.1685
+Time:                        09:28:47   Dhrymes&#39;s R-squared:                 0.1685
                                         Cov. Estimator:                   clustered
                                         Num. Constraints:                      None
                  Equation: hrearn, Dependent Variable: hrearn
@@ -2263,7 +2263,7 @@ <h2 id="Prespecified-Residual-Covariance-Estimators">Prespecified Residual Covar
 Estimator:                        GLS   Cov. Estimator:             unadjusted
 No. Observations:                  17   F-statistic:                    549.95
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000
-Time:                        09:24:34   Distribution:                  F(6,90)
+Time:                        09:28:47   Distribution:                  F(6,90)
 
                              Parameter Estimates
 ==============================================================================
@@ -2434,7 +2434,7 @@ <h3 id="Pooling-using-constraints">Pooling using constraints<a class="headerlink
 No. Equations.:                     9   McElroy&#39;s R-squared:                 0.9891
 No. Observations:                  17   Judge&#39;s (OLS) R-squared:             0.9777
 Date:                Tue, Sep 24 2024   Berndt&#39;s R-squared:                  0.9974
-Time:                        09:24:35   Dhrymes&#39;s R-squared:                 0.9777
+Time:                        09:28:47   Dhrymes&#39;s R-squared:                 0.9777
                                         Cov. Estimator:                      robust
                                         Num. Constraints:                        48
                    Equation: GF, Dependent Variable: lnGSP
@@ -2494,7 +2494,7 @@ <h2 id="Multivariate-OLS">Multivariate OLS<a class="headerlink" href="#Multivari
 No. Equations.:                     6   McElroy&#39;s R-squared:                 0.8776
 No. Observations:                 819   Judge&#39;s (OLS) R-squared:             0.6564
 Date:                Tue, Sep 24 2024   Berndt&#39;s R-squared:                  0.9773
-Time:                        09:24:35   Dhrymes&#39;s R-squared:                 0.6564
+Time:                        09:28:47   Dhrymes&#39;s R-squared:                 0.6564
                                         Cov. Estimator:                  unadjusted
                                         Num. Constraints:                      None
                    Equation: S1V1, Dependent Variable: S1V1
@@ -2560,7 +2560,7 @@ <h3 id="Using-GLS-with-common-regressors">Using GLS with common regressors<a cla
 No. Equations.:                     6   McElroy&#39;s R-squared:                 0.8776
 No. Observations:                 819   Judge&#39;s (OLS) R-squared:             0.6564
 Date:                Tue, Sep 24 2024   Berndt&#39;s R-squared:                  0.9773
-Time:                        09:24:35   Dhrymes&#39;s R-squared:                 0.6564
+Time:                        09:28:47   Dhrymes&#39;s R-squared:                 0.6564
                                         Cov. Estimator:                  unadjusted
                                         Num. Constraints:                      None
                    Equation: S1V1, Dependent Variable: S1V1
diff --git a/devel/system/examples/examples.ipynb b/devel/system/examples/examples.ipynb
index dc3e57c6b1..cfb2bb9705 100644
--- a/devel/system/examples/examples.ipynb
+++ b/devel/system/examples/examples.ipynb
@@ -37,10 +37,10 @@
    "execution_count": 1,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:31.413751Z",
-     "iopub.status.busy": "2024-09-24T09:24:31.413453Z",
-     "iopub.status.idle": "2024-09-24T09:24:33.323005Z",
-     "shell.execute_reply": "2024-09-24T09:24:33.322082Z"
+     "iopub.execute_input": "2024-09-24T09:28:43.293300Z",
+     "iopub.status.busy": "2024-09-24T09:28:43.292938Z",
+     "iopub.status.idle": "2024-09-24T09:28:45.642347Z",
+     "shell.execute_reply": "2024-09-24T09:28:45.641247Z"
     }
    },
    "outputs": [],
@@ -67,10 +67,10 @@
    "execution_count": 2,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:33.326679Z",
-     "iopub.status.busy": "2024-09-24T09:24:33.326203Z",
-     "iopub.status.idle": "2024-09-24T09:24:33.517146Z",
-     "shell.execute_reply": "2024-09-24T09:24:33.516236Z"
+     "iopub.execute_input": "2024-09-24T09:28:45.645366Z",
+     "iopub.status.busy": "2024-09-24T09:28:45.644997Z",
+     "iopub.status.idle": "2024-09-24T09:28:45.788196Z",
+     "shell.execute_reply": "2024-09-24T09:28:45.787445Z"
     }
    },
    "outputs": [],
@@ -116,10 +116,10 @@
    "execution_count": 3,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:33.521118Z",
-     "iopub.status.busy": "2024-09-24T09:24:33.520759Z",
-     "iopub.status.idle": "2024-09-24T09:24:33.534852Z",
-     "shell.execute_reply": "2024-09-24T09:24:33.533805Z"
+     "iopub.execute_input": "2024-09-24T09:28:45.792370Z",
+     "iopub.status.busy": "2024-09-24T09:28:45.791435Z",
+     "iopub.status.idle": "2024-09-24T09:28:45.802057Z",
+     "shell.execute_reply": "2024-09-24T09:28:45.801381Z"
     }
    },
    "outputs": [],
@@ -154,10 +154,10 @@
    "execution_count": 4,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:33.540143Z",
-     "iopub.status.busy": "2024-09-24T09:24:33.538924Z",
-     "iopub.status.idle": "2024-09-24T09:24:33.557238Z",
-     "shell.execute_reply": "2024-09-24T09:24:33.556315Z"
+     "iopub.execute_input": "2024-09-24T09:28:45.805575Z",
+     "iopub.status.busy": "2024-09-24T09:28:45.805315Z",
+     "iopub.status.idle": "2024-09-24T09:28:45.819366Z",
+     "shell.execute_reply": "2024-09-24T09:28:45.818622Z"
     }
    },
    "outputs": [],
@@ -188,10 +188,10 @@
    "execution_count": 5,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:33.560963Z",
-     "iopub.status.busy": "2024-09-24T09:24:33.560630Z",
-     "iopub.status.idle": "2024-09-24T09:24:33.644595Z",
-     "shell.execute_reply": "2024-09-24T09:24:33.643565Z"
+     "iopub.execute_input": "2024-09-24T09:28:45.823784Z",
+     "iopub.status.busy": "2024-09-24T09:28:45.822805Z",
+     "iopub.status.idle": "2024-09-24T09:28:45.885179Z",
+     "shell.execute_reply": "2024-09-24T09:28:45.884429Z"
     }
    },
    "outputs": [],
@@ -215,10 +215,10 @@
    "execution_count": 6,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:33.649311Z",
-     "iopub.status.busy": "2024-09-24T09:24:33.648945Z",
-     "iopub.status.idle": "2024-09-24T09:24:34.196565Z",
-     "shell.execute_reply": "2024-09-24T09:24:34.195663Z"
+     "iopub.execute_input": "2024-09-24T09:28:45.889647Z",
+     "iopub.status.busy": "2024-09-24T09:28:45.888645Z",
+     "iopub.status.idle": "2024-09-24T09:28:46.292714Z",
+     "shell.execute_reply": "2024-09-24T09:28:46.291998Z"
     }
    },
    "outputs": [
@@ -237,135 +237,135 @@
       "text/html": [
        "<style type=\"text/css\">\n",
        "</style>\n",
-       "<table id=\"T_ab4e0\">\n",
+       "<table id=\"T_21c25\">\n",
        "  <thead>\n",
        "    <tr>\n",
        "      <th class=\"blank level0\" >&nbsp;</th>\n",
-       "      <th id=\"T_ab4e0_level0_col0\" class=\"col_heading level0 col0\" >GF</th>\n",
-       "      <th id=\"T_ab4e0_level0_col1\" class=\"col_heading level0 col1\" >SW</th>\n",
-       "      <th id=\"T_ab4e0_level0_col2\" class=\"col_heading level0 col2\" >WC</th>\n",
-       "      <th id=\"T_ab4e0_level0_col3\" class=\"col_heading level0 col3\" >MT</th>\n",
-       "      <th id=\"T_ab4e0_level0_col4\" class=\"col_heading level0 col4\" >NE</th>\n",
-       "      <th id=\"T_ab4e0_level0_col5\" class=\"col_heading level0 col5\" >MA</th>\n",
-       "      <th id=\"T_ab4e0_level0_col6\" class=\"col_heading level0 col6\" >SO</th>\n",
-       "      <th id=\"T_ab4e0_level0_col7\" class=\"col_heading level0 col7\" >MW</th>\n",
-       "      <th id=\"T_ab4e0_level0_col8\" class=\"col_heading level0 col8\" >CN</th>\n",
+       "      <th id=\"T_21c25_level0_col0\" class=\"col_heading level0 col0\" >GF</th>\n",
+       "      <th id=\"T_21c25_level0_col1\" class=\"col_heading level0 col1\" >SW</th>\n",
+       "      <th id=\"T_21c25_level0_col2\" class=\"col_heading level0 col2\" >WC</th>\n",
+       "      <th id=\"T_21c25_level0_col3\" class=\"col_heading level0 col3\" >MT</th>\n",
+       "      <th id=\"T_21c25_level0_col4\" class=\"col_heading level0 col4\" >NE</th>\n",
+       "      <th id=\"T_21c25_level0_col5\" class=\"col_heading level0 col5\" >MA</th>\n",
+       "      <th id=\"T_21c25_level0_col6\" class=\"col_heading level0 col6\" >SO</th>\n",
+       "      <th id=\"T_21c25_level0_col7\" class=\"col_heading level0 col7\" >MW</th>\n",
+       "      <th id=\"T_21c25_level0_col8\" class=\"col_heading level0 col8\" >CN</th>\n",
        "    </tr>\n",
        "  </thead>\n",
        "  <tbody>\n",
        "    <tr>\n",
-       "      <th id=\"T_ab4e0_level0_row0\" class=\"row_heading level0 row0\" >GF</th>\n",
-       "      <td id=\"T_ab4e0_row0_col0\" class=\"data row0 col0\" >1.000</td>\n",
-       "      <td id=\"T_ab4e0_row0_col1\" class=\"data row0 col1\" >0.173</td>\n",
-       "      <td id=\"T_ab4e0_row0_col2\" class=\"data row0 col2\" >0.447</td>\n",
-       "      <td id=\"T_ab4e0_row0_col3\" class=\"data row0 col3\" >-0.547</td>\n",
-       "      <td id=\"T_ab4e0_row0_col4\" class=\"data row0 col4\" >0.525</td>\n",
-       "      <td id=\"T_ab4e0_row0_col5\" class=\"data row0 col5\" >0.425</td>\n",
-       "      <td id=\"T_ab4e0_row0_col6\" class=\"data row0 col6\" >0.763</td>\n",
-       "      <td id=\"T_ab4e0_row0_col7\" class=\"data row0 col7\" >0.167</td>\n",
-       "      <td id=\"T_ab4e0_row0_col8\" class=\"data row0 col8\" >0.325</td>\n",
+       "      <th id=\"T_21c25_level0_row0\" class=\"row_heading level0 row0\" >GF</th>\n",
+       "      <td id=\"T_21c25_row0_col0\" class=\"data row0 col0\" >1.000</td>\n",
+       "      <td id=\"T_21c25_row0_col1\" class=\"data row0 col1\" >0.173</td>\n",
+       "      <td id=\"T_21c25_row0_col2\" class=\"data row0 col2\" >0.447</td>\n",
+       "      <td id=\"T_21c25_row0_col3\" class=\"data row0 col3\" >-0.547</td>\n",
+       "      <td id=\"T_21c25_row0_col4\" class=\"data row0 col4\" >0.525</td>\n",
+       "      <td id=\"T_21c25_row0_col5\" class=\"data row0 col5\" >0.425</td>\n",
+       "      <td id=\"T_21c25_row0_col6\" class=\"data row0 col6\" >0.763</td>\n",
+       "      <td id=\"T_21c25_row0_col7\" class=\"data row0 col7\" >0.167</td>\n",
+       "      <td id=\"T_21c25_row0_col8\" class=\"data row0 col8\" >0.325</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th id=\"T_ab4e0_level0_row1\" class=\"row_heading level0 row1\" >SW</th>\n",
-       "      <td id=\"T_ab4e0_row1_col0\" class=\"data row1 col0\" >0.173</td>\n",
-       "      <td id=\"T_ab4e0_row1_col1\" class=\"data row1 col1\" >1.000</td>\n",
-       "      <td id=\"T_ab4e0_row1_col2\" class=\"data row1 col2\" >0.697</td>\n",
-       "      <td id=\"T_ab4e0_row1_col3\" class=\"data row1 col3\" >-0.290</td>\n",
-       "      <td id=\"T_ab4e0_row1_col4\" class=\"data row1 col4\" >0.489</td>\n",
-       "      <td id=\"T_ab4e0_row1_col5\" class=\"data row1 col5\" >0.132</td>\n",
-       "      <td id=\"T_ab4e0_row1_col6\" class=\"data row1 col6\" >0.314</td>\n",
-       "      <td id=\"T_ab4e0_row1_col7\" class=\"data row1 col7\" >0.565</td>\n",
-       "      <td id=\"T_ab4e0_row1_col8\" class=\"data row1 col8\" >0.119</td>\n",
+       "      <th id=\"T_21c25_level0_row1\" class=\"row_heading level0 row1\" >SW</th>\n",
+       "      <td id=\"T_21c25_row1_col0\" class=\"data row1 col0\" >0.173</td>\n",
+       "      <td id=\"T_21c25_row1_col1\" class=\"data row1 col1\" >1.000</td>\n",
+       "      <td id=\"T_21c25_row1_col2\" class=\"data row1 col2\" >0.697</td>\n",
+       "      <td id=\"T_21c25_row1_col3\" class=\"data row1 col3\" >-0.290</td>\n",
+       "      <td id=\"T_21c25_row1_col4\" class=\"data row1 col4\" >0.489</td>\n",
+       "      <td id=\"T_21c25_row1_col5\" class=\"data row1 col5\" >0.132</td>\n",
+       "      <td id=\"T_21c25_row1_col6\" class=\"data row1 col6\" >0.314</td>\n",
+       "      <td id=\"T_21c25_row1_col7\" class=\"data row1 col7\" >0.565</td>\n",
+       "      <td id=\"T_21c25_row1_col8\" class=\"data row1 col8\" >0.119</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th id=\"T_ab4e0_level0_row2\" class=\"row_heading level0 row2\" >WC</th>\n",
-       "      <td id=\"T_ab4e0_row2_col0\" class=\"data row2 col0\" >0.447</td>\n",
-       "      <td id=\"T_ab4e0_row2_col1\" class=\"data row2 col1\" >0.697</td>\n",
-       "      <td id=\"T_ab4e0_row2_col2\" class=\"data row2 col2\" >1.000</td>\n",
-       "      <td id=\"T_ab4e0_row2_col3\" class=\"data row2 col3\" >-0.537</td>\n",
-       "      <td id=\"T_ab4e0_row2_col4\" class=\"data row2 col4\" >0.343</td>\n",
-       "      <td id=\"T_ab4e0_row2_col5\" class=\"data row2 col5\" >0.130</td>\n",
-       "      <td id=\"T_ab4e0_row2_col6\" class=\"data row2 col6\" >0.505</td>\n",
-       "      <td id=\"T_ab4e0_row2_col7\" class=\"data row2 col7\" >0.574</td>\n",
-       "      <td id=\"T_ab4e0_row2_col8\" class=\"data row2 col8\" >0.037</td>\n",
+       "      <th id=\"T_21c25_level0_row2\" class=\"row_heading level0 row2\" >WC</th>\n",
+       "      <td id=\"T_21c25_row2_col0\" class=\"data row2 col0\" >0.447</td>\n",
+       "      <td id=\"T_21c25_row2_col1\" class=\"data row2 col1\" >0.697</td>\n",
+       "      <td id=\"T_21c25_row2_col2\" class=\"data row2 col2\" >1.000</td>\n",
+       "      <td id=\"T_21c25_row2_col3\" class=\"data row2 col3\" >-0.537</td>\n",
+       "      <td id=\"T_21c25_row2_col4\" class=\"data row2 col4\" >0.343</td>\n",
+       "      <td id=\"T_21c25_row2_col5\" class=\"data row2 col5\" >0.130</td>\n",
+       "      <td id=\"T_21c25_row2_col6\" class=\"data row2 col6\" >0.505</td>\n",
+       "      <td id=\"T_21c25_row2_col7\" class=\"data row2 col7\" >0.574</td>\n",
+       "      <td id=\"T_21c25_row2_col8\" class=\"data row2 col8\" >0.037</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th id=\"T_ab4e0_level0_row3\" class=\"row_heading level0 row3\" >MT</th>\n",
-       "      <td id=\"T_ab4e0_row3_col0\" class=\"data row3 col0\" >-0.547</td>\n",
-       "      <td id=\"T_ab4e0_row3_col1\" class=\"data row3 col1\" >-0.290</td>\n",
-       "      <td id=\"T_ab4e0_row3_col2\" class=\"data row3 col2\" >-0.537</td>\n",
-       "      <td id=\"T_ab4e0_row3_col3\" class=\"data row3 col3\" >1.000</td>\n",
-       "      <td id=\"T_ab4e0_row3_col4\" class=\"data row3 col4\" >-0.241</td>\n",
-       "      <td id=\"T_ab4e0_row3_col5\" class=\"data row3 col5\" >-0.322</td>\n",
-       "      <td id=\"T_ab4e0_row3_col6\" class=\"data row3 col6\" >-0.351</td>\n",
-       "      <td id=\"T_ab4e0_row3_col7\" class=\"data row3 col7\" >-0.058</td>\n",
-       "      <td id=\"T_ab4e0_row3_col8\" class=\"data row3 col8\" >0.091</td>\n",
+       "      <th id=\"T_21c25_level0_row3\" class=\"row_heading level0 row3\" >MT</th>\n",
+       "      <td id=\"T_21c25_row3_col0\" class=\"data row3 col0\" >-0.547</td>\n",
+       "      <td id=\"T_21c25_row3_col1\" class=\"data row3 col1\" >-0.290</td>\n",
+       "      <td id=\"T_21c25_row3_col2\" class=\"data row3 col2\" >-0.537</td>\n",
+       "      <td id=\"T_21c25_row3_col3\" class=\"data row3 col3\" >1.000</td>\n",
+       "      <td id=\"T_21c25_row3_col4\" class=\"data row3 col4\" >-0.241</td>\n",
+       "      <td id=\"T_21c25_row3_col5\" class=\"data row3 col5\" >-0.322</td>\n",
+       "      <td id=\"T_21c25_row3_col6\" class=\"data row3 col6\" >-0.351</td>\n",
+       "      <td id=\"T_21c25_row3_col7\" class=\"data row3 col7\" >-0.058</td>\n",
+       "      <td id=\"T_21c25_row3_col8\" class=\"data row3 col8\" >0.091</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th id=\"T_ab4e0_level0_row4\" class=\"row_heading level0 row4\" >NE</th>\n",
-       "      <td id=\"T_ab4e0_row4_col0\" class=\"data row4 col0\" >0.525</td>\n",
-       "      <td id=\"T_ab4e0_row4_col1\" class=\"data row4 col1\" >0.489</td>\n",
-       "      <td id=\"T_ab4e0_row4_col2\" class=\"data row4 col2\" >0.343</td>\n",
-       "      <td id=\"T_ab4e0_row4_col3\" class=\"data row4 col3\" >-0.241</td>\n",
-       "      <td id=\"T_ab4e0_row4_col4\" class=\"data row4 col4\" >1.000</td>\n",
-       "      <td id=\"T_ab4e0_row4_col5\" class=\"data row4 col5\" >0.259</td>\n",
-       "      <td id=\"T_ab4e0_row4_col6\" class=\"data row4 col6\" >0.783</td>\n",
-       "      <td id=\"T_ab4e0_row4_col7\" class=\"data row4 col7\" >0.269</td>\n",
-       "      <td id=\"T_ab4e0_row4_col8\" class=\"data row4 col8\" >0.200</td>\n",
+       "      <th id=\"T_21c25_level0_row4\" class=\"row_heading level0 row4\" >NE</th>\n",
+       "      <td id=\"T_21c25_row4_col0\" class=\"data row4 col0\" >0.525</td>\n",
+       "      <td id=\"T_21c25_row4_col1\" class=\"data row4 col1\" >0.489</td>\n",
+       "      <td id=\"T_21c25_row4_col2\" class=\"data row4 col2\" >0.343</td>\n",
+       "      <td id=\"T_21c25_row4_col3\" class=\"data row4 col3\" >-0.241</td>\n",
+       "      <td id=\"T_21c25_row4_col4\" class=\"data row4 col4\" >1.000</td>\n",
+       "      <td id=\"T_21c25_row4_col5\" class=\"data row4 col5\" >0.259</td>\n",
+       "      <td id=\"T_21c25_row4_col6\" class=\"data row4 col6\" >0.783</td>\n",
+       "      <td id=\"T_21c25_row4_col7\" class=\"data row4 col7\" >0.269</td>\n",
+       "      <td id=\"T_21c25_row4_col8\" class=\"data row4 col8\" >0.200</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th id=\"T_ab4e0_level0_row5\" class=\"row_heading level0 row5\" >MA</th>\n",
-       "      <td id=\"T_ab4e0_row5_col0\" class=\"data row5 col0\" >0.425</td>\n",
-       "      <td id=\"T_ab4e0_row5_col1\" class=\"data row5 col1\" >0.132</td>\n",
-       "      <td id=\"T_ab4e0_row5_col2\" class=\"data row5 col2\" >0.130</td>\n",
-       "      <td id=\"T_ab4e0_row5_col3\" class=\"data row5 col3\" >-0.322</td>\n",
-       "      <td id=\"T_ab4e0_row5_col4\" class=\"data row5 col4\" >0.259</td>\n",
-       "      <td id=\"T_ab4e0_row5_col5\" class=\"data row5 col5\" >1.000</td>\n",
-       "      <td id=\"T_ab4e0_row5_col6\" class=\"data row5 col6\" >0.388</td>\n",
-       "      <td id=\"T_ab4e0_row5_col7\" class=\"data row5 col7\" >-0.037</td>\n",
-       "      <td id=\"T_ab4e0_row5_col8\" class=\"data row5 col8\" >0.713</td>\n",
+       "      <th id=\"T_21c25_level0_row5\" class=\"row_heading level0 row5\" >MA</th>\n",
+       "      <td id=\"T_21c25_row5_col0\" class=\"data row5 col0\" >0.425</td>\n",
+       "      <td id=\"T_21c25_row5_col1\" class=\"data row5 col1\" >0.132</td>\n",
+       "      <td id=\"T_21c25_row5_col2\" class=\"data row5 col2\" >0.130</td>\n",
+       "      <td id=\"T_21c25_row5_col3\" class=\"data row5 col3\" >-0.322</td>\n",
+       "      <td id=\"T_21c25_row5_col4\" class=\"data row5 col4\" >0.259</td>\n",
+       "      <td id=\"T_21c25_row5_col5\" class=\"data row5 col5\" >1.000</td>\n",
+       "      <td id=\"T_21c25_row5_col6\" class=\"data row5 col6\" >0.388</td>\n",
+       "      <td id=\"T_21c25_row5_col7\" class=\"data row5 col7\" >-0.037</td>\n",
+       "      <td id=\"T_21c25_row5_col8\" class=\"data row5 col8\" >0.713</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th id=\"T_ab4e0_level0_row6\" class=\"row_heading level0 row6\" >SO</th>\n",
-       "      <td id=\"T_ab4e0_row6_col0\" class=\"data row6 col0\" >0.763</td>\n",
-       "      <td id=\"T_ab4e0_row6_col1\" class=\"data row6 col1\" >0.314</td>\n",
-       "      <td id=\"T_ab4e0_row6_col2\" class=\"data row6 col2\" >0.505</td>\n",
-       "      <td id=\"T_ab4e0_row6_col3\" class=\"data row6 col3\" >-0.351</td>\n",
-       "      <td id=\"T_ab4e0_row6_col4\" class=\"data row6 col4\" >0.783</td>\n",
-       "      <td id=\"T_ab4e0_row6_col5\" class=\"data row6 col5\" >0.388</td>\n",
-       "      <td id=\"T_ab4e0_row6_col6\" class=\"data row6 col6\" >1.000</td>\n",
