RooFit:Why I cant display the stat box on the canvas?

Roofit and RooStats
1

Dear experts,
I want to know that why I cant show the stat box on canvas？

    model.fitTo(data);
    RooPlot *frame = x.frame();
    data.plotOn(frame,RooFit::DataError(RooAbsData::None), RooFit::DrawOption("None"));
    model.plotOn(frame);
    gStyle->SetOptStat("emr");
    gStyle->SetOptFit(1111);
    frame->Draw();
    hsum->SetStats(1);
    gaus1->SetLineColor(kRed);
    gaus1->Draw("same");
    gaus2->SetLineColor(kBlue);
    gaus2->Draw("same");
    bg->SetLineColor(kGreen);
    bg->Draw("same");
    hsum->SetLineColor(kViolet);
    hsum->Draw("same");
    c->SaveAs("RooFit.png");
}
2

Hello,

Thanks for the post and welcome to the ROOT Community!

I would propose to have a look to this tutorial that shows how to decorate a RooFit plot.

Don’t hesitate to come back with questions if that’s not enough to unblock you!

Cheers,
Danilo

4

Thank you very much.
I read his tutorial and know that seems I have to use .statOn and .paramOn to do something like SetOptStat and SetOptFit can do.
But It seems that in RooFit I can’t use the code like SetOptFit(1111) to display the stat like chisquare/ndf and so on (ps:the .statOn can induct the parameter like “What(“nemr”)”,but .paramOn cant induct “What(1111)” .
So Do I have to calculate the Statistics by myself and put them on the canvas in text?