I’m fitting to a sub-range of a histogram. Do I need to tell chiSquare what sub-range I’m using?
This is what I’m doing now:Double_t chi2 = framex->chiSquare("curvetot","Hist",floatpars);The PDF is “curvetot” and the data is “Hist”, with a number of non-constant parameters = “floatpars”.
More detail, for reference:
RooRealVar *mass = new RooRealVar("mass","m(#Lambda_{b})",5619.51,"MeV");
RooDataHist *data = new RooDataHist("data","1D",RooArgList(*mass),h100);
...
RooAbsReal * nll = totalPdf.createNLL(*data,Extended(kTRUE),Range(4300,5950));
...
RooPlot *framex = mass->frame();
data->plotOn(framex,Name("Hist"),MarkerColor(kBlack),LineColor(kBlack),DataError(RooAbsData::SumW2));
totalPdf.plotOn(framex,Name("curvetot"),LineColor(kBlue));
...
RooArgSet *floatpar = totalPdf.getParameters(data);
int floatpars = (floatpar->selectByAttrib("Constant",kFALSE))->getSize();
Double_t chi2 = framex->chiSquare("curvetot","Hist",floatpars);