-       "      <td id=\"T_ab4e0_row6_col7\" class=\"data row6 col7\" >0.366</td>\n",
-       "      <td id=\"T_ab4e0_row6_col8\" class=\"data row6 col8\" >0.350</td>\n",
+       "      <th id=\"T_21c25_level0_row6\" class=\"row_heading level0 row6\" >SO</th>\n",
+       "      <td id=\"T_21c25_row6_col0\" class=\"data row6 col0\" >0.763</td>\n",
+       "      <td id=\"T_21c25_row6_col1\" class=\"data row6 col1\" >0.314</td>\n",
+       "      <td id=\"T_21c25_row6_col2\" class=\"data row6 col2\" >0.505</td>\n",
+       "      <td id=\"T_21c25_row6_col3\" class=\"data row6 col3\" >-0.351</td>\n",
+       "      <td id=\"T_21c25_row6_col4\" class=\"data row6 col4\" >0.783</td>\n",
+       "      <td id=\"T_21c25_row6_col5\" class=\"data row6 col5\" >0.388</td>\n",
+       "      <td id=\"T_21c25_row6_col6\" class=\"data row6 col6\" >1.000</td>\n",
+       "      <td id=\"T_21c25_row6_col7\" class=\"data row6 col7\" >0.366</td>\n",
+       "      <td id=\"T_21c25_row6_col8\" class=\"data row6 col8\" >0.350</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th id=\"T_ab4e0_level0_row7\" class=\"row_heading level0 row7\" >MW</th>\n",
-       "      <td id=\"T_ab4e0_row7_col0\" class=\"data row7 col0\" >0.167</td>\n",
-       "      <td id=\"T_ab4e0_row7_col1\" class=\"data row7 col1\" >0.565</td>\n",
-       "      <td id=\"T_ab4e0_row7_col2\" class=\"data row7 col2\" >0.574</td>\n",
-       "      <td id=\"T_ab4e0_row7_col3\" class=\"data row7 col3\" >-0.058</td>\n",
-       "      <td id=\"T_ab4e0_row7_col4\" class=\"data row7 col4\" >0.269</td>\n",
-       "      <td id=\"T_ab4e0_row7_col5\" class=\"data row7 col5\" >-0.037</td>\n",
-       "      <td id=\"T_ab4e0_row7_col6\" class=\"data row7 col6\" >0.366</td>\n",
-       "      <td id=\"T_ab4e0_row7_col7\" class=\"data row7 col7\" >1.000</td>\n",
-       "      <td id=\"T_ab4e0_row7_col8\" class=\"data row7 col8\" >0.298</td>\n",
+       "      <th id=\"T_21c25_level0_row7\" class=\"row_heading level0 row7\" >MW</th>\n",
+       "      <td id=\"T_21c25_row7_col0\" class=\"data row7 col0\" >0.167</td>\n",
+       "      <td id=\"T_21c25_row7_col1\" class=\"data row7 col1\" >0.565</td>\n",
+       "      <td id=\"T_21c25_row7_col2\" class=\"data row7 col2\" >0.574</td>\n",
+       "      <td id=\"T_21c25_row7_col3\" class=\"data row7 col3\" >-0.058</td>\n",
+       "      <td id=\"T_21c25_row7_col4\" class=\"data row7 col4\" >0.269</td>\n",
+       "      <td id=\"T_21c25_row7_col5\" class=\"data row7 col5\" >-0.037</td>\n",
+       "      <td id=\"T_21c25_row7_col6\" class=\"data row7 col6\" >0.366</td>\n",
+       "      <td id=\"T_21c25_row7_col7\" class=\"data row7 col7\" >1.000</td>\n",
+       "      <td id=\"T_21c25_row7_col8\" class=\"data row7 col8\" >0.298</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th id=\"T_ab4e0_level0_row8\" class=\"row_heading level0 row8\" >CN</th>\n",
-       "      <td id=\"T_ab4e0_row8_col0\" class=\"data row8 col0\" >0.325</td>\n",
-       "      <td id=\"T_ab4e0_row8_col1\" class=\"data row8 col1\" >0.119</td>\n",
-       "      <td id=\"T_ab4e0_row8_col2\" class=\"data row8 col2\" >0.037</td>\n",
-       "      <td id=\"T_ab4e0_row8_col3\" class=\"data row8 col3\" >0.091</td>\n",
-       "      <td id=\"T_ab4e0_row8_col4\" class=\"data row8 col4\" >0.200</td>\n",
-       "      <td id=\"T_ab4e0_row8_col5\" class=\"data row8 col5\" >0.713</td>\n",
-       "      <td id=\"T_ab4e0_row8_col6\" class=\"data row8 col6\" >0.350</td>\n",
-       "      <td id=\"T_ab4e0_row8_col7\" class=\"data row8 col7\" >0.298</td>\n",
-       "      <td id=\"T_ab4e0_row8_col8\" class=\"data row8 col8\" >1.000</td>\n",
+       "      <th id=\"T_21c25_level0_row8\" class=\"row_heading level0 row8\" >CN</th>\n",
+       "      <td id=\"T_21c25_row8_col0\" class=\"data row8 col0\" >0.325</td>\n",
+       "      <td id=\"T_21c25_row8_col1\" class=\"data row8 col1\" >0.119</td>\n",
+       "      <td id=\"T_21c25_row8_col2\" class=\"data row8 col2\" >0.037</td>\n",
+       "      <td id=\"T_21c25_row8_col3\" class=\"data row8 col3\" >0.091</td>\n",
+       "      <td id=\"T_21c25_row8_col4\" class=\"data row8 col4\" >0.200</td>\n",
+       "      <td id=\"T_21c25_row8_col5\" class=\"data row8 col5\" >0.713</td>\n",
+       "      <td id=\"T_21c25_row8_col6\" class=\"data row8 col6\" >0.350</td>\n",
+       "      <td id=\"T_21c25_row8_col7\" class=\"data row8 col7\" >0.298</td>\n",
+       "      <td id=\"T_21c25_row8_col8\" class=\"data row8 col8\" >1.000</td>\n",
        "    </tr>\n",
        "  </tbody>\n",
        "</table>\n"
       ],
       "text/plain": [
-       "<pandas.io.formats.style.Styler at 0x7f66b057d060>"
+       "<pandas.io.formats.style.Styler at 0x7f31ee3c2ce0>"
       ]
      },
      "execution_count": 6,
@@ -400,10 +400,10 @@
    "execution_count": 7,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:34.200579Z",
-     "iopub.status.busy": "2024-09-24T09:24:34.200048Z",
-     "iopub.status.idle": "2024-09-24T09:24:34.208493Z",
-     "shell.execute_reply": "2024-09-24T09:24:34.207686Z"
+     "iopub.execute_input": "2024-09-24T09:28:46.309135Z",
+     "iopub.status.busy": "2024-09-24T09:28:46.307610Z",
+     "iopub.status.idle": "2024-09-24T09:28:46.319190Z",
+     "shell.execute_reply": "2024-09-24T09:28:46.318169Z"
     }
    },
    "outputs": [
@@ -433,10 +433,10 @@
    "execution_count": 8,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:34.212629Z",
-     "iopub.status.busy": "2024-09-24T09:24:34.212123Z",
-     "iopub.status.idle": "2024-09-24T09:24:34.298143Z",
-     "shell.execute_reply": "2024-09-24T09:24:34.297279Z"
+     "iopub.execute_input": "2024-09-24T09:28:46.322763Z",
+     "iopub.status.busy": "2024-09-24T09:28:46.322223Z",
+     "iopub.status.idle": "2024-09-24T09:28:46.378365Z",
+     "shell.execute_reply": "2024-09-24T09:28:46.377166Z"
     }
    },
    "outputs": [
@@ -450,7 +450,7 @@
       "No. Equations.:                     9   McElroy's R-squared:                 0.9988\n",
       "No. Observations:                  17   Judge's (OLS) R-squared:             0.9937\n",
       "Date:                Tue, Sep 24 2024   Berndt's R-squared:                  1.0000\n",
-      "Time:                        09:24:33   Dhrymes's R-squared:                 0.9937\n",
+      "Time:                        09:28:45   Dhrymes's R-squared:                 0.9937\n",
       "                                        Cov. Estimator:                  unadjusted\n",
       "                                        Num. Constraints:                      None\n",
       "                   Equation: GF, Dependent Variable: lnGSP                    \n",
@@ -496,10 +496,10 @@
    "execution_count": 9,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:34.301838Z",
-     "iopub.status.busy": "2024-09-24T09:24:34.301512Z",
-     "iopub.status.idle": "2024-09-24T09:24:34.318763Z",
-     "shell.execute_reply": "2024-09-24T09:24:34.317836Z"
+     "iopub.execute_input": "2024-09-24T09:28:46.381501Z",
+     "iopub.status.busy": "2024-09-24T09:28:46.381091Z",
+     "iopub.status.idle": "2024-09-24T09:28:46.392899Z",
+     "shell.execute_reply": "2024-09-24T09:28:46.391998Z"
     }
    },
    "outputs": [
@@ -514,7 +514,7 @@
       "Estimator:                        GLS   Cov. Estimator:             unadjusted\n",
       "No. Observations:                  17   F-statistic:                    2862.4\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000\n",
-      "Time:                        09:24:33   Distribution:                  chi2(6)\n",
+      "Time:                        09:28:45   Distribution:                  chi2(6)\n",
       "                                                                              \n",
       "                             Parameter Estimates                              \n",
       "==============================================================================\n",
@@ -551,10 +551,10 @@
    "execution_count": 10,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:34.322476Z",
-     "iopub.status.busy": "2024-09-24T09:24:34.322146Z",
-     "iopub.status.idle": "2024-09-24T09:24:34.341511Z",
-     "shell.execute_reply": "2024-09-24T09:24:34.340645Z"
+     "iopub.execute_input": "2024-09-24T09:28:46.396083Z",
+     "iopub.status.busy": "2024-09-24T09:28:46.395676Z",
+     "iopub.status.idle": "2024-09-24T09:28:46.409722Z",
+     "shell.execute_reply": "2024-09-24T09:28:46.409108Z"
     }
    },
    "outputs": [
@@ -563,115 +563,115 @@
       "text/html": [
        "<style type=\"text/css\">\n",
        "</style>\n",
-       "<table id=\"T_7385c\">\n",
+       "<table id=\"T_fac83\">\n",
        "  <thead>\n",
        "    <tr>\n",
        "      <th class=\"blank level0\" >&nbsp;</th>\n",
-       "      <th id=\"T_7385c_level0_col0\" class=\"col_heading level0 col0\" >Intercept</th>\n",
-       "      <th id=\"T_7385c_level0_col1\" class=\"col_heading level0 col1\" >lnPC</th>\n",
-       "      <th id=\"T_7385c_level0_col2\" class=\"col_heading level0 col2\" >lnHWY</th>\n",
-       "      <th id=\"T_7385c_level0_col3\" class=\"col_heading level0 col3\" >lnWATER</th>\n",
-       "      <th id=\"T_7385c_level0_col4\" class=\"col_heading level0 col4\" >lnUTIL</th>\n",
-       "      <th id=\"T_7385c_level0_col5\" class=\"col_heading level0 col5\" >lnEMP</th>\n",
-       "      <th id=\"T_7385c_level0_col6\" class=\"col_heading level0 col6\" >UNEMP</th>\n",
+       "      <th id=\"T_fac83_level0_col0\" class=\"col_heading level0 col0\" >Intercept</th>\n",
+       "      <th id=\"T_fac83_level0_col1\" class=\"col_heading level0 col1\" >lnPC</th>\n",
+       "      <th id=\"T_fac83_level0_col2\" class=\"col_heading level0 col2\" >lnHWY</th>\n",
+       "      <th id=\"T_fac83_level0_col3\" class=\"col_heading level0 col3\" >lnWATER</th>\n",
+       "      <th id=\"T_fac83_level0_col4\" class=\"col_heading level0 col4\" >lnUTIL</th>\n",
+       "      <th id=\"T_fac83_level0_col5\" class=\"col_heading level0 col5\" >lnEMP</th>\n",
+       "      <th id=\"T_fac83_level0_col6\" class=\"col_heading level0 col6\" >UNEMP</th>\n",
        "    </tr>\n",
        "  </thead>\n",
        "  <tbody>\n",
        "    <tr>\n",
-       "      <th id=\"T_7385c_level0_row0\" class=\"row_heading level0 row0\" >GF</th>\n",
-       "      <td id=\"T_7385c_row0_col0\" class=\"data row0 col0\" >12.310</td>\n",
-       "      <td id=\"T_7385c_row0_col1\" class=\"data row0 col1\" >-0.201</td>\n",
-       "      <td id=\"T_7385c_row0_col2\" class=\"data row0 col2\" >-1.886</td>\n",
-       "      <td id=\"T_7385c_row0_col3\" class=\"data row0 col3\" >0.178</td>\n",
-       "      <td id=\"T_7385c_row0_col4\" class=\"data row0 col4\" >1.190</td>\n",
-       "      <td id=\"T_7385c_row0_col5\" class=\"data row0 col5\" >0.953</td>\n",
-       "      <td id=\"T_7385c_row0_col6\" class=\"data row0 col6\" >-0.003</td>\n",
+       "      <th id=\"T_fac83_level0_row0\" class=\"row_heading level0 row0\" >GF</th>\n",
+       "      <td id=\"T_fac83_row0_col0\" class=\"data row0 col0\" >12.310</td>\n",
+       "      <td id=\"T_fac83_row0_col1\" class=\"data row0 col1\" >-0.201</td>\n",
+       "      <td id=\"T_fac83_row0_col2\" class=\"data row0 col2\" >-1.886</td>\n",
+       "      <td id=\"T_fac83_row0_col3\" class=\"data row0 col3\" >0.178</td>\n",
+       "      <td id=\"T_fac83_row0_col4\" class=\"data row0 col4\" >1.190</td>\n",
+       "      <td id=\"T_fac83_row0_col5\" class=\"data row0 col5\" >0.953</td>\n",
+       "      <td id=\"T_fac83_row0_col6\" class=\"data row0 col6\" >-0.003</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th id=\"T_7385c_level0_row1\" class=\"row_heading level0 row1\" >SW</th>\n",
-       "      <td id=\"T_7385c_row1_col0\" class=\"data row1 col0\" >4.083</td>\n",
-       "      <td id=\"T_7385c_row1_col1\" class=\"data row1 col1\" >0.077</td>\n",
-       "      <td id=\"T_7385c_row1_col2\" class=\"data row1 col2\" >-0.131</td>\n",
-       "      <td id=\"T_7385c_row1_col3\" class=\"data row1 col3\" >-0.136</td>\n",
-       "      <td id=\"T_7385c_row1_col4\" class=\"data row1 col4\" >0.522</td>\n",
-       "      <td id=\"T_7385c_row1_col5\" class=\"data row1 col5\" >0.539</td>\n",
-       "      <td id=\"T_7385c_row1_col6\" class=\"data row1 col6\" >-0.016</td>\n",
+       "      <th id=\"T_fac83_level0_row1\" class=\"row_heading level0 row1\" >SW</th>\n",
+       "      <td id=\"T_fac83_row1_col0\" class=\"data row1 col0\" >4.083</td>\n",
+       "      <td id=\"T_fac83_row1_col1\" class=\"data row1 col1\" >0.077</td>\n",
+       "      <td id=\"T_fac83_row1_col2\" class=\"data row1 col2\" >-0.131</td>\n",
+       "      <td id=\"T_fac83_row1_col3\" class=\"data row1 col3\" >-0.136</td>\n",
+       "      <td id=\"T_fac83_row1_col4\" class=\"data row1 col4\" >0.522</td>\n",
+       "      <td id=\"T_fac83_row1_col5\" class=\"data row1 col5\" >0.539</td>\n",
+       "      <td id=\"T_fac83_row1_col6\" class=\"data row1 col6\" >-0.016</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th id=\"T_7385c_level0_row2\" class=\"row_heading level0 row2\" >WC</th>\n",
-       "      <td id=\"T_7385c_row2_col0\" class=\"data row2 col0\" >1.960</td>\n",
-       "      <td id=\"T_7385c_row2_col1\" class=\"data row2 col1\" >0.170</td>\n",
-       "      <td id=\"T_7385c_row2_col2\" class=\"data row2 col2\" >0.132</td>\n",
-       "      <td id=\"T_7385c_row2_col3\" class=\"data row2 col3\" >-0.347</td>\n",
-       "      <td id=\"T_7385c_row2_col4\" class=\"data row2 col4\" >0.090</td>\n",
-       "      <td id=\"T_7385c_row2_col5\" class=\"data row2 col5\" >1.070</td>\n",
-       "      <td id=\"T_7385c_row2_col6\" class=\"data row2 col6\" >-0.006</td>\n",
+       "      <th id=\"T_fac83_level0_row2\" class=\"row_heading level0 row2\" >WC</th>\n",
+       "      <td id=\"T_fac83_row2_col0\" class=\"data row2 col0\" >1.960</td>\n",
+       "      <td id=\"T_fac83_row2_col1\" class=\"data row2 col1\" >0.170</td>\n",
+       "      <td id=\"T_fac83_row2_col2\" class=\"data row2 col2\" >0.132</td>\n",
+       "      <td id=\"T_fac83_row2_col3\" class=\"data row2 col3\" >-0.347</td>\n",
+       "      <td id=\"T_fac83_row2_col4\" class=\"data row2 col4\" >0.090</td>\n",
+       "      <td id=\"T_fac83_row2_col5\" class=\"data row2 col5\" >1.070</td>\n",
+       "      <td id=\"T_fac83_row2_col6\" class=\"data row2 col6\" >-0.006</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th id=\"T_7385c_level0_row3\" class=\"row_heading level0 row3\" >MT</th>\n",
-       "      <td id=\"T_7385c_row3_col0\" class=\"data row3 col0\" >3.463</td>\n",
-       "      <td id=\"T_7385c_row3_col1\" class=\"data row3 col1\" >-0.115</td>\n",
-       "      <td id=\"T_7385c_row3_col2\" class=\"data row3 col2\" >0.180</td>\n",
-       "      <td id=\"T_7385c_row3_col3\" class=\"data row3 col3\" >0.262</td>\n",
-       "      <td id=\"T_7385c_row3_col4\" class=\"data row3 col4\" >-0.330</td>\n",
-       "      <td id=\"T_7385c_row3_col5\" class=\"data row3 col5\" >1.079</td>\n",
-       "      <td id=\"T_7385c_row3_col6\" class=\"data row3 col6\" >-0.001</td>\n",
+       "      <th id=\"T_fac83_level0_row3\" class=\"row_heading level0 row3\" >MT</th>\n",
+       "      <td id=\"T_fac83_row3_col0\" class=\"data row3 col0\" >3.463</td>\n",
+       "      <td id=\"T_fac83_row3_col1\" class=\"data row3 col1\" >-0.115</td>\n",
+       "      <td id=\"T_fac83_row3_col2\" class=\"data row3 col2\" >0.180</td>\n",
+       "      <td id=\"T_fac83_row3_col3\" class=\"data row3 col3\" >0.262</td>\n",
+       "      <td id=\"T_fac83_row3_col4\" class=\"data row3 col4\" >-0.330</td>\n",
+       "      <td id=\"T_fac83_row3_col5\" class=\"data row3 col5\" >1.079</td>\n",
+       "      <td id=\"T_fac83_row3_col6\" class=\"data row3 col6\" >-0.001</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th id=\"T_7385c_level0_row4\" class=\"row_heading level0 row4\" >NE</th>\n",
-       "      <td id=\"T_7385c_row4_col0\" class=\"data row4 col0\" >-12.294</td>\n",
-       "      <td id=\"T_7385c_row4_col1\" class=\"data row4 col1\" >0.118</td>\n",
-       "      <td id=\"T_7385c_row4_col2\" class=\"data row4 col2\" >0.934</td>\n",
-       "      <td id=\"T_7385c_row4_col3\" class=\"data row4 col3\" >-0.557</td>\n",
-       "      <td id=\"T_7385c_row4_col4\" class=\"data row4 col4\" >-0.290</td>\n",
-       "      <td id=\"T_7385c_row4_col5\" class=\"data row4 col5\" >2.494</td>\n",
-       "      <td id=\"T_7385c_row4_col6\" class=\"data row4 col6\" >0.020</td>\n",
+       "      <th id=\"T_fac83_level0_row4\" class=\"row_heading level0 row4\" >NE</th>\n",
+       "      <td id=\"T_fac83_row4_col0\" class=\"data row4 col0\" >-12.294</td>\n",
+       "      <td id=\"T_fac83_row4_col1\" class=\"data row4 col1\" >0.118</td>\n",
+       "      <td id=\"T_fac83_row4_col2\" class=\"data row4 col2\" >0.934</td>\n",
+       "      <td id=\"T_fac83_row4_col3\" class=\"data row4 col3\" >-0.557</td>\n",
+       "      <td id=\"T_fac83_row4_col4\" class=\"data row4 col4\" >-0.290</td>\n",
+       "      <td id=\"T_fac83_row4_col5\" class=\"data row4 col5\" >2.494</td>\n",
+       "      <td id=\"T_fac83_row4_col6\" class=\"data row4 col6\" >0.020</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th id=\"T_7385c_level0_row5\" class=\"row_heading level0 row5\" >MA</th>\n",
-       "      <td id=\"T_7385c_row5_col0\" class=\"data row5 col0\" >-18.616</td>\n",
-       "      <td id=\"T_7385c_row5_col1\" class=\"data row5 col1\" >-0.311</td>\n",
-       "      <td id=\"T_7385c_row5_col2\" class=\"data row5 col2\" >3.060</td>\n",
-       "      <td id=\"T_7385c_row5_col3\" class=\"data row5 col3\" >-0.109</td>\n",
-       "      <td id=\"T_7385c_row5_col4\" class=\"data row5 col4\" >-1.659</td>\n",
-       "      <td id=\"T_7385c_row5_col5\" class=\"data row5 col5\" >2.186</td>\n",
-       "      <td id=\"T_7385c_row5_col6\" class=\"data row5 col6\" >0.018</td>\n",
+       "      <th id=\"T_fac83_level0_row5\" class=\"row_heading level0 row5\" >MA</th>\n",
+       "      <td id=\"T_fac83_row5_col0\" class=\"data row5 col0\" >-18.616</td>\n",
+       "      <td id=\"T_fac83_row5_col1\" class=\"data row5 col1\" >-0.311</td>\n",
+       "      <td id=\"T_fac83_row5_col2\" class=\"data row5 col2\" >3.060</td>\n",
+       "      <td id=\"T_fac83_row5_col3\" class=\"data row5 col3\" >-0.109</td>\n",
+       "      <td id=\"T_fac83_row5_col4\" class=\"data row5 col4\" >-1.659</td>\n",
+       "      <td id=\"T_fac83_row5_col5\" class=\"data row5 col5\" >2.186</td>\n",
+       "      <td id=\"T_fac83_row5_col6\" class=\"data row5 col6\" >0.018</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th id=\"T_7385c_level0_row6\" class=\"row_heading level0 row6\" >SO</th>\n",
-       "      <td id=\"T_7385c_row6_col0\" class=\"data row6 col0\" >3.162</td>\n",
-       "      <td id=\"T_7385c_row6_col1\" class=\"data row6 col1\" >-0.063</td>\n",
-       "      <td id=\"T_7385c_row6_col2\" class=\"data row6 col2\" >-0.641</td>\n",
-       "      <td id=\"T_7385c_row6_col3\" class=\"data row6 col3\" >-0.081</td>\n",
-       "      <td id=\"T_7385c_row6_col4\" class=\"data row6 col4\" >0.281</td>\n",
-       "      <td id=\"T_7385c_row6_col5\" class=\"data row6 col5\" >1.620</td>\n",
-       "      <td id=\"T_7385c_row6_col6\" class=\"data row6 col6\" >0.008</td>\n",
+       "      <th id=\"T_fac83_level0_row6\" class=\"row_heading level0 row6\" >SO</th>\n",
+       "      <td id=\"T_fac83_row6_col0\" class=\"data row6 col0\" >3.162</td>\n",
+       "      <td id=\"T_fac83_row6_col1\" class=\"data row6 col1\" >-0.063</td>\n",
+       "      <td id=\"T_fac83_row6_col2\" class=\"data row6 col2\" >-0.641</td>\n",
+       "      <td id=\"T_fac83_row6_col3\" class=\"data row6 col3\" >-0.081</td>\n",
+       "      <td id=\"T_fac83_row6_col4\" class=\"data row6 col4\" >0.281</td>\n",
+       "      <td id=\"T_fac83_row6_col5\" class=\"data row6 col5\" >1.620</td>\n",
