Provide choice of fitting cost function beyond Chi2 (Trac #465)

[butlerpd]

Megan Robertson's group from the Universtiy of Houston has indicated the need to use alternate cost functions to the current Chi^2^. This relates mostly to having features in different q ranges that are not always captured if the uncertainties vary widely between q ranges. One should be careful in doing this of course. On the other hand it is clear that if we are ever to have successful co-refinement of SAXS and SANS we will need to do something. Most likely in fact weighting cost function differently for different curves?

Migrated from http://trac.sasview.org/ticket/465

{
    "status": "new",
    "changetime": "2016-03-20T22:47:52",
    "_ts": "2016-03-20 22:47:52.027781+00:00",
    "description": "Megan Robertson's group from the Universtiy of Houston has indicated the need to use alternate cost functions to the current Chi^2^.  This relates mostly to having features in different q ranges that are not always captured if the uncertainties vary widely between q ranges.  One should be careful in doing this of course.  On the other hand it is clear that if we are ever to have successful co-refinement of SAXS and SANS we will need to do something.  Most likely in fact weighting cost function differently for different curves?",
    "reporter": "butler",
    "cc": "",
    "resolution": "",
    "workpackage": "SasView Fitting Redesign",
    "time": "2015-10-17T19:50:24",
    "component": "SasView",
    "summary": "Provide choice of fitting cost function beyond Chi2",
    "priority": "major",
    "keywords": "",
    "milestone": "SasView Next Release +1",
    "owner": "",
    "type": "enhancement"
}

[butlerpd]

Trac update at 2016/03/20 22:47:52:

• butler changed description from "Megan Robertson's group from the Universtiy of Houston has indicated the need to use alternate cost functions to the current Chi^2. This relates mostly to having features in different q ranges that are not always captured if the uncertainties vary widely between q ranges. One should be careful in doing this of course. On the other hand it is clear that if we are ever to have successful co-refinement of SAXS and SANS we will need to do something. Most likely in fact weighting cost function differently for different curves?" to "Megan Robertson's group from the Universtiy of Houston has indicated the need to use alternate cost functions to the current Chi^2^. This relates mostly to having features in different q ranges that are not always captured if the uncertainties vary widely between q ranges. One should be careful in doing this of course. On the other hand it is clear that if we are ever to have successful co-refinement of SAXS and SANS we will need to do something. Most likely in fact weighting cost function differently for different curves?"
• butler changed milestone from "SasView 4.0.0" to "SasView Next Release +1"