General question on rooCategories in run ranges

Hi all,
I am trying to fit data from 3 closely related experiments. Basically the same experiment taken under slightly different running conditions. The PDFs from the three running conditions will be different. Should I just do a simultaneous fit? Or is this a situation where rooCategories might be fruitfully used?

many thanks!

I’ll tell our Fitting expert about it.


RooCategory are used for tagging the data sets and are used in simultaneous fits. Yes, your case seems a typical case of a simultaneous fit, if the PD are different but share some common parameters then this is the case of a simultaneous fit

Best Regards