+       "      <td id=\"T_fac83_row6_col6\" class=\"data row6 col6\" >0.008</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th id=\"T_7385c_level0_row7\" class=\"row_heading level0 row7\" >MW</th>\n",
-       "      <td id=\"T_7385c_row7_col0\" class=\"data row7 col0\" >-9.258</td>\n",
-       "      <td id=\"T_7385c_row7_col1\" class=\"data row7 col1\" >0.096</td>\n",
-       "      <td id=\"T_7385c_row7_col2\" class=\"data row7 col2\" >1.612</td>\n",
-       "      <td id=\"T_7385c_row7_col3\" class=\"data row7 col3\" >0.694</td>\n",
-       "      <td id=\"T_7385c_row7_col4\" class=\"data row7 col4\" >-0.340</td>\n",
-       "      <td id=\"T_7385c_row7_col5\" class=\"data row7 col5\" >-0.062</td>\n",
-       "      <td id=\"T_7385c_row7_col6\" class=\"data row7 col6\" >-0.031</td>\n",
+       "      <th id=\"T_fac83_level0_row7\" class=\"row_heading level0 row7\" >MW</th>\n",
+       "      <td id=\"T_fac83_row7_col0\" class=\"data row7 col0\" >-9.258</td>\n",
+       "      <td id=\"T_fac83_row7_col1\" class=\"data row7 col1\" >0.096</td>\n",
+       "      <td id=\"T_fac83_row7_col2\" class=\"data row7 col2\" >1.612</td>\n",
+       "      <td id=\"T_fac83_row7_col3\" class=\"data row7 col3\" >0.694</td>\n",
+       "      <td id=\"T_fac83_row7_col4\" class=\"data row7 col4\" >-0.340</td>\n",
+       "      <td id=\"T_fac83_row7_col5\" class=\"data row7 col5\" >-0.062</td>\n",
+       "      <td id=\"T_fac83_row7_col6\" class=\"data row7 col6\" >-0.031</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th id=\"T_7385c_level0_row8\" class=\"row_heading level0 row8\" >CN</th>\n",
-       "      <td id=\"T_7385c_row8_col0\" class=\"data row8 col0\" >-3.405</td>\n",
-       "      <td id=\"T_7385c_row8_col1\" class=\"data row8 col1\" >0.295</td>\n",
-       "      <td id=\"T_7385c_row8_col2\" class=\"data row8 col2\" >0.934</td>\n",
-       "      <td id=\"T_7385c_row8_col3\" class=\"data row8 col3\" >0.539</td>\n",
-       "      <td id=\"T_7385c_row8_col4\" class=\"data row8 col4\" >0.003</td>\n",
-       "      <td id=\"T_7385c_row8_col5\" class=\"data row8 col5\" >-0.321</td>\n",
-       "      <td id=\"T_7385c_row8_col6\" class=\"data row8 col6\" >-0.029</td>\n",
+       "      <th id=\"T_fac83_level0_row8\" class=\"row_heading level0 row8\" >CN</th>\n",
+       "      <td id=\"T_fac83_row8_col0\" class=\"data row8 col0\" >-3.405</td>\n",
+       "      <td id=\"T_fac83_row8_col1\" class=\"data row8 col1\" >0.295</td>\n",
+       "      <td id=\"T_fac83_row8_col2\" class=\"data row8 col2\" >0.934</td>\n",
+       "      <td id=\"T_fac83_row8_col3\" class=\"data row8 col3\" >0.539</td>\n",
+       "      <td id=\"T_fac83_row8_col4\" class=\"data row8 col4\" >0.003</td>\n",
+       "      <td id=\"T_fac83_row8_col5\" class=\"data row8 col5\" >-0.321</td>\n",
+       "      <td id=\"T_fac83_row8_col6\" class=\"data row8 col6\" >-0.029</td>\n",
        "    </tr>\n",
        "  </tbody>\n",
        "</table>\n"
       ],
       "text/plain": [
-       "<pandas.io.formats.style.Styler at 0x7f66af6edff0>"
+       "<pandas.io.formats.style.Styler at 0x7f31f0788580>"
       ]
      },
      "execution_count": 10,
@@ -701,10 +701,10 @@
    "execution_count": 11,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:34.345678Z",
-     "iopub.status.busy": "2024-09-24T09:24:34.345163Z",
-     "iopub.status.idle": "2024-09-24T09:24:34.352660Z",
-     "shell.execute_reply": "2024-09-24T09:24:34.350553Z"
+     "iopub.execute_input": "2024-09-24T09:28:46.413686Z",
+     "iopub.status.busy": "2024-09-24T09:28:46.413442Z",
+     "iopub.status.idle": "2024-09-24T09:28:46.425977Z",
+     "shell.execute_reply": "2024-09-24T09:28:46.420995Z"
     }
    },
    "outputs": [
@@ -734,10 +734,10 @@
    "execution_count": 12,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:34.356213Z",
-     "iopub.status.busy": "2024-09-24T09:24:34.355845Z",
-     "iopub.status.idle": "2024-09-24T09:24:34.393343Z",
-     "shell.execute_reply": "2024-09-24T09:24:34.392333Z"
+     "iopub.execute_input": "2024-09-24T09:28:46.429728Z",
+     "iopub.status.busy": "2024-09-24T09:28:46.429133Z",
+     "iopub.status.idle": "2024-09-24T09:28:46.484736Z",
+     "shell.execute_reply": "2024-09-24T09:28:46.484071Z"
     }
    },
    "outputs": [
@@ -746,125 +746,125 @@
       "text/html": [
        "<style type=\"text/css\">\n",
        "</style>\n",
-       "<table id=\"T_6288c\">\n",
+       "<table id=\"T_0345b\">\n",
        "  <thead>\n",
        "    <tr>\n",
        "      <th class=\"blank level0\" >&nbsp;</th>\n",
-       "      <th id=\"T_6288c_level0_col0\" class=\"col_heading level0 col0\" >Intercept</th>\n",
-       "      <th id=\"T_6288c_level0_col1\" class=\"col_heading level0 col1\" >lnPC</th>\n",
-       "      <th id=\"T_6288c_level0_col2\" class=\"col_heading level0 col2\" >lnHWY</th>\n",
-       "      <th id=\"T_6288c_level0_col3\" class=\"col_heading level0 col3\" >lnWATER</th>\n",
-       "      <th id=\"T_6288c_level0_col4\" class=\"col_heading level0 col4\" >lnUTIL</th>\n",
-       "      <th id=\"T_6288c_level0_col5\" class=\"col_heading level0 col5\" >lnEMP</th>\n",
-       "      <th id=\"T_6288c_level0_col6\" class=\"col_heading level0 col6\" >UNEMP</th>\n",
-       "      <th id=\"T_6288c_level0_col7\" class=\"col_heading level0 col7\" >R2</th>\n",
+       "      <th id=\"T_0345b_level0_col0\" class=\"col_heading level0 col0\" >Intercept</th>\n",
+       "      <th id=\"T_0345b_level0_col1\" class=\"col_heading level0 col1\" >lnPC</th>\n",
+       "      <th id=\"T_0345b_level0_col2\" class=\"col_heading level0 col2\" >lnHWY</th>\n",
+       "      <th id=\"T_0345b_level0_col3\" class=\"col_heading level0 col3\" >lnWATER</th>\n",
+       "      <th id=\"T_0345b_level0_col4\" class=\"col_heading level0 col4\" >lnUTIL</th>\n",
+       "      <th id=\"T_0345b_level0_col5\" class=\"col_heading level0 col5\" >lnEMP</th>\n",
+       "      <th id=\"T_0345b_level0_col6\" class=\"col_heading level0 col6\" >UNEMP</th>\n",
+       "      <th id=\"T_0345b_level0_col7\" class=\"col_heading level0 col7\" >R2</th>\n",
        "    </tr>\n",
        "  </thead>\n",
        "  <tbody>\n",
        "    <tr>\n",
-       "      <th id=\"T_6288c_level0_row0\" class=\"row_heading level0 row0\" >GF</th>\n",
-       "      <td id=\"T_6288c_row0_col0\" class=\"data row0 col0\" >11.567</td>\n",
-       "      <td id=\"T_6288c_row0_col1\" class=\"data row0 col1\" >0.002</td>\n",
-       "      <td id=\"T_6288c_row0_col2\" class=\"data row0 col2\" >-2.029</td>\n",
-       "      <td id=\"T_6288c_row0_col3\" class=\"data row0 col3\" >0.101</td>\n",
-       "      <td id=\"T_6288c_row0_col4\" class=\"data row0 col4\" >1.358</td>\n",
-       "      <td id=\"T_6288c_row0_col5\" class=\"data row0 col5\" >0.805</td>\n",
-       "      <td id=\"T_6288c_row0_col6\" class=\"data row0 col6\" >-0.007</td>\n",
-       "      <td id=\"T_6288c_row0_col7\" class=\"data row0 col7\" >0.997</td>\n",
+       "      <th id=\"T_0345b_level0_row0\" class=\"row_heading level0 row0\" >GF</th>\n",
+       "      <td id=\"T_0345b_row0_col0\" class=\"data row0 col0\" >11.567</td>\n",
+       "      <td id=\"T_0345b_row0_col1\" class=\"data row0 col1\" >0.002</td>\n",
+       "      <td id=\"T_0345b_row0_col2\" class=\"data row0 col2\" >-2.029</td>\n",
+       "      <td id=\"T_0345b_row0_col3\" class=\"data row0 col3\" >0.101</td>\n",
+       "      <td id=\"T_0345b_row0_col4\" class=\"data row0 col4\" >1.358</td>\n",
+       "      <td id=\"T_0345b_row0_col5\" class=\"data row0 col5\" >0.805</td>\n",
+       "      <td id=\"T_0345b_row0_col6\" class=\"data row0 col6\" >-0.007</td>\n",
+       "      <td id=\"T_0345b_row0_col7\" class=\"data row0 col7\" >0.997</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th id=\"T_6288c_level0_row1\" class=\"row_heading level0 row1\" >SW</th>\n",
-       "      <td id=\"T_6288c_row1_col0\" class=\"data row1 col0\" >3.028</td>\n",
-       "      <td id=\"T_6288c_row1_col1\" class=\"data row1 col1\" >0.164</td>\n",
-       "      <td id=\"T_6288c_row1_col2\" class=\"data row1 col2\" >-0.075</td>\n",
-       "      <td id=\"T_6288c_row1_col3\" class=\"data row1 col3\" >-0.169</td>\n",
-       "      <td id=\"T_6288c_row1_col4\" class=\"data row1 col4\" >0.637</td>\n",
-       "      <td id=\"T_6288c_row1_col5\" class=\"data row1 col5\" >0.362</td>\n",
-       "      <td id=\"T_6288c_row1_col6\" class=\"data row1 col6\" >-0.017</td>\n",
-       "      <td id=\"T_6288c_row1_col7\" class=\"data row1 col7\" >0.998</td>\n",
+       "      <th id=\"T_0345b_level0_row1\" class=\"row_heading level0 row1\" >SW</th>\n",
+       "      <td id=\"T_0345b_row1_col0\" class=\"data row1 col0\" >3.028</td>\n",
+       "      <td id=\"T_0345b_row1_col1\" class=\"data row1 col1\" >0.164</td>\n",
+       "      <td id=\"T_0345b_row1_col2\" class=\"data row1 col2\" >-0.075</td>\n",
+       "      <td id=\"T_0345b_row1_col3\" class=\"data row1 col3\" >-0.169</td>\n",
+       "      <td id=\"T_0345b_row1_col4\" class=\"data row1 col4\" >0.637</td>\n",
+       "      <td id=\"T_0345b_row1_col5\" class=\"data row1 col5\" >0.362</td>\n",
+       "      <td id=\"T_0345b_row1_col6\" class=\"data row1 col6\" >-0.017</td>\n",
+       "      <td id=\"T_0345b_row1_col7\" class=\"data row1 col7\" >0.998</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th id=\"T_6288c_level0_row2\" class=\"row_heading level0 row2\" >WC</th>\n",
-       "      <td id=\"T_6288c_row2_col0\" class=\"data row2 col0\" >3.590</td>\n",
-       "      <td id=\"T_6288c_row2_col1\" class=\"data row2 col1\" >0.295</td>\n",
-       "      <td id=\"T_6288c_row2_col2\" class=\"data row2 col2\" >0.174</td>\n",
-       "      <td id=\"T_6288c_row2_col3\" class=\"data row2 col3\" >-0.226</td>\n",
-       "      <td id=\"T_6288c_row2_col4\" class=\"data row2 col4\" >-0.214</td>\n",
-       "      <td id=\"T_6288c_row2_col5\" class=\"data row2 col5\" >0.917</td>\n",
-       "      <td id=\"T_6288c_row2_col6\" class=\"data row2 col6\" >-0.008</td>\n",
-       "      <td id=\"T_6288c_row2_col7\" class=\"data row2 col7\" >0.994</td>\n",
+       "      <th id=\"T_0345b_level0_row2\" class=\"row_heading level0 row2\" >WC</th>\n",
+       "      <td id=\"T_0345b_row2_col0\" class=\"data row2 col0\" >3.590</td>\n",
+       "      <td id=\"T_0345b_row2_col1\" class=\"data row2 col1\" >0.295</td>\n",
+       "      <td id=\"T_0345b_row2_col2\" class=\"data row2 col2\" >0.174</td>\n",
+       "      <td id=\"T_0345b_row2_col3\" class=\"data row2 col3\" >-0.226</td>\n",
+       "      <td id=\"T_0345b_row2_col4\" class=\"data row2 col4\" >-0.214</td>\n",
+       "      <td id=\"T_0345b_row2_col5\" class=\"data row2 col5\" >0.917</td>\n",
+       "      <td id=\"T_0345b_row2_col6\" class=\"data row2 col6\" >-0.008</td>\n",
+       "      <td id=\"T_0345b_row2_col7\" class=\"data row2 col7\" >0.994</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th id=\"T_6288c_level0_row3\" class=\"row_heading level0 row3\" >MT</th>\n",
-       "      <td id=\"T_6288c_row3_col0\" class=\"data row3 col0\" >6.378</td>\n",
-       "      <td id=\"T_6288c_row3_col1\" class=\"data row3 col1\" >-0.153</td>\n",
-       "      <td id=\"T_6288c_row3_col2\" class=\"data row3 col2\" >-0.123</td>\n",
-       "      <td id=\"T_6288c_row3_col3\" class=\"data row3 col3\" >0.306</td>\n",
-       "      <td id=\"T_6288c_row3_col4\" class=\"data row3 col4\" >-0.533</td>\n",
-       "      <td id=\"T_6288c_row3_col5\" class=\"data row3 col5\" >1.344</td>\n",
-       "      <td id=\"T_6288c_row3_col6\" class=\"data row3 col6\" >0.005</td>\n",
-       "      <td id=\"T_6288c_row3_col7\" class=\"data row3 col7\" >0.999</td>\n",
+       "      <th id=\"T_0345b_level0_row3\" class=\"row_heading level0 row3\" >MT</th>\n",
+       "      <td id=\"T_0345b_row3_col0\" class=\"data row3 col0\" >6.378</td>\n",
+       "      <td id=\"T_0345b_row3_col1\" class=\"data row3 col1\" >-0.153</td>\n",
+       "      <td id=\"T_0345b_row3_col2\" class=\"data row3 col2\" >-0.123</td>\n",
+       "      <td id=\"T_0345b_row3_col3\" class=\"data row3 col3\" >0.306</td>\n",
+       "      <td id=\"T_0345b_row3_col4\" class=\"data row3 col4\" >-0.533</td>\n",
+       "      <td id=\"T_0345b_row3_col5\" class=\"data row3 col5\" >1.344</td>\n",
+       "      <td id=\"T_0345b_row3_col6\" class=\"data row3 col6\" >0.005</td>\n",
+       "      <td id=\"T_0345b_row3_col7\" class=\"data row3 col7\" >0.999</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th id=\"T_6288c_level0_row4\" class=\"row_heading level0 row4\" >NE</th>\n",
-       "      <td id=\"T_6288c_row4_col0\" class=\"data row4 col0\" >-13.730</td>\n",
-       "      <td id=\"T_6288c_row4_col1\" class=\"data row4 col1\" >-0.020</td>\n",
-       "      <td id=\"T_6288c_row4_col2\" class=\"data row4 col2\" >0.662</td>\n",
-       "      <td id=\"T_6288c_row4_col3\" class=\"data row4 col3\" >-0.969</td>\n",
-       "      <td id=\"T_6288c_row4_col4\" class=\"data row4 col4\" >-0.107</td>\n",
-       "      <td id=\"T_6288c_row4_col5\" class=\"data row4 col5\" >3.380</td>\n",
-       "      <td id=\"T_6288c_row4_col6\" class=\"data row4 col6\" >0.034</td>\n",
-       "      <td id=\"T_6288c_row4_col7\" class=\"data row4 col7\" >0.985</td>\n",
+       "      <th id=\"T_0345b_level0_row4\" class=\"row_heading level0 row4\" >NE</th>\n",
+       "      <td id=\"T_0345b_row4_col0\" class=\"data row4 col0\" >-13.730</td>\n",
+       "      <td id=\"T_0345b_row4_col1\" class=\"data row4 col1\" >-0.020</td>\n",
+       "      <td id=\"T_0345b_row4_col2\" class=\"data row4 col2\" >0.662</td>\n",
+       "      <td id=\"T_0345b_row4_col3\" class=\"data row4 col3\" >-0.969</td>\n",
+       "      <td id=\"T_0345b_row4_col4\" class=\"data row4 col4\" >-0.107</td>\n",
+       "      <td id=\"T_0345b_row4_col5\" class=\"data row4 col5\" >3.380</td>\n",
+       "      <td id=\"T_0345b_row4_col6\" class=\"data row4 col6\" >0.034</td>\n",
+       "      <td id=\"T_0345b_row4_col7\" class=\"data row4 col7\" >0.985</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th id=\"T_6288c_level0_row5\" class=\"row_heading level0 row5\" >MA</th>\n",
-       "      <td id=\"T_6288c_row5_col0\" class=\"data row5 col0\" >-22.855</td>\n",
-       "      <td id=\"T_6288c_row5_col1\" class=\"data row5 col1\" >-0.378</td>\n",
-       "      <td id=\"T_6288c_row5_col2\" class=\"data row5 col2\" >3.348</td>\n",
-       "      <td id=\"T_6288c_row5_col3\" class=\"data row5 col3\" >-0.264</td>\n",
-       "      <td id=\"T_6288c_row5_col4\" class=\"data row5 col4\" >-1.778</td>\n",
-       "      <td id=\"T_6288c_row5_col5\" class=\"data row5 col5\" >2.673</td>\n",
-       "      <td id=\"T_6288c_row5_col6\" class=\"data row5 col6\" >0.026</td>\n",
-       "      <td id=\"T_6288c_row5_col7\" class=\"data row5 col7\" >0.986</td>\n",
+       "      <th id=\"T_0345b_level0_row5\" class=\"row_heading level0 row5\" >MA</th>\n",
+       "      <td id=\"T_0345b_row5_col0\" class=\"data row5 col0\" >-22.855</td>\n",
+       "      <td id=\"T_0345b_row5_col1\" class=\"data row5 col1\" >-0.378</td>\n",
+       "      <td id=\"T_0345b_row5_col2\" class=\"data row5 col2\" >3.348</td>\n",
+       "      <td id=\"T_0345b_row5_col3\" class=\"data row5 col3\" >-0.264</td>\n",
+       "      <td id=\"T_0345b_row5_col4\" class=\"data row5 col4\" >-1.778</td>\n",
+       "      <td id=\"T_0345b_row5_col5\" class=\"data row5 col5\" >2.673</td>\n",
+       "      <td id=\"T_0345b_row5_col6\" class=\"data row5 col6\" >0.026</td>\n",
+       "      <td id=\"T_0345b_row5_col7\" class=\"data row5 col7\" >0.986</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th id=\"T_6288c_level0_row6\" class=\"row_heading level0 row6\" >SO</th>\n",
-       "      <td id=\"T_6288c_row6_col0\" class=\"data row6 col0\" >3.927</td>\n",
-       "      <td id=\"T_6288c_row6_col1\" class=\"data row6 col1\" >0.043</td>\n",
-       "      <td id=\"T_6288c_row6_col2\" class=\"data row6 col2\" >-0.773</td>\n",
-       "      <td id=\"T_6288c_row6_col3\" class=\"data row6 col3\" >-0.035</td>\n",
-       "      <td id=\"T_6288c_row6_col4\" class=\"data row6 col4\" >0.140</td>\n",
-       "      <td id=\"T_6288c_row6_col5\" class=\"data row6 col5\" >1.665</td>\n",
-       "      <td id=\"T_6288c_row6_col6\" class=\"data row6 col6\" >0.008</td>\n",
-       "      <td id=\"T_6288c_row6_col7\" class=\"data row6 col7\" >0.994</td>\n",
+       "      <th id=\"T_0345b_level0_row6\" class=\"row_heading level0 row6\" >SO</th>\n",
+       "      <td id=\"T_0345b_row6_col0\" class=\"data row6 col0\" >3.927</td>\n",
+       "      <td id=\"T_0345b_row6_col1\" class=\"data row6 col1\" >0.043</td>\n",
+       "      <td id=\"T_0345b_row6_col2\" class=\"data row6 col2\" >-0.773</td>\n",
+       "      <td id=\"T_0345b_row6_col3\" class=\"data row6 col3\" >-0.035</td>\n",
+       "      <td id=\"T_0345b_row6_col4\" class=\"data row6 col4\" >0.140</td>\n",
+       "      <td id=\"T_0345b_row6_col5\" class=\"data row6 col5\" >1.665</td>\n",
+       "      <td id=\"T_0345b_row6_col6\" class=\"data row6 col6\" >0.008</td>\n",
+       "      <td id=\"T_0345b_row6_col7\" class=\"data row6 col7\" >0.994</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th id=\"T_6288c_level0_row7\" class=\"row_heading level0 row7\" >MW</th>\n",
-       "      <td id=\"T_6288c_row7_col0\" class=\"data row7 col0\" >-9.111</td>\n",
-       "      <td id=\"T_6288c_row7_col1\" class=\"data row7 col1\" >0.233</td>\n",
-       "      <td id=\"T_6288c_row7_col2\" class=\"data row7 col2\" >1.604</td>\n",
-       "      <td id=\"T_6288c_row7_col3\" class=\"data row7 col3\" >0.717</td>\n",
-       "      <td id=\"T_6288c_row7_col4\" class=\"data row7 col4\" >-0.356</td>\n",
-       "      <td id=\"T_6288c_row7_col5\" class=\"data row7 col5\" >-0.259</td>\n",
-       "      <td id=\"T_6288c_row7_col6\" class=\"data row7 col6\" >-0.034</td>\n",
-       "      <td id=\"T_6288c_row7_col7\" class=\"data row7 col7\" >0.989</td>\n",
+       "      <th id=\"T_0345b_level0_row7\" class=\"row_heading level0 row7\" >MW</th>\n",
+       "      <td id=\"T_0345b_row7_col0\" class=\"data row7 col0\" >-9.111</td>\n",
+       "      <td id=\"T_0345b_row7_col1\" class=\"data row7 col1\" >0.233</td>\n",
+       "      <td id=\"T_0345b_row7_col2\" class=\"data row7 col2\" >1.604</td>\n",
+       "      <td id=\"T_0345b_row7_col3\" class=\"data row7 col3\" >0.717</td>\n",
+       "      <td id=\"T_0345b_row7_col4\" class=\"data row7 col4\" >-0.356</td>\n",
+       "      <td id=\"T_0345b_row7_col5\" class=\"data row7 col5\" >-0.259</td>\n",
+       "      <td id=\"T_0345b_row7_col6\" class=\"data row7 col6\" >-0.034</td>\n",
+       "      <td id=\"T_0345b_row7_col7\" class=\"data row7 col7\" >0.989</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th id=\"T_6288c_level0_row8\" class=\"row_heading level0 row8\" >CN</th>\n",
-       "      <td id=\"T_6288c_row8_col0\" class=\"data row8 col0\" >-5.621</td>\n",
-       "      <td id=\"T_6288c_row8_col1\" class=\"data row8 col1\" >0.386</td>\n",
-       "      <td id=\"T_6288c_row8_col2\" class=\"data row8 col2\" >1.267</td>\n",
-       "      <td id=\"T_6288c_row8_col3\" class=\"data row8 col3\" >0.546</td>\n",
-       "      <td id=\"T_6288c_row8_col4\" class=\"data row8 col4\" >-0.108</td>\n",
-       "      <td id=\"T_6288c_row8_col5\" class=\"data row8 col5\" >-0.475</td>\n",
-       "      <td id=\"T_6288c_row8_col6\" class=\"data row8 col6\" >-0.031</td>\n",
-       "      <td id=\"T_6288c_row8_col7\" class=\"data row8 col7\" >0.995</td>\n",
+       "      <th id=\"T_0345b_level0_row8\" class=\"row_heading level0 row8\" >CN</th>\n",
+       "      <td id=\"T_0345b_row8_col0\" class=\"data row8 col0\" >-5.621</td>\n",
+       "      <td id=\"T_0345b_row8_col1\" class=\"data row8 col1\" >0.386</td>\n",
+       "      <td id=\"T_0345b_row8_col2\" class=\"data row8 col2\" >1.267</td>\n",
+       "      <td id=\"T_0345b_row8_col3\" class=\"data row8 col3\" >0.546</td>\n",
