Constructing a RooWorkspace from histograms

I have histograms of:

  • data
  • Monte Carlo (MC)
  • systematics.

I need to construct a RooWorkspace to conduct a Profile Likelihood Ratio (PLR) analysis. I study the example

https://root.cern.ch/root/html/tutorials/roostats/StandardProfileLikelihoodDemo.C.html

It seems to me that the line

gROOT->ProcessLine(".! hist2workspace config/example.xml");

adds automatically generated histograms to RooWorkspace, but all the details are hidden.

I have my own histograms and now need to conduct a PLR analysis. How do I start?

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