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Update settinguptheanalysis.md
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Fix error in warning box
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nucleosynthesis authored Nov 1, 2023
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Expand Up @@ -206,7 +206,7 @@ or just attach a postifx to the name of the histogram
`shapes * * shapes.root $CHANNEL/$PROCESS $CHANNEL/$PROCESS_$SYSTEMATIC`

!!! warning
If you have a nuisance parameter which has shape effects (using `shape`) *and* rate effects (using `lnN`) you should use a single line for the systemstic uncertainty with `shape?`. This will tell combine to fist look for Up/Down systematic templates for that process and if it doesnt find them, it will interpret the number that you put for the process as a `lnN` instead.
If you have a nuisance parameter which has shape effects (using `shape`) *and* rate effects (using `lnN`) you should use a single line for the systemstic uncertainty with `shape?`. This will tell combine to fist look for Up/Down systematic templates for that process and if it doesnt find them, it will interpret the number that you put for the process as a `lnN` instead.

For a detailed example of a template based binned analysis see the [H→ττ 2014 DAS tutorial](https://twiki.cern.ch/twiki/bin/viewauth/CMS/SWGuideCMSDataAnalysisSchool2014HiggsCombPropertiesExercise#A_shape_analysis_using_templates)

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