+       "      <td id=\"T_0345b_row8_col4\" class=\"data row8 col4\" >-0.108</td>\n",
+       "      <td id=\"T_0345b_row8_col5\" class=\"data row8 col5\" >-0.475</td>\n",
+       "      <td id=\"T_0345b_row8_col6\" class=\"data row8 col6\" >-0.031</td>\n",
+       "      <td id=\"T_0345b_row8_col7\" class=\"data row8 col7\" >0.995</td>\n",
        "    </tr>\n",
        "  </tbody>\n",
        "</table>\n"
       ],
       "text/plain": [
-       "<pandas.io.formats.style.Styler at 0x7f66ad06b370>"
+       "<pandas.io.formats.style.Styler at 0x7f31f078ab00>"
       ]
      },
      "execution_count": 12,
@@ -898,10 +898,10 @@
    "execution_count": 13,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:34.397204Z",
-     "iopub.status.busy": "2024-09-24T09:24:34.396824Z",
-     "iopub.status.idle": "2024-09-24T09:24:34.420551Z",
-     "shell.execute_reply": "2024-09-24T09:24:34.419687Z"
+     "iopub.execute_input": "2024-09-24T09:28:46.490505Z",
+     "iopub.status.busy": "2024-09-24T09:28:46.490228Z",
+     "iopub.status.idle": "2024-09-24T09:28:46.511595Z",
+     "shell.execute_reply": "2024-09-24T09:28:46.510987Z"
     }
    },
    "outputs": [
@@ -1045,10 +1045,10 @@
    "execution_count": 14,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:34.424656Z",
-     "iopub.status.busy": "2024-09-24T09:24:34.424311Z",
-     "iopub.status.idle": "2024-09-24T09:24:34.433397Z",
-     "shell.execute_reply": "2024-09-24T09:24:34.432471Z"
+     "iopub.execute_input": "2024-09-24T09:28:46.514552Z",
+     "iopub.status.busy": "2024-09-24T09:28:46.514308Z",
+     "iopub.status.idle": "2024-09-24T09:28:46.523728Z",
+     "shell.execute_reply": "2024-09-24T09:28:46.523171Z"
     }
    },
    "outputs": [
@@ -1085,10 +1085,10 @@
    "execution_count": 15,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:34.437089Z",
-     "iopub.status.busy": "2024-09-24T09:24:34.436743Z",
-     "iopub.status.idle": "2024-09-24T09:24:34.457635Z",
-     "shell.execute_reply": "2024-09-24T09:24:34.456744Z"
+     "iopub.execute_input": "2024-09-24T09:28:46.526661Z",
+     "iopub.status.busy": "2024-09-24T09:28:46.526434Z",
+     "iopub.status.idle": "2024-09-24T09:28:46.554520Z",
+     "shell.execute_reply": "2024-09-24T09:28:46.553891Z"
     }
    },
    "outputs": [
@@ -1162,10 +1162,10 @@
    "execution_count": 16,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:34.461921Z",
-     "iopub.status.busy": "2024-09-24T09:24:34.461542Z",
-     "iopub.status.idle": "2024-09-24T09:24:34.637461Z",
-     "shell.execute_reply": "2024-09-24T09:24:34.636590Z"
+     "iopub.execute_input": "2024-09-24T09:28:46.557018Z",
+     "iopub.status.busy": "2024-09-24T09:28:46.556755Z",
+     "iopub.status.idle": "2024-09-24T09:28:46.779325Z",
+     "shell.execute_reply": "2024-09-24T09:28:46.776574Z"
     }
    },
    "outputs": [
@@ -1179,7 +1179,7 @@
       "No. Equations.:                     2   McElroy's R-squared:                 0.2926\n",
       "No. Observations:                 616   Judge's (OLS) R-squared:             0.2087\n",
       "Date:                Tue, Sep 24 2024   Berndt's R-squared:                  0.4822\n",
-      "Time:                        09:24:34   Dhrymes's R-squared:                 0.2087\n",
+      "Time:                        09:28:46   Dhrymes's R-squared:                 0.2087\n",
       "                                        Cov. Estimator:                  unadjusted\n",
       "                                        Num. Constraints:                      None\n",
       "                 Equation: hrearn, Dependent Variable: hrearn                 \n",
@@ -1261,10 +1261,10 @@
    "execution_count": 17,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:34.641272Z",
-     "iopub.status.busy": "2024-09-24T09:24:34.640934Z",
-     "iopub.status.idle": "2024-09-24T09:24:34.680256Z",
-     "shell.execute_reply": "2024-09-24T09:24:34.679374Z"
+     "iopub.execute_input": "2024-09-24T09:28:46.785617Z",
+     "iopub.status.busy": "2024-09-24T09:28:46.785290Z",
+     "iopub.status.idle": "2024-09-24T09:28:46.847408Z",
+     "shell.execute_reply": "2024-09-24T09:28:46.843997Z"
     }
    },
    "outputs": [
@@ -1278,7 +1278,7 @@
       "No. Equations.:                     2   McElroy's R-squared:                 0.2926\n",
       "No. Observations:                 616   Judge's (OLS) R-squared:             0.2087\n",
       "Date:                Tue, Sep 24 2024   Berndt's R-squared:                  0.4822\n",
-      "Time:                        09:24:34   Dhrymes's R-squared:                 0.2087\n",
+      "Time:                        09:28:46   Dhrymes's R-squared:                 0.2087\n",
       "                                        Cov. Estimator:                  unadjusted\n",
       "                                        Num. Constraints:                      None\n",
       "                 Equation: hrearn, Dependent Variable: hrearn                 \n",
@@ -1338,10 +1338,10 @@
    "execution_count": 18,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:34.683957Z",
-     "iopub.status.busy": "2024-09-24T09:24:34.683539Z",
-     "iopub.status.idle": "2024-09-24T09:24:34.741833Z",
-     "shell.execute_reply": "2024-09-24T09:24:34.740842Z"
+     "iopub.execute_input": "2024-09-24T09:28:46.850733Z",
+     "iopub.status.busy": "2024-09-24T09:28:46.850467Z",
+     "iopub.status.idle": "2024-09-24T09:28:46.915747Z",
+     "shell.execute_reply": "2024-09-24T09:28:46.914904Z"
     }
    },
    "outputs": [
@@ -1355,7 +1355,7 @@
       "No. Equations.:                     2   McElroy's R-squared:                 0.2762\n",
       "No. Observations:                 616   Judge's (OLS) R-squared:             0.1685\n",
       "Date:                Tue, Sep 24 2024   Berndt's R-squared:                  0.4504\n",
-      "Time:                        09:24:34   Dhrymes's R-squared:                 0.1685\n",
+      "Time:                        09:28:46   Dhrymes's R-squared:                 0.1685\n",
       "                                        Cov. Estimator:                  unadjusted\n",
       "                                        Num. Constraints:                      None\n",
       "                 Equation: hrearn, Dependent Variable: hrearn                 \n",
@@ -1413,10 +1413,10 @@
    "execution_count": 19,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:34.745499Z",
-     "iopub.status.busy": "2024-09-24T09:24:34.745154Z",
-     "iopub.status.idle": "2024-09-24T09:24:34.780635Z",
-     "shell.execute_reply": "2024-09-24T09:24:34.779619Z"
+     "iopub.execute_input": "2024-09-24T09:28:46.921144Z",
+     "iopub.status.busy": "2024-09-24T09:28:46.920815Z",
+     "iopub.status.idle": "2024-09-24T09:28:46.971645Z",
+     "shell.execute_reply": "2024-09-24T09:28:46.970831Z"
     }
    },
    "outputs": [
@@ -1430,7 +1430,7 @@
       "No. Equations.:                     2   McElroy's R-squared:                 0.2749\n",
       "No. Observations:                 616   Judge's (OLS) R-squared:             0.1685\n",
       "Date:                Tue, Sep 24 2024   Berndt's R-squared:                  0.4532\n",
-      "Time:                        09:24:34   Dhrymes's R-squared:                 0.1685\n",
+      "Time:                        09:28:46   Dhrymes's R-squared:                 0.1685\n",
       "                                        Cov. Estimator:                  unadjusted\n",
       "                                        Num. Constraints:                      None\n",
       "                 Equation: hrearn, Dependent Variable: hrearn                 \n",
@@ -1480,10 +1480,10 @@
    "execution_count": 20,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:34.784722Z",
-     "iopub.status.busy": "2024-09-24T09:24:34.784375Z",
-     "iopub.status.idle": "2024-09-24T09:24:34.792775Z",
-     "shell.execute_reply": "2024-09-24T09:24:34.791959Z"
+     "iopub.execute_input": "2024-09-24T09:28:46.975973Z",
+     "iopub.status.busy": "2024-09-24T09:28:46.975046Z",
+     "iopub.status.idle": "2024-09-24T09:28:46.983067Z",
+     "shell.execute_reply": "2024-09-24T09:28:46.980833Z"
     }
    },
    "outputs": [
@@ -1525,10 +1525,10 @@
    "execution_count": 21,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:34.796915Z",
-     "iopub.status.busy": "2024-09-24T09:24:34.796489Z",
-     "iopub.status.idle": "2024-09-24T09:24:34.829852Z",
-     "shell.execute_reply": "2024-09-24T09:24:34.827955Z"
+     "iopub.execute_input": "2024-09-24T09:28:46.986750Z",
+     "iopub.status.busy": "2024-09-24T09:28:46.985882Z",
+     "iopub.status.idle": "2024-09-24T09:28:47.015481Z",
+     "shell.execute_reply": "2024-09-24T09:28:47.013634Z"
     }
    },
    "outputs": [
@@ -1542,7 +1542,7 @@
       "No. Equations.:                     2   McElroy's R-squared:                 0.2762\n",
       "No. Observations:                 616   Judge's (OLS) R-squared:             0.1685\n",
       "Date:                Tue, Sep 24 2024   Berndt's R-squared:                  0.4504\n",
-      "Time:                        09:24:34   Dhrymes's R-squared:                 0.1685\n",
+      "Time:                        09:28:46   Dhrymes's R-squared:                 0.1685\n",
       "                                        Cov. Estimator:                      robust\n",
       "                                        Num. Constraints:                      None\n",
       "                 Equation: hrearn, Dependent Variable: hrearn                 \n",
@@ -1596,10 +1596,10 @@
    "execution_count": 22,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:34.833560Z",
-     "iopub.status.busy": "2024-09-24T09:24:34.833211Z",
-     "iopub.status.idle": "2024-09-24T09:24:34.870141Z",
-     "shell.execute_reply": "2024-09-24T09:24:34.869323Z"
+     "iopub.execute_input": "2024-09-24T09:28:47.019582Z",
+     "iopub.status.busy": "2024-09-24T09:28:47.019257Z",
+     "iopub.status.idle": "2024-09-24T09:28:47.049433Z",
+     "shell.execute_reply": "2024-09-24T09:28:47.048607Z"
     }
    },
    "outputs": [
@@ -1613,7 +1613,7 @@
       "No. Equations.:                     2   McElroy's R-squared:                 0.2762\n",
       "No. Observations:                 616   Judge's (OLS) R-squared:             0.1685\n",
       "Date:                Tue, Sep 24 2024   Berndt's R-squared:                  0.4504\n",
-      "Time:                        09:24:34   Dhrymes's R-squared:                 0.1685\n",
+      "Time:                        09:28:47   Dhrymes's R-squared:                 0.1685\n",
       "                                        Cov. Estimator:                      kernel\n",
       "                                        Num. Constraints:                      None\n",
       "                 Equation: hrearn, Dependent Variable: hrearn                 \n",
@@ -1642,7 +1642,14 @@
       "==============================================================================\n",
       "\n",
       "Covariance Estimator:\n",
-      "Kernel (HAC) Covariance (Debiased: False, GLS: True, Kernel: parzen)\n"
+      "Kernel (HAC) Covariance (Debiased: False, GLS: True, Kernel: parzen)"
+     ]
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "\n"
      ]
     }
    ],
@@ -1665,10 +1672,10 @@
    "execution_count": 23,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:34.873998Z",
-     "iopub.status.busy": "2024-09-24T09:24:34.873657Z",
-     "iopub.status.idle": "2024-09-24T09:24:34.909858Z",
-     "shell.execute_reply": "2024-09-24T09:24:34.909009Z"
+     "iopub.execute_input": "2024-09-24T09:28:47.052584Z",
+     "iopub.status.busy": "2024-09-24T09:28:47.052274Z",
+     "iopub.status.idle": "2024-09-24T09:28:47.084602Z",
+     "shell.execute_reply": "2024-09-24T09:28:47.083850Z"
     }
    },
    "outputs": [
@@ -1682,7 +1689,7 @@
       "No. Equations.:                     2   McElroy's R-squared:                 0.2762\n",
       "No. Observations:                 616   Judge's (OLS) R-squared:             0.1685\n",
       "Date:                Tue, Sep 24 2024   Berndt's R-squared:                  0.4504\n",
-      "Time:                        09:24:34   Dhrymes's R-squared:                 0.1685\n",
+      "Time:                        09:28:47   Dhrymes's R-squared:                 0.1685\n",
       "                                        Cov. Estimator:                   clustered\n",
       "                                        Num. Constraints:                      None\n",
       "                 Equation: hrearn, Dependent Variable: hrearn                 \n",
@@ -1741,10 +1748,10 @@
    "execution_count": 24,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:34.913778Z",
-     "iopub.status.busy": "2024-09-24T09:24:34.913446Z",
-     "iopub.status.idle": "2024-09-24T09:24:35.015921Z",
-     "shell.execute_reply": "2024-09-24T09:24:35.014831Z"
+     "iopub.execute_input": "2024-09-24T09:28:47.087936Z",
+     "iopub.status.busy": "2024-09-24T09:28:47.087663Z",
+     "iopub.status.idle": "2024-09-24T09:28:47.182610Z",
+     "shell.execute_reply": "2024-09-24T09:28:47.181998Z"
     }
    },
    "outputs": [
@@ -1759,7 +1766,7 @@
       "Estimator:                        GLS   Cov. Estimator:             unadjusted\n",
       "No. Observations:                  17   F-statistic:                    549.95\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000\n",
-      "Time:                        09:24:34   Distribution:                  F(6,90)\n",
+      "Time:                        09:28:47   Distribution:                  F(6,90)\n",
       "                                                                              \n",
       "                             Parameter Estimates                              \n",
       "==============================================================================\n",
@@ -1817,10 +1824,10 @@
    "execution_count": 25,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:35.022338Z",
-     "iopub.status.busy": "2024-09-24T09:24:35.021877Z",
-     "iopub.status.idle": "2024-09-24T09:24:35.036199Z",
-     "shell.execute_reply": "2024-09-24T09:24:35.033231Z"
+     "iopub.execute_input": "2024-09-24T09:28:47.197975Z",
+     "iopub.status.busy": "2024-09-24T09:28:47.197407Z",
+     "iopub.status.idle": "2024-09-24T09:28:47.211690Z",
+     "shell.execute_reply": "2024-09-24T09:28:47.210797Z"
     }
    },
    "outputs": [
@@ -1870,10 +1877,10 @@
    "execution_count": 26,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:35.039281Z",
-     "iopub.status.busy": "2024-09-24T09:24:35.038933Z",
-     "iopub.status.idle": "2024-09-24T09:24:35.068679Z",
-     "shell.execute_reply": "2024-09-24T09:24:35.067965Z"
+     "iopub.execute_input": "2024-09-24T09:28:47.216002Z",
+     "iopub.status.busy": "2024-09-24T09:28:47.215424Z",
+     "iopub.status.idle": "2024-09-24T09:28:47.240628Z",
+     "shell.execute_reply": "2024-09-24T09:28:47.239993Z"
     }
    },
    "outputs": [
@@ -1929,10 +1936,10 @@
    "execution_count": 27,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:35.079851Z",
-     "iopub.status.busy": "2024-09-24T09:24:35.079461Z",
-     "iopub.status.idle": "2024-09-24T09:24:35.145633Z",
-     "shell.execute_reply": "2024-09-24T09:24:35.144740Z"
+     "iopub.execute_input": "2024-09-24T09:28:47.243498Z",
+     "iopub.status.busy": "2024-09-24T09:28:47.243235Z",
+     "iopub.status.idle": "2024-09-24T09:28:47.267579Z",
+     "shell.execute_reply": "2024-09-24T09:28:47.267029Z"
     }
    },
    "outputs": [
@@ -1984,10 +1991,10 @@
    "execution_count": 28,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:35.148437Z",
-     "iopub.status.busy": "2024-09-24T09:24:35.148139Z",
-     "iopub.status.idle": "2024-09-24T09:24:35.385481Z",
-     "shell.execute_reply": "2024-09-24T09:24:35.383820Z"
+     "iopub.execute_input": "2024-09-24T09:28:47.270810Z",
+     "iopub.status.busy": "2024-09-24T09:28:47.270552Z",
+     "iopub.status.idle": "2024-09-24T09:28:47.397645Z",
+     "shell.execute_reply": "2024-09-24T09:28:47.396992Z"
     }
    },
    "outputs": [
@@ -2001,7 +2008,7 @@
       "No. Equations.:                     9   McElroy's R-squared:                 0.9891\n",
       "No. Observations:                  17   Judge's (OLS) R-squared:             0.9777\n",
       "Date:                Tue, Sep 24 2024   Berndt's R-squared:                  0.9974\n",
-      "Time:                        09:24:35   Dhrymes's R-squared:                 0.9777\n",
+      "Time:                        09:28:47   Dhrymes's R-squared:                 0.9777\n",
       "                                        Cov. Estimator:                      robust\n",
       "                                        Num. Constraints:                        48\n",
       "                   Equation: GF, Dependent Variable: lnGSP                    \n",
@@ -2067,10 +2074,10 @@
    "execution_count": 29,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:35.388657Z",
-     "iopub.status.busy": "2024-09-24T09:24:35.388373Z",
-     "iopub.status.idle": "2024-09-24T09:24:35.543264Z",
-     "shell.execute_reply": "2024-09-24T09:24:35.540465Z"
+     "iopub.execute_input": "2024-09-24T09:28:47.401265Z",
+     "iopub.status.busy": "2024-09-24T09:28:47.401005Z",
+     "iopub.status.idle": "2024-09-24T09:28:47.519569Z",
+     "shell.execute_reply": "2024-09-24T09:28:47.518789Z"
     }
    },
    "outputs": [
@@ -2084,7 +2091,7 @@
       "No. Equations.:                     6   McElroy's R-squared:                 0.8776\n",
       "No. Observations:                 819   Judge's (OLS) R-squared:             0.6564\n",
       "Date:                Tue, Sep 24 2024   Berndt's R-squared:                  0.9773\n",
-      "Time:                        09:24:35   Dhrymes's R-squared:                 0.6564\n",
+      "Time:                        09:28:47   Dhrymes's R-squared:                 0.6564\n",
       "                                        Cov. Estimator:                  unadjusted\n",
       "                                        Num. Constraints:                      None\n",
       "                   Equation: S1V1, Dependent Variable: S1V1                   \n",
@@ -2157,10 +2164,10 @@
    "execution_count": 30,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:35.549419Z",
-     "iopub.status.busy": "2024-09-24T09:24:35.549162Z",
-     "iopub.status.idle": "2024-09-24T09:24:35.626914Z",
-     "shell.execute_reply": "2024-09-24T09:24:35.626207Z"
+     "iopub.execute_input": "2024-09-24T09:28:47.522947Z",
+     "iopub.status.busy": "2024-09-24T09:28:47.522455Z",
+     "iopub.status.idle": "2024-09-24T09:28:47.565648Z",
+     "shell.execute_reply": "2024-09-24T09:28:47.564846Z"
     }
    },
    "outputs": [
@@ -2174,7 +2181,7 @@
       "No. Equations.:                     6   McElroy's R-squared:                 0.8776\n",
       "No. Observations:                 819   Judge's (OLS) R-squared:             0.6564\n",
       "Date:                Tue, Sep 24 2024   Berndt's R-squared:                  0.9773\n",
-      "Time:                        09:24:35   Dhrymes's R-squared:                 0.6564\n",
+      "Time:                        09:28:47   Dhrymes's R-squared:                 0.6564\n",
       "                                        Cov. Estimator:                  unadjusted\n",
       "                                        Num. Constraints:                      None\n",
       "                   Equation: S1V1, Dependent Variable: S1V1                   \n",
diff --git a/devel/system/examples/formulas.html b/devel/system/examples/formulas.html
index 71afb19f44..ff2c0ea88b 100644
--- a/devel/system/examples/formulas.html
+++ b/devel/system/examples/formulas.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Using formulas to specify models - linearmodels v6.1 (+13)</title>
+        <title>Using formulas to specify models - linearmodels v6.1 (+15)</title>
       
