StandardProfileLikelihoodDemo.C: Standard demo of the Profile Likelihood calculcator
// Standard demo of the Profile Likelihood calculcator
/*
StandardProfileLikelihoodDemo
Author: Kyle Cranmer
date: Dec. 2010
This is a standard demo that can be used with any ROOT file
prepared in the standard way. You specify:
- name for input ROOT file
- name of workspace inside ROOT file that holds model and data
- name of ModelConfig that specifies details for calculator tools
- name of dataset
With default parameters the macro will attempt to run the
standard hist2workspace example and read the ROOT file
that it produces.
The actual heart of the demo is only about 10 lines long.
The ProfileLikelihoodCalculator is based on Wilks's theorem
and the asymptotic properties of the profile likeihood ratio
(eg. that it is chi-square distributed for the true value).
*/
#include "TFile.h"
#include "TROOT.h"
#include "TSystem.h"
#include "RooWorkspace.h"
#include "RooAbsData.h"
#include "RooRealVar.h"
#include "RooStats/ModelConfig.h"
#include "RooStats/ProfileLikelihoodCalculator.h"
#include "RooStats/LikelihoodInterval.h"
#include "RooStats/LikelihoodIntervalPlot.h"
using namespace RooFit;
using namespace RooStats;
void StandardProfileLikelihoodDemo(const char* infile = "",
const char* workspaceName = "combined",
const char* modelConfigName = "ModelConfig",
const char* dataName = "obsData"){
/////////////////////////////////////////////////////////////
// First part is just to access a user-defined file
// or create the standard example file if it doesn't exist
////////////////////////////////////////////////////////////
const char* filename = "";
if (!strcmp(infile,"")) {
filename = "results/example_combined_GaussExample_model.root";
bool fileExist = !gSystem->AccessPathName(filename); // note opposite return code
// if file does not exists generate with histfactory
if (!fileExist) {
#ifdef _WIN32
cout << "HistFactory file cannot be generated on Windows - exit" << endl;
return;
#endif
// Normally this would be run on the command line
cout <<"will run standard hist2workspace example"<<endl;
gROOT->ProcessLine(".! prepareHistFactory .");
gROOT->ProcessLine(".! hist2workspace config/example.xml");
cout <<"\n\n---------------------"<<endl;
cout <<"Done creating example input"<<endl;
cout <<"---------------------\n\n"<<endl;
}
}
else
filename = infile;
// Try to open the file
TFile *file = TFile::Open(filename);
// if input file was specified byt not found, quit
if(!file ){
cout <<"StandardRooStatsDemoMacro: Input file " << filename << " is not found" << endl;
return;
}
/////////////////////////////////////////////////////////////
// Tutorial starts here
////////////////////////////////////////////////////////////
// get the workspace out of the file
RooWorkspace* w = (RooWorkspace*) file->Get(workspaceName);
if(!w){
cout <<"workspace not found" << endl;
return;
}
// get the modelConfig out of the file
ModelConfig* mc = (ModelConfig*) w->obj(modelConfigName);
// get the modelConfig out of the file
RooAbsData* data = w->data(dataName);
// make sure ingredients are found
if(!data || !mc){
w->Print();
cout << "data or ModelConfig was not found" <<endl;
return;
}
/////////////////////////////////////////////
// create and use the ProfileLikelihoodCalculator
// to find and plot the 95% confidence interval
// on the parameter of interest as specified
// in the model config
ProfileLikelihoodCalculator pl(*data,*mc);
pl.SetConfidenceLevel(0.95); // 95% interval
LikelihoodInterval* interval = pl.GetInterval();
// print out the iterval on the first Parameter of Interest
RooRealVar* firstPOI = (RooRealVar*) mc->GetParametersOfInterest()->first();
cout << "\n95% interval on " <<firstPOI->GetName()<<" is : ["<<
interval->LowerLimit(*firstPOI) << ", "<<
interval->UpperLimit(*firstPOI) <<"] "<<endl;
// make a plot
cout << "making a plot of the profile likelihood function ....(if it is taking a lot of time use less points or the TF1 drawing option)\n";
LikelihoodIntervalPlot plot(interval);
plot.SetNPoints(50); // do not use too many points, it could become very slow for some models
plot.Draw(""); // use option TF1 if too slow (plot.Draw("tf1")
}
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