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[RelNotes] Mention change of multi-range fit behaviour in RooFit
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@guitargeek
guitargeek committed Apr 7, 2021
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Expand Up @@ -68,6 +68,14 @@ RooFit now contains two RDataFrame action helpers, `RooDataSetHelper` and `RooDa
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For more details, consult the tutorial [rf408_RDataFrameToRooFit](https://root.cern/doc/v626/rf408__RDataFrameToRooFit_8C.html).
### Changes in `RooAbsPdf::fitTo` behaviour for multi-range fits
The `RooAbsPdf::fitTo` and `RooAbsPdf::createNLL` functions accept a command argument to specify the fit range.
One can also fit in multiple ranges simultaneously.
The definition of such multi-range likelihoods for non-extended fits changes in this release.
Previously, the individual likelihoods were normalized separately in each range, which meant that the relative number of events in each sub-range was not used to estimate the PDF parameters.
From now on, the likelihoods are normalized by the sum of integrals in each range. This implies that the likelihood takes into account all inter-range and intra-range information.
## 2D Graphics Libraries
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