     
 
@@ -94,7 +94,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -104,7 +104,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -191,10 +191,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
@@ -802,7 +802,7 @@ <h2 id="Dictionary">Dictionary<a class="headerlink" href="#Dictionary" title="Li
 No. Equations.:                     2   McElroy&#39;s R-squared:                 0.2197
 No. Observations:                 616   Judge&#39;s (OLS) R-squared:             0.1873
 Date:                Tue, Sep 24 2024   Berndt&#39;s R-squared:                  0.3775
-Time:                        09:24:41   Dhrymes&#39;s R-squared:                 0.6950
+Time:                        09:28:53   Dhrymes&#39;s R-squared:                 0.6950
                                         Cov. Estimator:                  unadjusted
                                         Num. Constraints:                      None
                 Equation: benefits, Dependent Variable: hrbens
@@ -860,7 +860,7 @@ <h2 id="Curly-Braces">Curly Braces<a class="headerlink" href="#Curly-Braces" tit
 No. Equations.:                     2   McElroy&#39;s R-squared:                 0.2197
 No. Observations:                 616   Judge&#39;s (OLS) R-squared:             0.1873
 Date:                Tue, Sep 24 2024   Berndt&#39;s R-squared:                  0.3775
-Time:                        09:24:41   Dhrymes&#39;s R-squared:                 0.6950
+Time:                        09:28:53   Dhrymes&#39;s R-squared:                 0.6950
                                         Cov. Estimator:                  unadjusted
                                         Num. Constraints:                      None
                  Equation: hrbens, Dependent Variable: hrbens
@@ -950,35 +950,35 @@ <h3 id="Estimation-Weights">Estimation Weights<a class="headerlink" href="#Estim
 <div class="highlight"><pre>
                            System GLS Estimation Summary
 ===================================================================================
-Estimator:                        GLS   Overall R-squared:                   0.7266
-No. Equations.:                     2   McElroy&#39;s R-squared:                 0.2194
-No. Observations:                 616   Judge&#39;s (OLS) R-squared:             0.1732
-Date:                Tue, Sep 24 2024   Berndt&#39;s R-squared:                  0.2575
-Time:                        09:24:41   Dhrymes&#39;s R-squared:                 0.7266
+Estimator:                        GLS   Overall R-squared:                   0.7242
+No. Equations.:                     2   McElroy&#39;s R-squared:                 0.2136
+No. Observations:                 616   Judge&#39;s (OLS) R-squared:             0.1411
+Date:                Tue, Sep 24 2024   Berndt&#39;s R-squared:                  0.1834
+Time:                        09:28:53   Dhrymes&#39;s R-squared:                 0.7243
                                         Cov. Estimator:                      robust
                                         Num. Constraints:                      None
                 Equation: benefits, Dependent Variable: hrbens
 ==============================================================================
             Parameter  Std. Err.     T-stat    P-value    Lower CI    Upper CI
 ------------------------------------------------------------------------------
-educ           0.0407     0.0047     8.7024     0.0000      0.0315      0.0499
-exper          0.0254     0.0060     4.1985     0.0000      0.0135      0.0372
-expersq       -0.0003     0.0001    -2.3756     0.0175     -0.0006   -5.89e-05
-union          0.4078     0.0497     8.2104     0.0000      0.3105      0.5052
-south         -0.1924     0.0540    -3.5645     0.0004     -0.2982     -0.0866
-nrtheast      -0.1834     0.0670    -2.7354     0.0062     -0.3147     -0.0520
-nrthcen       -0.1713     0.0582    -2.9415     0.0033     -0.2854     -0.0572
-male           0.2400     0.0462     5.1905     0.0000      0.1494      0.3307
+educ           0.0331     0.0046     7.1660     0.0000      0.0241      0.0422
+exper          0.0352     0.0053     6.5899     0.0000      0.0247      0.0457
+expersq       -0.0006     0.0001    -5.2702     0.0000     -0.0009     -0.0004
+union          0.3703     0.0496     7.4677     0.0000      0.2731      0.4674
+south         -0.1909     0.0538    -3.5463     0.0004     -0.2964     -0.0854
+nrtheast      -0.1529     0.0652    -2.3438     0.0191     -0.2807     -0.0250
+nrthcen       -0.1117     0.0574    -1.9475     0.0515     -0.2242      0.0007
+male           0.2625     0.0463     5.6651     0.0000      0.1717      0.3533
                 Equation: earnings, Dependent Variable: hrearn
 ==============================================================================
             Parameter  Std. Err.     T-stat    P-value    Lower CI    Upper CI
 ------------------------------------------------------------------------------
-educ           0.3736     0.0936     3.9896     0.0001      0.1901      0.5572
-exper         -0.1532     0.2096    -0.7309     0.4649     -0.5639      0.2576
-expersq        0.0061     0.0055     1.1221     0.2618     -0.0046      0.0168
-nrtheast      -1.1416     0.5478    -2.0839     0.0372     -2.2154     -0.0679
-married        0.4509     0.2955     1.5261     0.1270     -0.1282      1.0300
-male           2.3767     0.2408     9.8684     0.0000      1.9047      2.8487
+educ           0.4434     0.1118     3.9650     0.0001      0.2242      0.6625
+exper         -0.2994     0.2570    -1.1647     0.2441     -0.8032      0.2044
+expersq        0.0097     0.0068     1.4231     0.1547     -0.0036      0.0230
+nrtheast      -0.9905     0.5735    -1.7271     0.0842     -2.1146      0.1336
+married        0.7634     0.4524     1.6875     0.0915     -0.1233      1.6500
+male           1.9960     0.2404     8.3036     0.0000      1.5248      2.4671
 ==============================================================================
 
 Covariance Estimator:
diff --git a/devel/system/examples/formulas.ipynb b/devel/system/examples/formulas.ipynb
index 94a4192459..726c5ba6f1 100644
--- a/devel/system/examples/formulas.ipynb
+++ b/devel/system/examples/formulas.ipynb
@@ -20,10 +20,10 @@
    "execution_count": 1,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:39.967690Z",
-     "iopub.status.busy": "2024-09-24T09:24:39.967337Z",
-     "iopub.status.idle": "2024-09-24T09:24:41.257668Z",
-     "shell.execute_reply": "2024-09-24T09:24:41.256943Z"
+     "iopub.execute_input": "2024-09-24T09:28:51.833442Z",
+     "iopub.status.busy": "2024-09-24T09:28:51.833199Z",
+     "iopub.status.idle": "2024-09-24T09:28:52.971350Z",
+     "shell.execute_reply": "2024-09-24T09:28:52.970577Z"
     }
    },
    "outputs": [],
@@ -49,10 +49,10 @@
    "execution_count": 2,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:41.264088Z",
-     "iopub.status.busy": "2024-09-24T09:24:41.262791Z",
-     "iopub.status.idle": "2024-09-24T09:24:41.275400Z",
-     "shell.execute_reply": "2024-09-24T09:24:41.274708Z"
+     "iopub.execute_input": "2024-09-24T09:28:52.975177Z",
+     "iopub.status.busy": "2024-09-24T09:28:52.973944Z",
+     "iopub.status.idle": "2024-09-24T09:28:52.978867Z",
+     "shell.execute_reply": "2024-09-24T09:28:52.978298Z"
     }
    },
    "outputs": [],
@@ -71,10 +71,10 @@
    "execution_count": 3,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:41.277882Z",
-     "iopub.status.busy": "2024-09-24T09:24:41.277647Z",
-     "iopub.status.idle": "2024-09-24T09:24:41.335017Z",
-     "shell.execute_reply": "2024-09-24T09:24:41.334337Z"
+     "iopub.execute_input": "2024-09-24T09:28:52.981353Z",
+     "iopub.status.busy": "2024-09-24T09:28:52.981127Z",
+     "iopub.status.idle": "2024-09-24T09:28:53.076672Z",
+     "shell.execute_reply": "2024-09-24T09:28:53.076111Z"
     }
    },
    "outputs": [
@@ -88,7 +88,7 @@
       "No. Equations.:                     2   McElroy's R-squared:                 0.2197\n",
       "No. Observations:                 616   Judge's (OLS) R-squared:             0.1873\n",
       "Date:                Tue, Sep 24 2024   Berndt's R-squared:                  0.3775\n",
-      "Time:                        09:24:41   Dhrymes's R-squared:                 0.6950\n",
+      "Time:                        09:28:53   Dhrymes's R-squared:                 0.6950\n",
       "                                        Cov. Estimator:                  unadjusted\n",
       "                                        Num. Constraints:                      None\n",
       "                Equation: benefits, Dependent Variable: hrbens                \n",
@@ -141,10 +141,10 @@
    "execution_count": 4,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:41.338326Z",
-     "iopub.status.busy": "2024-09-24T09:24:41.338050Z",
-     "iopub.status.idle": "2024-09-24T09:24:41.391145Z",
-     "shell.execute_reply": "2024-09-24T09:24:41.390487Z"
+     "iopub.execute_input": "2024-09-24T09:28:53.082843Z",
+     "iopub.status.busy": "2024-09-24T09:28:53.081918Z",
+     "iopub.status.idle": "2024-09-24T09:28:53.140656Z",
+     "shell.execute_reply": "2024-09-24T09:28:53.139936Z"
     }
    },
    "outputs": [
@@ -158,7 +158,7 @@
       "No. Equations.:                     2   McElroy's R-squared:                 0.2197\n",
       "No. Observations:                 616   Judge's (OLS) R-squared:             0.1873\n",
       "Date:                Tue, Sep 24 2024   Berndt's R-squared:                  0.3775\n",
-      "Time:                        09:24:41   Dhrymes's R-squared:                 0.6950\n",
+      "Time:                        09:28:53   Dhrymes's R-squared:                 0.6950\n",
       "                                        Cov. Estimator:                  unadjusted\n",
       "                                        Num. Constraints:                      None\n",
       "                 Equation: hrbens, Dependent Variable: hrbens                 \n",
@@ -218,10 +218,10 @@
    "execution_count": 5,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:41.393999Z",
-     "iopub.status.busy": "2024-09-24T09:24:41.393657Z",
-     "iopub.status.idle": "2024-09-24T09:24:41.429026Z",
-     "shell.execute_reply": "2024-09-24T09:24:41.428125Z"
+     "iopub.execute_input": "2024-09-24T09:28:53.144073Z",
+     "iopub.status.busy": "2024-09-24T09:28:53.143721Z",
+     "iopub.status.idle": "2024-09-24T09:28:53.188688Z",
+     "shell.execute_reply": "2024-09-24T09:28:53.188002Z"
     }
    },
    "outputs": [
@@ -277,10 +277,10 @@
    "execution_count": 6,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:41.433070Z",
-     "iopub.status.busy": "2024-09-24T09:24:41.432095Z",
-     "iopub.status.idle": "2024-09-24T09:24:41.484013Z",
-     "shell.execute_reply": "2024-09-24T09:24:41.483307Z"
+     "iopub.execute_input": "2024-09-24T09:28:53.191621Z",
+     "iopub.status.busy": "2024-09-24T09:28:53.191381Z",
+     "iopub.status.idle": "2024-09-24T09:28:53.248163Z",
+     "shell.execute_reply": "2024-09-24T09:28:53.247404Z"
     }
    },
    "outputs": [
@@ -290,35 +290,35 @@
      "text": [
       "                           System GLS Estimation Summary                           \n",
       "===================================================================================\n",
-      "Estimator:                        GLS   Overall R-squared:                   0.7266\n",
-      "No. Equations.:                     2   McElroy's R-squared:                 0.2194\n",
-      "No. Observations:                 616   Judge's (OLS) R-squared:             0.1732\n",
-      "Date:                Tue, Sep 24 2024   Berndt's R-squared:                  0.2575\n",
-      "Time:                        09:24:41   Dhrymes's R-squared:                 0.7266\n",
+      "Estimator:                        GLS   Overall R-squared:                   0.7242\n",
+      "No. Equations.:                     2   McElroy's R-squared:                 0.2136\n",
+      "No. Observations:                 616   Judge's (OLS) R-squared:             0.1411\n",
+      "Date:                Tue, Sep 24 2024   Berndt's R-squared:                  0.1834\n",
+      "Time:                        09:28:53   Dhrymes's R-squared:                 0.7243\n",
       "                                        Cov. Estimator:                      robust\n",
       "                                        Num. Constraints:                      None\n",
       "                Equation: benefits, Dependent Variable: hrbens                \n",
       "==============================================================================\n",
       "            Parameter  Std. Err.     T-stat    P-value    Lower CI    Upper CI\n",
       "------------------------------------------------------------------------------\n",
-      "educ           0.0407     0.0047     8.7024     0.0000      0.0315      0.0499\n",
-      "exper          0.0254     0.0060     4.1985     0.0000      0.0135      0.0372\n",
-      "expersq       -0.0003     0.0001    -2.3756     0.0175     -0.0006   -5.89e-05\n",
-      "union          0.4078     0.0497     8.2104     0.0000      0.3105      0.5052\n",
-      "south         -0.1924     0.0540    -3.5645     0.0004     -0.2982     -0.0866\n",
-      "nrtheast      -0.1834     0.0670    -2.7354     0.0062     -0.3147     -0.0520\n",
-      "nrthcen       -0.1713     0.0582    -2.9415     0.0033     -0.2854     -0.0572\n",
-      "male           0.2400     0.0462     5.1905     0.0000      0.1494      0.3307\n",
+      "educ           0.0331     0.0046     7.1660     0.0000      0.0241      0.0422\n",
+      "exper          0.0352     0.0053     6.5899     0.0000      0.0247      0.0457\n",
+      "expersq       -0.0006     0.0001    -5.2702     0.0000     -0.0009     -0.0004\n",
+      "union          0.3703     0.0496     7.4677     0.0000      0.2731      0.4674\n",
+      "south         -0.1909     0.0538    -3.5463     0.0004     -0.2964     -0.0854\n",
+      "nrtheast      -0.1529     0.0652    -2.3438     0.0191     -0.2807     -0.0250\n",
+      "nrthcen       -0.1117     0.0574    -1.9475     0.0515     -0.2242      0.0007\n",
+      "male           0.2625     0.0463     5.6651     0.0000      0.1717      0.3533\n",
       "                Equation: earnings, Dependent Variable: hrearn                \n",
       "==============================================================================\n",
       "            Parameter  Std. Err.     T-stat    P-value    Lower CI    Upper CI\n",
       "------------------------------------------------------------------------------\n",
-      "educ           0.3736     0.0936     3.9896     0.0001      0.1901      0.5572\n",
-      "exper         -0.1532     0.2096    -0.7309     0.4649     -0.5639      0.2576\n",
-      "expersq        0.0061     0.0055     1.1221     0.2618     -0.0046      0.0168\n",
-      "nrtheast      -1.1416     0.5478    -2.0839     0.0372     -2.2154     -0.0679\n",
-      "married        0.4509     0.2955     1.5261     0.1270     -0.1282      1.0300\n",
-      "male           2.3767     0.2408     9.8684     0.0000      1.9047      2.8487\n",
+      "educ           0.4434     0.1118     3.9650     0.0001      0.2242      0.6625\n",
+      "exper         -0.2994     0.2570    -1.1647     0.2441     -0.8032      0.2044\n",
+      "expersq        0.0097     0.0068     1.4231     0.1547     -0.0036      0.0230\n",
+      "nrtheast      -0.9905     0.5735    -1.7271     0.0842     -2.1146      0.1336\n",
+      "married        0.7634     0.4524     1.6875     0.0915     -0.1233      1.6500\n",
+      "male           1.9960     0.2404     8.3036     0.0000      1.5248      2.4671\n",
       "==============================================================================\n",
       "\n",
       "Covariance Estimator:\n",
diff --git a/devel/system/examples/three-stage-ls.html b/devel/system/examples/three-stage-ls.html
index adcd160aed..a6a424fb3a 100644
--- a/devel/system/examples/three-stage-ls.html
+++ b/devel/system/examples/three-stage-ls.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Three-stage Least Squares (3SLS) - linearmodels v6.1 (+13)</title>
+        <title>Three-stage Least Squares (3SLS) - linearmodels v6.1 (+15)</title>
       
