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[RF] Documentation improvement for createNLL constants #22619
Description
For absolute-NLL comparisons: quickFit/RooFit NLLs include data-only constants (e.g. the -log N! of the extended term and constraint normalization constants) that are not part of the serialized model. A short statement in the RooFitHS3 docs of which constants RooFit's createNLL includes would make cross-tool validation much less archaeological.
Activity
kratsg commentedon Jun 15, 2026
From @guitargeek
guitargeek commentedon Aug 3, 2026
I didn't get to work on this yet, but just a side note so I don't forget: I also need to clearly document the math of chi2 and (multi-)ranged fit semantics, which can be quite confusing, as seen in this PR for example: