Dear Root team,
Using RooFit in ROOT 5.22, I would like to do an extended likelihood fit with MINOS to a set of data at a certain error level (yielding e.g. a 5 sigma upper and lower limit, instead of the standard 1 sigma), and given a signal + background model. How do I set the error level AND make the fit extended? At the moment, the part of my code relevant to the question looks like this:
[code] RooAddPdf *spb = new RooAddPdf(“spb”,“spb”,RooArgList(*sig,*bkg),RooArgList(*fsig,*fbkg));
double errorLevel = 5.*5.*0.5;
Is this the correct way to go? The result looks reasonable, but I can not judge whether the fit was actually extended or not, especially since I also tried a composite likelihood fit (i.e. excluding fbkg and Extended(kTRUE)) to the same data and got exactly the same result.
Many thanks in advance!