     
 
@@ -94,7 +94,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -104,7 +104,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -191,10 +191,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
@@ -791,7 +791,7 @@ <h2 id="Formulas">Formulas<a class="headerlink" href="#Formulas" title="Link to
 Estimator:                    IV-2SLS   Adj. R-squared:                 0.1807
 No. Observations:                 428   F-statistic:                    399.30
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000
-Time:                        09:24:45   Distribution:                  chi2(5)
+Time:                        09:28:57   Distribution:                  chi2(5)
 Cov. Estimator:            unadjusted
 
                              Parameter Estimates
@@ -835,7 +835,7 @@ <h2 id="Formulas">Formulas<a class="headerlink" href="#Formulas" title="Link to
 Estimator:                    IV-2SLS   Adj. R-squared:                 0.7559
 No. Observations:                 428   F-statistic:                    1362.4
 Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000
-Time:                        09:24:45   Distribution:                  chi2(4)
+Time:                        09:28:57   Distribution:                  chi2(4)
 Cov. Estimator:            unadjusted
 
                              Parameter Estimates
@@ -878,7 +878,7 @@ <h2 id="Formulas">Formulas<a class="headerlink" href="#Formulas" title="Link to
 No. Equations.:                     2   McElroy&#39;s R-squared:                 0.1276
 No. Observations:                 428   Judge&#39;s (OLS) R-squared:            -2.0961
 Date:                Tue, Sep 24 2024   Berndt&#39;s R-squared:                 -0.7279
-Time:                        09:24:45   Dhrymes&#39;s R-squared:                 0.1903
+Time:                        09:28:57   Dhrymes&#39;s R-squared:                 0.1903
                                         Cov. Estimator:                  unadjusted
                                         Num. Constraints:                      None
                   Equation: hours, Dependent Variable: hours
@@ -937,7 +937,7 @@ <h2 id="Formulas">Formulas<a class="headerlink" href="#Formulas" title="Link to
 No. Equations.:                     2   McElroy&#39;s R-squared:                 0.0873
 No. Observations:                 428   Judge&#39;s (OLS) R-squared:            -2.7778
 Date:                Tue, Sep 24 2024   Berndt&#39;s R-squared:                 -0.7279
-Time:                        09:24:45   Dhrymes&#39;s R-squared:                 0.0120
+Time:                        09:28:57   Dhrymes&#39;s R-squared:                 0.0120
                                         Cov. Estimator:                  unadjusted
                                         Num. Constraints:                      None
                   Equation: hours, Dependent Variable: hours
@@ -1018,7 +1018,7 @@ <h2 id="Direct-Model-Specification">Direct Model Specification<a class="headerli
 No. Equations.:                     2   McElroy&#39;s R-squared:                 0.0873
 No. Observations:                 428   Judge&#39;s (OLS) R-squared:            -2.7778
 Date:                Tue, Sep 24 2024   Berndt&#39;s R-squared:                 -0.7279
-Time:                        09:24:45   Dhrymes&#39;s R-squared:                 0.0120
+Time:                        09:28:57   Dhrymes&#39;s R-squared:                 0.0120
                                         Cov. Estimator:                  unadjusted
                                         Num. Constraints:                      None
                   Equation: hours, Dependent Variable: hours
@@ -1084,7 +1084,7 @@ <h2 id="System-GMM-Estimation">System GMM Estimation<a class="headerlink" href="
 No. Equations.:                     2   McElroy&#39;s R-squared:                 0.0871
 No. Observations:                 428   Judge&#39;s (OLS) R-squared:            -2.7776
 Date:                Tue, Sep 24 2024   Berndt&#39;s R-squared:                 -0.7268
-Time:                        09:24:45   Dhrymes&#39;s R-squared:                 0.0121
+Time:                        09:28:57   Dhrymes&#39;s R-squared:                 0.0121
                                         Cov. Estimator:                  unadjusted
                                         Num. Constraints:                      None
                   Equation: hours, Dependent Variable: hours
@@ -1146,7 +1146,7 @@ <h2 id="System-GMM-Estimation">System GMM Estimation<a class="headerlink" href="
 No. Equations.:                       2   McElroy&#39;s R-squared:                -0.2256
 No. Observations:                   428   Judge&#39;s (OLS) R-squared:            -2.9557
 Date:                  Tue, Sep 24 2024   Berndt&#39;s R-squared:                 -2.0361
-Time:                          09:24:45   Dhrymes&#39;s R-squared:                -0.0345
+Time:                          09:28:57   Dhrymes&#39;s R-squared:                -0.0345
                                           Cov. Estimator:                      robust
                                           Num. Constraints:                      None
                   Equation: hours, Dependent Variable: hours
@@ -1232,7 +1232,7 @@ <h2 id="Simultaneous-Equations">Simultaneous Equations<a class="headerlink" href
 No. Equations.:                     2   McElroy&#39;s R-squared:                 0.0014
 No. Observations:               50000   Judge&#39;s (OLS) R-squared:             0.0013
 Date:                Tue, Sep 24 2024   Berndt&#39;s R-squared:                  0.0027
-Time:                        09:24:46   Dhrymes&#39;s R-squared:                 0.0013
+Time:                        09:28:57   Dhrymes&#39;s R-squared:                 0.0013
                                         Cov. Estimator:                      robust
                                         Num. Constraints:                      None
                      Equation: y1, Dependent Variable: y1
diff --git a/devel/system/examples/three-stage-ls.ipynb b/devel/system/examples/three-stage-ls.ipynb
index 26f8cf398c..e2adfc495d 100644
--- a/devel/system/examples/three-stage-ls.ipynb
+++ b/devel/system/examples/three-stage-ls.ipynb
@@ -33,10 +33,10 @@
    "execution_count": 1,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:43.811607Z",
-     "iopub.status.busy": "2024-09-24T09:24:43.811154Z",
-     "iopub.status.idle": "2024-09-24T09:24:45.372948Z",
-     "shell.execute_reply": "2024-09-24T09:24:45.372045Z"
+     "iopub.execute_input": "2024-09-24T09:28:55.452491Z",
+     "iopub.status.busy": "2024-09-24T09:28:55.452220Z",
+     "iopub.status.idle": "2024-09-24T09:28:56.931755Z",
+     "shell.execute_reply": "2024-09-24T09:28:56.930984Z"
     }
    },
    "outputs": [],
@@ -58,10 +58,10 @@
    "execution_count": 2,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:45.376082Z",
-     "iopub.status.busy": "2024-09-24T09:24:45.375811Z",
-     "iopub.status.idle": "2024-09-24T09:24:45.382293Z",
-     "shell.execute_reply": "2024-09-24T09:24:45.381616Z"
+     "iopub.execute_input": "2024-09-24T09:28:56.935288Z",
+     "iopub.status.busy": "2024-09-24T09:28:56.934820Z",
+     "iopub.status.idle": "2024-09-24T09:28:56.947488Z",
+     "shell.execute_reply": "2024-09-24T09:28:56.946739Z"
     }
    },
    "outputs": [],
@@ -88,10 +88,10 @@
    "execution_count": 3,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:45.385991Z",
-     "iopub.status.busy": "2024-09-24T09:24:45.385033Z",
-     "iopub.status.idle": "2024-09-24T09:24:45.389274Z",
-     "shell.execute_reply": "2024-09-24T09:24:45.388739Z"
+     "iopub.execute_input": "2024-09-24T09:28:56.950151Z",
+     "iopub.status.busy": "2024-09-24T09:28:56.949846Z",
+     "iopub.status.idle": "2024-09-24T09:28:56.960095Z",
+     "shell.execute_reply": "2024-09-24T09:28:56.959369Z"
     }
    },
    "outputs": [],
@@ -113,10 +113,10 @@
    "execution_count": 4,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:45.392249Z",
-     "iopub.status.busy": "2024-09-24T09:24:45.391989Z",
-     "iopub.status.idle": "2024-09-24T09:24:45.422113Z",
-     "shell.execute_reply": "2024-09-24T09:24:45.421396Z"
+     "iopub.execute_input": "2024-09-24T09:28:56.962612Z",
+     "iopub.status.busy": "2024-09-24T09:28:56.962305Z",
+     "iopub.status.idle": "2024-09-24T09:28:57.016053Z",
+     "shell.execute_reply": "2024-09-24T09:28:57.015361Z"
     }
    },
    "outputs": [
@@ -130,7 +130,7 @@
       "Estimator:                    IV-2SLS   Adj. R-squared:                 0.1807\n",
       "No. Observations:                 428   F-statistic:                    399.30\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000\n",
-      "Time:                        09:24:45   Distribution:                  chi2(5)\n",
+      "Time:                        09:28:57   Distribution:                  chi2(5)\n",
       "Cov. Estimator:            unadjusted                                         \n",
       "                                                                              \n",
       "                             Parameter Estimates                              \n",
@@ -171,10 +171,10 @@
    "execution_count": 5,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:45.424835Z",
-     "iopub.status.busy": "2024-09-24T09:24:45.424595Z",
-     "iopub.status.idle": "2024-09-24T09:24:45.453037Z",
-     "shell.execute_reply": "2024-09-24T09:24:45.452373Z"
+     "iopub.execute_input": "2024-09-24T09:28:57.023258Z",
+     "iopub.status.busy": "2024-09-24T09:28:57.022754Z",
+     "iopub.status.idle": "2024-09-24T09:28:57.079139Z",
+     "shell.execute_reply": "2024-09-24T09:28:57.075889Z"
     }
    },
    "outputs": [
@@ -188,7 +188,7 @@
       "Estimator:                    IV-2SLS   Adj. R-squared:                 0.7559\n",
       "No. Observations:                 428   F-statistic:                    1362.4\n",
       "Date:                Tue, Sep 24 2024   P-value (F-stat)                0.0000\n",
-      "Time:                        09:24:45   Distribution:                  chi2(4)\n",
+      "Time:                        09:28:57   Distribution:                  chi2(4)\n",
       "Cov. Estimator:            unadjusted                                         \n",
       "                                                                              \n",
       "                             Parameter Estimates                              \n",
@@ -230,10 +230,10 @@
    "execution_count": 6,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:45.456277Z",
-     "iopub.status.busy": "2024-09-24T09:24:45.456026Z",
-     "iopub.status.idle": "2024-09-24T09:24:45.507231Z",
-     "shell.execute_reply": "2024-09-24T09:24:45.504285Z"
+     "iopub.execute_input": "2024-09-24T09:28:57.087225Z",
+     "iopub.status.busy": "2024-09-24T09:28:57.086694Z",
+     "iopub.status.idle": "2024-09-24T09:28:57.170658Z",
+     "shell.execute_reply": "2024-09-24T09:28:57.169995Z"
     }
    },
    "outputs": [
@@ -247,7 +247,7 @@
       "No. Equations.:                     2   McElroy's R-squared:                 0.1276\n",
       "No. Observations:                 428   Judge's (OLS) R-squared:            -2.0961\n",
       "Date:                Tue, Sep 24 2024   Berndt's R-squared:                 -0.7279\n",
-      "Time:                        09:24:45   Dhrymes's R-squared:                 0.1903\n",
+      "Time:                        09:28:57   Dhrymes's R-squared:                 0.1903\n",
       "                                        Cov. Estimator:                  unadjusted\n",
       "                                        Num. Constraints:                      None\n",
       "                  Equation: hours, Dependent Variable: hours                  \n",
@@ -303,10 +303,10 @@
    "execution_count": 7,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:45.513055Z",
-     "iopub.status.busy": "2024-09-24T09:24:45.509685Z",
-     "iopub.status.idle": "2024-09-24T09:24:45.600257Z",
-     "shell.execute_reply": "2024-09-24T09:24:45.599620Z"
+     "iopub.execute_input": "2024-09-24T09:28:57.173764Z",
+     "iopub.status.busy": "2024-09-24T09:28:57.173475Z",
+     "iopub.status.idle": "2024-09-24T09:28:57.275341Z",
+     "shell.execute_reply": "2024-09-24T09:28:57.274496Z"
     }
    },
    "outputs": [
@@ -320,7 +320,7 @@
       "No. Equations.:                     2   McElroy's R-squared:                 0.0873\n",
       "No. Observations:                 428   Judge's (OLS) R-squared:            -2.7778\n",
       "Date:                Tue, Sep 24 2024   Berndt's R-squared:                 -0.7279\n",
-      "Time:                        09:24:45   Dhrymes's R-squared:                 0.0120\n",
+      "Time:                        09:28:57   Dhrymes's R-squared:                 0.0120\n",
       "                                        Cov. Estimator:                  unadjusted\n",
       "                                        Num. Constraints:                      None\n",
       "                  Equation: hours, Dependent Variable: hours                  \n",
@@ -353,7 +353,14 @@
       "----------------------\n",
       "\n",
       "Covariance Estimator:\n",
-      "Homoskedastic (Unadjusted) Covariance (Debiased: False, GLS: True)\n"
+      "Homoskedastic (Unadjusted) Covariance (Debiased: False, GLS: True)"
+     ]
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "\n"
      ]
     }
    ],
@@ -385,10 +392,10 @@
    "execution_count": 8,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:45.604852Z",
-     "iopub.status.busy": "2024-09-24T09:24:45.604595Z",
-     "iopub.status.idle": "2024-09-24T09:24:45.679508Z",
-     "shell.execute_reply": "2024-09-24T09:24:45.678767Z"
+     "iopub.execute_input": "2024-09-24T09:28:57.279535Z",
+     "iopub.status.busy": "2024-09-24T09:28:57.279239Z",
+     "iopub.status.idle": "2024-09-24T09:28:57.365096Z",
+     "shell.execute_reply": "2024-09-24T09:28:57.364199Z"
     }
    },
    "outputs": [
@@ -402,7 +409,7 @@
       "No. Equations.:                     2   McElroy's R-squared:                 0.0873\n",
       "No. Observations:                 428   Judge's (OLS) R-squared:            -2.7778\n",
       "Date:                Tue, Sep 24 2024   Berndt's R-squared:                 -0.7279\n",
-      "Time:                        09:24:45   Dhrymes's R-squared:                 0.0120\n",
+      "Time:                        09:28:57   Dhrymes's R-squared:                 0.0120\n",
       "                                        Cov. Estimator:                  unadjusted\n",
       "                                        Num. Constraints:                      None\n",
       "                  Equation: hours, Dependent Variable: hours                  \n",
@@ -480,10 +487,10 @@
    "execution_count": 9,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:45.685415Z",
-     "iopub.status.busy": "2024-09-24T09:24:45.685159Z",
-     "iopub.status.idle": "2024-09-24T09:24:45.744627Z",
-     "shell.execute_reply": "2024-09-24T09:24:45.743930Z"
+     "iopub.execute_input": "2024-09-24T09:28:57.371167Z",
+     "iopub.status.busy": "2024-09-24T09:28:57.368260Z",
+     "iopub.status.idle": "2024-09-24T09:28:57.483837Z",
+     "shell.execute_reply": "2024-09-24T09:28:57.483094Z"
     }
    },
    "outputs": [
@@ -497,7 +504,7 @@
       "No. Equations.:                     2   McElroy's R-squared:                 0.0871\n",
       "No. Observations:                 428   Judge's (OLS) R-squared:            -2.7776\n",
       "Date:                Tue, Sep 24 2024   Berndt's R-squared:                 -0.7268\n",
-      "Time:                        09:24:45   Dhrymes's R-squared:                 0.0121\n",
+      "Time:                        09:28:57   Dhrymes's R-squared:                 0.0121\n",
       "                                        Cov. Estimator:                  unadjusted\n",
       "                                        Num. Constraints:                      None\n",
       "                  Equation: hours, Dependent Variable: hours                  \n",
@@ -558,10 +565,10 @@
    "execution_count": 10,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:45.748617Z",
-     "iopub.status.busy": "2024-09-24T09:24:45.747658Z",
-     "iopub.status.idle": "2024-09-24T09:24:45.863182Z",
-     "shell.execute_reply": "2024-09-24T09:24:45.857865Z"
+     "iopub.execute_input": "2024-09-24T09:28:57.490160Z",
+     "iopub.status.busy": "2024-09-24T09:28:57.489819Z",
+     "iopub.status.idle": "2024-09-24T09:28:57.604727Z",
+     "shell.execute_reply": "2024-09-24T09:28:57.604000Z"
     }
    },
    "outputs": [
@@ -576,7 +583,7 @@
       "No. Equations.:                       2   McElroy's R-squared:                -0.2256\n",
       "No. Observations:                   428   Judge's (OLS) R-squared:            -2.9557\n",
       "Date:                  Tue, Sep 24 2024   Berndt's R-squared:                 -2.0361\n",
-      "Time:                          09:24:45   Dhrymes's R-squared:                -0.0345\n",
+      "Time:                          09:28:57   Dhrymes's R-squared:                -0.0345\n",
       "                                          Cov. Estimator:                      robust\n",
       "                                          Num. Constraints:                      None\n",
       "                  Equation: hours, Dependent Variable: hours                  \n",
@@ -653,10 +660,10 @@
    "execution_count": 11,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:45.866384Z",
-     "iopub.status.busy": "2024-09-24T09:24:45.866082Z",
-     "iopub.status.idle": "2024-09-24T09:24:46.278330Z",
-     "shell.execute_reply": "2024-09-24T09:24:46.277619Z"
+     "iopub.execute_input": "2024-09-24T09:28:57.611168Z",
+     "iopub.status.busy": "2024-09-24T09:28:57.607719Z",
+     "iopub.status.idle": "2024-09-24T09:28:57.928717Z",
+     "shell.execute_reply": "2024-09-24T09:28:57.928070Z"
     }
    },
    "outputs": [
@@ -670,7 +677,7 @@
       "No. Equations.:                     2   McElroy's R-squared:                 0.0014\n",
       "No. Observations:               50000   Judge's (OLS) R-squared:             0.0013\n",
       "Date:                Tue, Sep 24 2024   Berndt's R-squared:                  0.0027\n",
-      "Time:                        09:24:46   Dhrymes's R-squared:                 0.0013\n",
+      "Time:                        09:28:57   Dhrymes's R-squared:                 0.0013\n",
       "                                        Cov. Estimator:                      robust\n",
       "                                        Num. Constraints:                      None\n",
       "                     Equation: y1, Dependent Variable: y1                     \n",
@@ -733,10 +740,10 @@
    "execution_count": 12,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:46.290367Z",
-     "iopub.status.busy": "2024-09-24T09:24:46.287051Z",
-     "iopub.status.idle": "2024-09-24T09:24:46.358780Z",
-     "shell.execute_reply": "2024-09-24T09:24:46.357906Z"
+     "iopub.execute_input": "2024-09-24T09:28:57.933533Z",
+     "iopub.status.busy": "2024-09-24T09:28:57.933239Z",
+     "iopub.status.idle": "2024-09-24T09:28:58.007010Z",
+     "shell.execute_reply": "2024-09-24T09:28:58.004149Z"
     }
    },
    "outputs": [
@@ -864,10 +871,10 @@
    "execution_count": 13,
    "metadata": {
     "execution": {
-     "iopub.execute_input": "2024-09-24T09:24:46.362668Z",
-     "iopub.status.busy": "2024-09-24T09:24:46.362403Z",
-     "iopub.status.idle": "2024-09-24T09:24:46.388145Z",
-     "shell.execute_reply": "2024-09-24T09:24:46.384749Z"
+     "iopub.execute_input": "2024-09-24T09:28:58.010215Z",
+     "iopub.status.busy": "2024-09-24T09:28:58.009927Z",
+     "iopub.status.idle": "2024-09-24T09:28:58.037857Z",
+     "shell.execute_reply": "2024-09-24T09:28:58.037049Z"
     }
    },
    "outputs": [
diff --git a/devel/system/index.html b/devel/system/index.html
index cfce205835..4fdf3f6d45 100644
--- a/devel/system/index.html
+++ b/devel/system/index.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>System Regression Models - linearmodels v6.1 (+13)</title>
+        <title>System Regression Models - linearmodels v6.1 (+15)</title>
       
     
 
@@ -88,7 +88,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -98,7 +98,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -185,10 +185,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/mathematical-formula.html b/devel/system/mathematical-formula.html
index 5c1d4ca04a..fb59eba72e 100644
--- a/devel/system/mathematical-formula.html
+++ b/devel/system/mathematical-formula.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Seemingly Unrelated Regression (SUR/SURE) - linearmodels v6.1 (+13)</title>
+        <title>Seemingly Unrelated Regression (SUR/SURE) - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/reference.html b/devel/system/reference.html
index c333afd1e8..0ea26f8ace 100644
--- a/devel/system/reference.html
+++ b/devel/system/reference.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>Module Reference - linearmodels v6.1 (+13)</title>
+        <title>Module Reference - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.covariance.ClusteredCovariance.cov.html b/devel/system/system/linearmodels.system.covariance.ClusteredCovariance.cov.html
index 143437cf3a..640346815c 100644
--- a/devel/system/system/linearmodels.system.covariance.ClusteredCovariance.cov.html
+++ b/devel/system/system/linearmodels.system.covariance.ClusteredCovariance.cov.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.covariance.ClusteredCovariance.cov - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.covariance.ClusteredCovariance.cov - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.covariance.ClusteredCovariance.cov_config.html b/devel/system/system/linearmodels.system.covariance.ClusteredCovariance.cov_config.html
index 9054e5c43c..988c409a37 100644
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@@ -15,7 +15,7 @@
     
   
       
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+            linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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+    linearmodels v6.1 (+15)
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-            linearmodels v6.1 (+13)
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+    linearmodels v6.1 (+15)
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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+    linearmodels v6.1 (+15)
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diff --git a/devel/system/system/linearmodels.system.covariance.KernelCovariance.sigma.html b/devel/system/system/linearmodels.system.covariance.KernelCovariance.sigma.html
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.system.gmm.HeteroskedasticWeightMatrix - linearmodels v6.1 (+15)</title>
       
