ln(L) is the full range is not equal ln(Lr1) +ln(L(s)+ln(Lr2)

Roofit and RooStats
3

Hi @anikiten!

Two questions first:

Which ROOT version are you using? I think this was a problem a few versions ago but I fixed it in the meantime. See the release notes for ROOT 6.26. However, since you are apparently using a very old CMSSW release, you don’t benefit from the fix :frowning: I know there is some effort to make combine work with ROOT 6.26, can you maybe do that?

Are you fitting a RooDataSet or a RooDataHist?

Cheers,
Jonas