I have some questions concerning binned likelyhood and goodness of fit tests.
I know that when one performs a Binned Likelyhood Fit using ROOSTAT one can use -2 * (the minimum value of negative log-likelihood) to get information on goodness of fit (as described in S. Baker and R. D. Cousins, Nucl. Instrum. Meth. 221 (1984) 437).
I have a few questions :
-My data are imported in ROOFIT from a ROOT TH1D histogram so I guess ROOFIT is performing a binned likelyhood fit. The only thind I could find on ROOFIT is that if the data is binned a binned likelyhood is automaticaly performed. Am I correct?
- Assuming the fit is indeed a binned maximum likelyhood fit, I couldn’t find anywhere whether ROOFIT is using this Baker & Cousins prescription or not for Binned Likelyhood just like ROOSTAT does. In other words, can I use -2 * (the minimum value of negative log-likelihood) to get information on goodness of fit in ROOFIT as well?
Thanks a lot for your help.