     
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/system/system/linearmodels.system.gmm.HeteroskedasticWeightMatrix.sigma.html b/devel/system/system/linearmodels.system.gmm.HeteroskedasticWeightMatrix.sigma.html
index 0d31a164f1..61fc3d1e60 100644
--- a/devel/system/system/linearmodels.system.gmm.HeteroskedasticWeightMatrix.sigma.html
+++ b/devel/system/system/linearmodels.system.gmm.HeteroskedasticWeightMatrix.sigma.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.gmm.HeteroskedasticWeightMatrix.sigma - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.gmm.HeteroskedasticWeightMatrix.sigma - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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index caf08a5a97..85c4eab61d 100644
--- a/devel/system/system/linearmodels.system.gmm.HeteroskedasticWeightMatrix.weight_matrix.html
+++ b/devel/system/system/linearmodels.system.gmm.HeteroskedasticWeightMatrix.weight_matrix.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.gmm.HeteroskedasticWeightMatrix.weight_matrix - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.gmm.HeteroskedasticWeightMatrix.weight_matrix - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/system/system/linearmodels.system.gmm.HomoskedasticWeightMatrix.config.html b/devel/system/system/linearmodels.system.gmm.HomoskedasticWeightMatrix.config.html
index e588d4b19d..46e30f4726 100644
--- a/devel/system/system/linearmodels.system.gmm.HomoskedasticWeightMatrix.config.html
+++ b/devel/system/system/linearmodels.system.gmm.HomoskedasticWeightMatrix.config.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.gmm.HomoskedasticWeightMatrix.config - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.gmm.HomoskedasticWeightMatrix.config - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/system/system/linearmodels.system.gmm.HomoskedasticWeightMatrix.html b/devel/system/system/linearmodels.system.gmm.HomoskedasticWeightMatrix.html
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--- a/devel/system/system/linearmodels.system.gmm.HomoskedasticWeightMatrix.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.gmm.HomoskedasticWeightMatrix - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.gmm.HomoskedasticWeightMatrix - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.gmm.HomoskedasticWeightMatrix.sigma.html b/devel/system/system/linearmodels.system.gmm.HomoskedasticWeightMatrix.sigma.html
index c4fe5f44b5..496e864d4c 100644
--- a/devel/system/system/linearmodels.system.gmm.HomoskedasticWeightMatrix.sigma.html
+++ b/devel/system/system/linearmodels.system.gmm.HomoskedasticWeightMatrix.sigma.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.gmm.HomoskedasticWeightMatrix.sigma - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.gmm.HomoskedasticWeightMatrix.sigma - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.gmm.HomoskedasticWeightMatrix.weight_matrix.html b/devel/system/system/linearmodels.system.gmm.HomoskedasticWeightMatrix.weight_matrix.html
index 5925ba8530..032b01b005 100644
--- a/devel/system/system/linearmodels.system.gmm.HomoskedasticWeightMatrix.weight_matrix.html
+++ b/devel/system/system/linearmodels.system.gmm.HomoskedasticWeightMatrix.weight_matrix.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.gmm.HomoskedasticWeightMatrix.weight_matrix - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.gmm.HomoskedasticWeightMatrix.weight_matrix - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/system/system/linearmodels.system.gmm.KernelWeightMatrix.bandwidth.html b/devel/system/system/linearmodels.system.gmm.KernelWeightMatrix.bandwidth.html
index 9f3418490c..d70059d95a 100644
--- a/devel/system/system/linearmodels.system.gmm.KernelWeightMatrix.bandwidth.html
+++ b/devel/system/system/linearmodels.system.gmm.KernelWeightMatrix.bandwidth.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.gmm.KernelWeightMatrix.bandwidth - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.gmm.KernelWeightMatrix.bandwidth - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.gmm.KernelWeightMatrix.config.html b/devel/system/system/linearmodels.system.gmm.KernelWeightMatrix.config.html
index 41199b1de4..8e86fddeca 100644
--- a/devel/system/system/linearmodels.system.gmm.KernelWeightMatrix.config.html
+++ b/devel/system/system/linearmodels.system.gmm.KernelWeightMatrix.config.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.gmm.KernelWeightMatrix.config - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.gmm.KernelWeightMatrix.config - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.gmm.KernelWeightMatrix.html b/devel/system/system/linearmodels.system.gmm.KernelWeightMatrix.html
index 2738887707..422c42c621 100644
--- a/devel/system/system/linearmodels.system.gmm.KernelWeightMatrix.html
+++ b/devel/system/system/linearmodels.system.gmm.KernelWeightMatrix.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.gmm.KernelWeightMatrix - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.gmm.KernelWeightMatrix - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.breusch_pagan.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.breusch_pagan.html
index b5a042c215..b1f7a7cdff 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.breusch_pagan.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.breusch_pagan.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.breusch_pagan - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.breusch_pagan - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.conf_int.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.conf_int.html
index 0ec40fcf1d..5db237a311 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.conf_int.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.conf_int.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.conf_int - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.conf_int - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.cov.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.cov.html
index 56b2f2a97d..dab7c01315 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.cov.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.cov.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.cov - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.cov - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.cov_config.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.cov_config.html
index aff4b802b5..a9419c25a2 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.cov_config.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.cov_config.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.cov_config - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.cov_config - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.cov_estimator.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.cov_estimator.html
index 9b7c79d757..0ec4872830 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.cov_estimator.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.cov_estimator.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.cov_estimator - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.cov_estimator - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.debiased.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.debiased.html
index 9e7d547e2c..17fa031146 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.debiased.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.debiased.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.debiased - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.debiased - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.df_model.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.df_model.html
index 2111ab3131..5102301a5e 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.df_model.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.df_model.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.df_model - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.df_model - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.df_resid.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.df_resid.html
index d8463b3165..e2f8819625 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.df_resid.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.df_resid.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.df_resid - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.df_resid - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.equation_labels.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.equation_labels.html
index 9eb2d7d99e..306e3b6f21 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.equation_labels.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.equation_labels.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.equation_labels - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.equation_labels - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.equations.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.equations.html
index a8f4756a4a..1d95d99883 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.equations.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.equations.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.equations - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.equations - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.fitted_values.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.fitted_values.html
index acea856393..8c5f7ea191 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.fitted_values.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.fitted_values.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.fitted_values - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.fitted_values - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.html
index 86388f5167..3b0ed6646b 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.iterations.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.iterations.html
index 4940a3eac3..e0a55308c8 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.iterations.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.iterations.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.iterations - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.iterations - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.j_stat.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.j_stat.html
index ef86b5dda4..05315fa35c 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.j_stat.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.j_stat.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.j_stat - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.j_stat - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.likelihood_ratio.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.likelihood_ratio.html
index b19ccb29e1..286c41e92b 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.likelihood_ratio.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.likelihood_ratio.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.likelihood_ratio - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.likelihood_ratio - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.method.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.method.html
index adb1fd0052..04951e2472 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.method.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.method.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.method - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.method - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.model.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.model.html
index 334793fa14..274af29fd8 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.model.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.model.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.model - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.model - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.model_ss.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.model_ss.html
index 1750ae8d2b..bd2a326fc5 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.model_ss.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.model_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.model_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.model_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.nobs.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.nobs.html
index 5ced86839e..dfd0d01a66 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.nobs.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.nobs.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.nobs - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.nobs - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.params.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.params.html
index 9e954eaed6..c58e5855f6 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.params.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.params.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.params - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.params - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.predict.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.predict.html
index d9af1e95e1..8c79765d7b 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.predict.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.predict.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.predict - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.predict - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.pvalues.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.pvalues.html
index 8948f028f6..2abbd4ff84 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.pvalues.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.pvalues.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.pvalues - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.pvalues - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.resid_ss.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.resid_ss.html
index f8dfa50380..a71f957bd7 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.resid_ss.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.resid_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.resid_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.resid_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.resids.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.resids.html
index 472da48d7c..b73e72ea61 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.resids.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.resids.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.resids - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.resids - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.rsquared.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.rsquared.html
index 3282f14b50..4189ee0307 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.rsquared.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.rsquared.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.rsquared - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.rsquared - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.sigma.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.sigma.html
index f90a3aa24c..4640efacbe 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.sigma.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.sigma.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.sigma - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.sigma - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.std_errors.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.std_errors.html
index 4e901cf345..0b1adcc110 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.std_errors.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.std_errors.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.std_errors - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.std_errors - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.summary.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.summary.html
index 96d51bbe5d..55ce89311c 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.summary.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.summary.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.summary - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.summary - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.system_rsquared.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.system_rsquared.html
index 510a80b7a8..5ffcc72ebe 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.system_rsquared.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.system_rsquared.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.system_rsquared - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.system_rsquared - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.total_ss.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.total_ss.html
index edce66985d..cfc0235793 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.total_ss.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.total_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.total_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.total_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.tstats.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.tstats.html
index 1e9ae8c04e..fba4749ab6 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.tstats.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.tstats.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.tstats - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.tstats - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.w.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.w.html
index 91448ce1c1..bb6a8c5afd 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.w.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.w.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.w - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.w - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.weight_config.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.weight_config.html
index 18eae7bf96..9324d470b7 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.weight_config.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.weight_config.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.weight_config - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.weight_config - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.weight_type.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.weight_type.html
index 0605fff619..d435338225 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.weight_type.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.weight_type.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.weight_type - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.weight_type - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.GMMSystemResults.wresids.html b/devel/system/system/linearmodels.system.results.GMMSystemResults.wresids.html
index 59c962cd05..e180e19b38 100644
--- a/devel/system/system/linearmodels.system.results.GMMSystemResults.wresids.html
+++ b/devel/system/system/linearmodels.system.results.GMMSystemResults.wresids.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.GMMSystemResults.wresids - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.GMMSystemResults.wresids - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.SystemResults.breusch_pagan.html b/devel/system/system/linearmodels.system.results.SystemResults.breusch_pagan.html
index 8bdc37da1f..945437a85d 100644
--- a/devel/system/system/linearmodels.system.results.SystemResults.breusch_pagan.html
+++ b/devel/system/system/linearmodels.system.results.SystemResults.breusch_pagan.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.breusch_pagan - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults.breusch_pagan - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.SystemResults.conf_int.html b/devel/system/system/linearmodels.system.results.SystemResults.conf_int.html
index bcceb12162..c0cf507e73 100644
--- a/devel/system/system/linearmodels.system.results.SystemResults.conf_int.html
+++ b/devel/system/system/linearmodels.system.results.SystemResults.conf_int.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.conf_int - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults.conf_int - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.SystemResults.cov.html b/devel/system/system/linearmodels.system.results.SystemResults.cov.html
index 351a8a4f04..e75d8e7182 100644
--- a/devel/system/system/linearmodels.system.results.SystemResults.cov.html
+++ b/devel/system/system/linearmodels.system.results.SystemResults.cov.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.cov - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults.cov - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.SystemResults.cov_config.html b/devel/system/system/linearmodels.system.results.SystemResults.cov_config.html
index ae89dbaac1..7b01d9e43f 100644
--- a/devel/system/system/linearmodels.system.results.SystemResults.cov_config.html
+++ b/devel/system/system/linearmodels.system.results.SystemResults.cov_config.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.cov_config - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults.cov_config - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.SystemResults.cov_estimator.html b/devel/system/system/linearmodels.system.results.SystemResults.cov_estimator.html
index e32fbd33e7..78b30a1d8c 100644
--- a/devel/system/system/linearmodels.system.results.SystemResults.cov_estimator.html
+++ b/devel/system/system/linearmodels.system.results.SystemResults.cov_estimator.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.cov_estimator - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults.cov_estimator - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/system/system/linearmodels.system.results.SystemResults.debiased.html b/devel/system/system/linearmodels.system.results.SystemResults.debiased.html
index 919f367b9d..b7b210f8f8 100644
--- a/devel/system/system/linearmodels.system.results.SystemResults.debiased.html
+++ b/devel/system/system/linearmodels.system.results.SystemResults.debiased.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.debiased - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults.debiased - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/system/system/linearmodels.system.results.SystemResults.df_model.html b/devel/system/system/linearmodels.system.results.SystemResults.df_model.html
index 7e2a3f78e1..90575c0c92 100644
--- a/devel/system/system/linearmodels.system.results.SystemResults.df_model.html
+++ b/devel/system/system/linearmodels.system.results.SystemResults.df_model.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.df_model - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults.df_model - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/system/system/linearmodels.system.results.SystemResults.df_resid.html b/devel/system/system/linearmodels.system.results.SystemResults.df_resid.html
index eabb88db27..2f3ec543ba 100644
--- a/devel/system/system/linearmodels.system.results.SystemResults.df_resid.html
+++ b/devel/system/system/linearmodels.system.results.SystemResults.df_resid.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.df_resid - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults.df_resid - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/system/system/linearmodels.system.results.SystemResults.equation_labels.html b/devel/system/system/linearmodels.system.results.SystemResults.equation_labels.html
index df4d497510..25540347f3 100644
--- a/devel/system/system/linearmodels.system.results.SystemResults.equation_labels.html
+++ b/devel/system/system/linearmodels.system.results.SystemResults.equation_labels.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.equation_labels - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults.equation_labels - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.SystemResults.equations.html b/devel/system/system/linearmodels.system.results.SystemResults.equations.html
index 1d9a2ff9bb..e7a4036ae0 100644
--- a/devel/system/system/linearmodels.system.results.SystemResults.equations.html
+++ b/devel/system/system/linearmodels.system.results.SystemResults.equations.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.equations - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults.equations - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.SystemResults.fitted_values.html b/devel/system/system/linearmodels.system.results.SystemResults.fitted_values.html
index f5461b3429..9e20ad7cac 100644
--- a/devel/system/system/linearmodels.system.results.SystemResults.fitted_values.html
+++ b/devel/system/system/linearmodels.system.results.SystemResults.fitted_values.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.fitted_values - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults.fitted_values - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.SystemResults.html b/devel/system/system/linearmodels.system.results.SystemResults.html
index 0c12be01c0..66affb2940 100644
--- a/devel/system/system/linearmodels.system.results.SystemResults.html
+++ b/devel/system/system/linearmodels.system.results.SystemResults.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.SystemResults.iterations.html b/devel/system/system/linearmodels.system.results.SystemResults.iterations.html
index 2a27b07645..fb61cc93aa 100644
--- a/devel/system/system/linearmodels.system.results.SystemResults.iterations.html
+++ b/devel/system/system/linearmodels.system.results.SystemResults.iterations.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.iterations - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults.iterations - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.SystemResults.likelihood_ratio.html b/devel/system/system/linearmodels.system.results.SystemResults.likelihood_ratio.html
index b24cc46a2a..1eafac6a59 100644
--- a/devel/system/system/linearmodels.system.results.SystemResults.likelihood_ratio.html
+++ b/devel/system/system/linearmodels.system.results.SystemResults.likelihood_ratio.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.likelihood_ratio - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults.likelihood_ratio - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.SystemResults.method.html b/devel/system/system/linearmodels.system.results.SystemResults.method.html
index ba8e1ebf7f..ee58b574a0 100644
--- a/devel/system/system/linearmodels.system.results.SystemResults.method.html
+++ b/devel/system/system/linearmodels.system.results.SystemResults.method.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.method - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults.method - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/system/system/linearmodels.system.results.SystemResults.model.html b/devel/system/system/linearmodels.system.results.SystemResults.model.html
index a7482f3afa..1f7bed0bdd 100644
--- a/devel/system/system/linearmodels.system.results.SystemResults.model.html
+++ b/devel/system/system/linearmodels.system.results.SystemResults.model.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.model - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults.model - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/system/system/linearmodels.system.results.SystemResults.model_ss.html b/devel/system/system/linearmodels.system.results.SystemResults.model_ss.html
index c23fe41a76..1080b0622f 100644
--- a/devel/system/system/linearmodels.system.results.SystemResults.model_ss.html
+++ b/devel/system/system/linearmodels.system.results.SystemResults.model_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.model_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults.model_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/system/system/linearmodels.system.results.SystemResults.nobs.html b/devel/system/system/linearmodels.system.results.SystemResults.nobs.html
index 0fcdc43e13..547c2e4cc3 100644
--- a/devel/system/system/linearmodels.system.results.SystemResults.nobs.html
+++ b/devel/system/system/linearmodels.system.results.SystemResults.nobs.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.nobs - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults.nobs - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.SystemResults.params.html b/devel/system/system/linearmodels.system.results.SystemResults.params.html
index 1b7cf8865f..78dd4b1b4b 100644
--- a/devel/system/system/linearmodels.system.results.SystemResults.params.html
+++ b/devel/system/system/linearmodels.system.results.SystemResults.params.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.params - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults.params - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.SystemResults.predict.html b/devel/system/system/linearmodels.system.results.SystemResults.predict.html
index 5061fd9567..ef8012bd64 100644
--- a/devel/system/system/linearmodels.system.results.SystemResults.predict.html
+++ b/devel/system/system/linearmodels.system.results.SystemResults.predict.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.predict - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults.predict - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.SystemResults.pvalues.html b/devel/system/system/linearmodels.system.results.SystemResults.pvalues.html
index b207e23db6..bdbbe31b78 100644
--- a/devel/system/system/linearmodels.system.results.SystemResults.pvalues.html
+++ b/devel/system/system/linearmodels.system.results.SystemResults.pvalues.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.pvalues - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults.pvalues - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.SystemResults.resid_ss.html b/devel/system/system/linearmodels.system.results.SystemResults.resid_ss.html
index 573636e68d..0c50c337b4 100644
--- a/devel/system/system/linearmodels.system.results.SystemResults.resid_ss.html
+++ b/devel/system/system/linearmodels.system.results.SystemResults.resid_ss.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.resid_ss - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults.resid_ss - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.SystemResults.resids.html b/devel/system/system/linearmodels.system.results.SystemResults.resids.html
index f75d22ff24..22db69cde7 100644
--- a/devel/system/system/linearmodels.system.results.SystemResults.resids.html
+++ b/devel/system/system/linearmodels.system.results.SystemResults.resids.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.resids - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults.resids - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.SystemResults.rsquared.html b/devel/system/system/linearmodels.system.results.SystemResults.rsquared.html
index df5b2e1143..b26a4451f3 100644
--- a/devel/system/system/linearmodels.system.results.SystemResults.rsquared.html
+++ b/devel/system/system/linearmodels.system.results.SystemResults.rsquared.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.rsquared - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults.rsquared - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/system/system/linearmodels.system.results.SystemResults.sigma.html b/devel/system/system/linearmodels.system.results.SystemResults.sigma.html
index 6ec39df1fc..459d1c0423 100644
--- a/devel/system/system/linearmodels.system.results.SystemResults.sigma.html
+++ b/devel/system/system/linearmodels.system.results.SystemResults.sigma.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.sigma - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults.sigma - linearmodels v6.1 (+15)</title>
       
     
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.std_errors - linearmodels v6.1 (+13)</title>
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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--- a/devel/system/system/linearmodels.system.results.SystemResults.summary.html
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.system.results.SystemResults.summary - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.system.results.SystemResults.summary - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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--- a/devel/system/system/linearmodels.system.results.SystemResults.system_rsquared.html
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.system.results.SystemResults.system_rsquared - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/system/system/linearmodels.system.results.SystemResults.total_ss.html b/devel/system/system/linearmodels.system.results.SystemResults.total_ss.html
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@@ -15,7 +15,7 @@
     
   
       
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/system/system/linearmodels.system.results.SystemResults.tstats.html b/devel/system/system/linearmodels.system.results.SystemResults.tstats.html
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/system/system/linearmodels.system.results.SystemResults.wresids.html b/devel/system/system/linearmodels.system.results.SystemResults.wresids.html
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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-    <a href="../../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/types.html b/devel/types.html
index 83fb3b36db..a810121382 100644
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@@ -88,7 +88,7 @@
 
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@@ -98,7 +98,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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-    <a href="index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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index 27f04270a9..a078ee2fc6 100644
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@@ -93,7 +93,7 @@
 
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-    <a href="index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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-        <title>linearmodels.shared.covariance.cov_cluster - linearmodels v6.1 (+13)</title>
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@@ -93,7 +93,7 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.shared.covariance.group_debias_coefficient - linearmodels v6.1 (+15)</title>
       
     
 
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+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.shared.hypotheses.InvalidTestStatistic.critical_values - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.shared.hypotheses.InvalidTestStatistic.critical_values - linearmodels v6.1 (+15)</title>
       
     
 
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+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
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@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.shared.hypotheses.WaldTestStatistic.critical_values - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/utility/linearmodels.shared.hypotheses.WaldTestStatistic.html b/devel/utility/linearmodels.shared.hypotheses.WaldTestStatistic.html
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+        <title>linearmodels.shared.hypotheses.WaldTestStatistic - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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+    linearmodels v6.1 (+15)
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@@ -93,7 +93,7 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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+    linearmodels v6.1 (+15)
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@@ -15,7 +15,7 @@
     
   
       
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+        <title>linearmodels.shared.hypotheses.WaldTestStatistic.pval - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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+    linearmodels v6.1 (+15)
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diff --git a/devel/utility/linearmodels.shared.hypotheses.WaldTestStatistic.stat.html b/devel/utility/linearmodels.shared.hypotheses.WaldTestStatistic.stat.html
index be800d717b..1172030f1b 100644
--- a/devel/utility/linearmodels.shared.hypotheses.WaldTestStatistic.stat.html
+++ b/devel/utility/linearmodels.shared.hypotheses.WaldTestStatistic.stat.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.shared.hypotheses.WaldTestStatistic.stat - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.shared.hypotheses.WaldTestStatistic.stat - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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index e43fc6068d..1356b954e0 100644
--- a/devel/utility/linearmodels.shared.utility.AttrDict.clear.html
+++ b/devel/utility/linearmodels.shared.utility.AttrDict.clear.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.shared.utility.AttrDict.clear - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.shared.utility.AttrDict.clear - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
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@@ -103,7 +103,7 @@
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-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/utility/linearmodels.shared.utility.AttrDict.copy.html b/devel/utility/linearmodels.shared.utility.AttrDict.copy.html
index 7d990509c3..f0004e95e6 100644
--- a/devel/utility/linearmodels.shared.utility.AttrDict.copy.html
+++ b/devel/utility/linearmodels.shared.utility.AttrDict.copy.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.shared.utility.AttrDict.copy - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.shared.utility.AttrDict.copy - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
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         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/utility/linearmodels.shared.utility.AttrDict.get.html b/devel/utility/linearmodels.shared.utility.AttrDict.get.html
index d4bb6b5e82..081c7fa2fe 100644
--- a/devel/utility/linearmodels.shared.utility.AttrDict.get.html
+++ b/devel/utility/linearmodels.shared.utility.AttrDict.get.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.shared.utility.AttrDict.get - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.shared.utility.AttrDict.get - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
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     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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diff --git a/devel/utility/linearmodels.shared.utility.AttrDict.html b/devel/utility/linearmodels.shared.utility.AttrDict.html
index 845ab4c7c5..a7437510cf 100644
--- a/devel/utility/linearmodels.shared.utility.AttrDict.html
+++ b/devel/utility/linearmodels.shared.utility.AttrDict.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.shared.utility.AttrDict - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.shared.utility.AttrDict - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/utility/linearmodels.shared.utility.AttrDict.items.html b/devel/utility/linearmodels.shared.utility.AttrDict.items.html
index 56dc87168e..32e441bb59 100644
--- a/devel/utility/linearmodels.shared.utility.AttrDict.items.html
+++ b/devel/utility/linearmodels.shared.utility.AttrDict.items.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.shared.utility.AttrDict.items - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.shared.utility.AttrDict.items - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
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-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
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-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/utility/linearmodels.shared.utility.AttrDict.keys.html b/devel/utility/linearmodels.shared.utility.AttrDict.keys.html
index 3622801b7f..ad4e80a5ac 100644
--- a/devel/utility/linearmodels.shared.utility.AttrDict.keys.html
+++ b/devel/utility/linearmodels.shared.utility.AttrDict.keys.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.shared.utility.AttrDict.keys - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.shared.utility.AttrDict.keys - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
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         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/utility/linearmodels.shared.utility.AttrDict.pop.html b/devel/utility/linearmodels.shared.utility.AttrDict.pop.html
index 7b26462370..33df38a1ce 100644
--- a/devel/utility/linearmodels.shared.utility.AttrDict.pop.html
+++ b/devel/utility/linearmodels.shared.utility.AttrDict.pop.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.shared.utility.AttrDict.pop - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.shared.utility.AttrDict.pop - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
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     <div class="md-nav__source">
diff --git a/devel/utility/linearmodels.shared.utility.AttrDict.popitem.html b/devel/utility/linearmodels.shared.utility.AttrDict.popitem.html
index 6a48075256..ad29560b5c 100644
--- a/devel/utility/linearmodels.shared.utility.AttrDict.popitem.html
+++ b/devel/utility/linearmodels.shared.utility.AttrDict.popitem.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.shared.utility.AttrDict.popitem - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.shared.utility.AttrDict.popitem - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
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   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/utility/linearmodels.shared.utility.AttrDict.setdefault.html b/devel/utility/linearmodels.shared.utility.AttrDict.setdefault.html
index 8b80a4cb72..fc93fceed5 100644
--- a/devel/utility/linearmodels.shared.utility.AttrDict.setdefault.html
+++ b/devel/utility/linearmodels.shared.utility.AttrDict.setdefault.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.shared.utility.AttrDict.setdefault - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.shared.utility.AttrDict.setdefault - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/utility/linearmodels.shared.utility.AttrDict.update.html b/devel/utility/linearmodels.shared.utility.AttrDict.update.html
index 807763243f..386d5f24fc 100644
--- a/devel/utility/linearmodels.shared.utility.AttrDict.update.html
+++ b/devel/utility/linearmodels.shared.utility.AttrDict.update.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.shared.utility.AttrDict.update - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.shared.utility.AttrDict.update - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">
diff --git a/devel/utility/linearmodels.shared.utility.AttrDict.values.html b/devel/utility/linearmodels.shared.utility.AttrDict.values.html
index 589057a1a4..a9d857b73c 100644
--- a/devel/utility/linearmodels.shared.utility.AttrDict.values.html
+++ b/devel/utility/linearmodels.shared.utility.AttrDict.values.html
@@ -15,7 +15,7 @@
     
   
       
-        <title>linearmodels.shared.utility.AttrDict.values - linearmodels v6.1 (+13)</title>
+        <title>linearmodels.shared.utility.AttrDict.values - linearmodels v6.1 (+15)</title>
       
     
 
@@ -93,7 +93,7 @@
 
 <header class="md-header" data-md-component="header">
   <nav class="md-header__inner md-grid" aria-label="Header">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-header__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
     <label class="md-header__button md-icon" for="__drawer">
@@ -103,7 +103,7 @@
       <div class="md-header__ellipsis">
         <div class="md-header__topic">
           <span class="md-ellipsis">
-            linearmodels v6.1 (+13)
+            linearmodels v6.1 (+15)
           </span>
         </div>
         <div class="md-header__topic" data-md-component="header-topic">
@@ -190,10 +190,10 @@
 
 <nav class="md-nav md-nav--primary" aria-label="Navigation" data-md-level="0">
   <label class="md-nav__title" for="__drawer">
-    <a href="../index.html" title="linearmodels v6.1 (+13)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+13)" data-md-component="logo">
+    <a href="../index.html" title="linearmodels v6.1 (+15)" class="md-nav__button md-logo" aria-label="linearmodels v6.1 (+15)" data-md-component="logo">
       <img src="../_static/bw-logo.svg" alt="logo">
     </a>
-    linearmodels v6.1 (+13)
+    linearmodels v6.1 (+15)
   </label>
   
     <div class="md-nav__source">