Fitting with finite MC statistics

Dear RooT experts,

I want to fit a data distribution with a weighted sum of MC distributions. Unfortunately in some of the MC bins the statistics is quite low and I want the fit taking those fluctuations into account. In HBOOK there have been routines like HMCMLL to cope with finite MC statistics. Is there anything similar in RooT or in one of the additional fitting packages (RooFit etc.)? So far I haven’t found anything by myself. If not I can try to incorporate it into the RooT interface to MINUIT.

Many thanks,

Hi Oliver,

see class TFractionFitter at