void twoChannels()
{
// ---- set style and open log files ---- //
// open log file
BCLog::OpenLog("log.txt");
BCLog::SetLogLevel(BCLog::detail);
// set nicer style for drawing than the ROOT default
BCAux::SetStyle();
// ---- read histograms from a file ---- //
// open file
std::string fname = "templates.root";
TFile * file = TFile::Open(fname.c_str(), "READ");
// check if file is open
if (!file->IsOpen()) {
BCLog::OutError(Form("Could not open file %s.",fname.c_str()));
BCLog::OutError("Run macro CreateHistograms.C in Root to create the file.");
return;
}
// read histograms
TH1D hist_bkg1 = *(TH1D *)file->Get("hist_bkg1"); // background template for channel 1
TH1D hist_bkg2 = *(TH1D *)file->Get("hist_bkg2"); // background template for channel 2
TH1D hist_sgn1 = *(TH1D *)file->Get("hist_sgn1"); // signal template for channel 1
TH1D hist_sgn2 = *(TH1D *)file->Get("hist_sgn2"); // signal template for channel 2
TH1D hist_data1 = *(TH1D *)file->Get("hist_data1"); // data for channel 1
TH1D hist_data2 = *(TH1D *)file->Get("hist_data2"); // data for channel 2
// ---- perform fitting ---- //
// create new fitter object
BCMTF * m = new BCMTF();
// add channels
m->AddChannel("channel1");
m->AddChannel("channel2");
// add processes
m->AddProcess("background_channel1", 700., 900.);
m->AddProcess("background_channel2", 300., 700.);
m->AddProcess("signal", 0., 400.);
// set data
m->SetData("channel1", hist_data1);
m->SetData("channel2", hist_data2);
// set template and histograms
// note: the process "background_channel2" is ignored in channel 1
m->SetTemplate("channel1", "signal", hist_sgn1, 0.5);
m->SetTemplate("channel1", "background_channel1", hist_bkg1, 1.0);
// note: the process "background_channel1" is ignored in channel 2
m->SetTemplate("channel2", "signal", hist_sgn2, 1.0);
m->SetTemplate("channel2", "background_channel2", hist_bkg2, 1.0);
// set priors
m->SetPriorGauss("background_channel1", 800., 10.);
m->SetPriorGauss("background_channel2", 500., 50.);
m->SetPriorConstant("signal");
// marginalize
m->MarginalizeAll();
// find global mode
m->FindMode( m->GetBestFitParameters() );
// print all marginalized distributions
m->PrintAllMarginalized("marginalized.pdf");
// print results of the analysis into a text file
m->PrintResults("results.txt");
// print templates and stacks
for (int i = 0; i < m->GetNChannels(); ++i) {
BCMTFChannel * channel = m->GetChannel(i);
channel->PrintTemplates(Form("%s_templates.pdf", channel->GetName().c_str()));
m->PrintStack(i, m->GetBestFitParameters(), Form("%s_stack.pdf", channel->GetName().c_str()));
}
// ---- clean up ---- //
// free memory
delete m;
}
void ensembleTest()
{
// ---- set style and open log files ---- //
// open log file
BCLog::OpenLog("log.txt");
BCLog::SetLogLevel(BCLog::detail);
// set nicer style for drawing than the ROOT default
BCAux::SetStyle();
// ---- read histograms from a file ---- //
// open file
std::string fname = "templates.root";
TFile * file = TFile::Open(fname.c_str(), "READ");
// check if file is open
if (!file->IsOpen()) {
BCLog::OutError(Form("Could not open file %s.",fname.c_str()));
BCLog::OutError("Run macro CreateHistograms.C in Root to create the file.");
return;
}
// read histograms
TH1D hist_bkg1 = *(TH1D *)file->Get("hist_bkg1"); // background template for channel 1
TH1D hist_bkg2 = *(TH1D *)file->Get("hist_bkg2"); // background template for channel 2
TH1D hist_sgn1 = *(TH1D *)file->Get("hist_sgn1"); // signal template for channel 1
TH1D hist_sgn2 = *(TH1D *)file->Get("hist_sgn2"); // signal template for channel 2
TH1D hist_data1 = *(TH1D *)file->Get("hist_data1"); // data for channel 1
TH1D hist_data2 = *(TH1D *)file->Get("hist_data2"); // data for channel 2
// ---- perform fitting ---- //
// create new fitter object
BCMTF * m = new BCMTF("MyModel");
// set Metropolis as marginalization method
m->SetMarginalizationMethod(BCIntegrate::kMargMetropolis);
// set the required precision of the MCMC (kLow, kMedium, kHigh)
// the higher the precision the longer the MCMC run
m->MCMCSetPrecision(BCEngineMCMC::kMedium);
// add channels
m->AddChannel("channel1");
m->AddChannel("channel2");
// add processes
m->AddProcess("background_channel1", 700., 900.);
m->AddProcess("background_channel2", 300., 700.);
m->AddProcess("signal", 0., 400.);
// set data
m->SetData("channel1", hist_data1);
m->SetData("channel2", hist_data2);
// set template and histograms
// note: the process "background_channel2" is ignored in channel 1
m->SetTemplate("channel1", "signal", hist_sgn1, 0.5);
m->SetTemplate("channel1", "background_channel1", hist_bkg1, 1.0);
// m->SetTemplate("channel1", "background_channel2", hist_bkg1, 0.0);
// note: the process "background_channel1" is ignored in channel 2
m->SetTemplate("channel2", "signal", hist_sgn2, 1.0);
m->SetTemplate("channel2", "background_channel2", hist_bkg2, 1.0);
// m->SetTemplate("channel2", "background_channel1", hist_bkg2, 0.0);
// set priors
m->SetPriorGauss("background_channel1", 800., 10.);
m->SetPriorGauss("background_channel2", 500., 50.);
m->SetPriorConstant("signal");
// run MCMC
m->MarginalizeAll();
// find global mode
m->FindMode( m->GetBestFitParameters() );
// print all marginalized distributions
m->PrintAllMarginalized("marginalized.pdf");
// print results of the analysis into a text file
m->PrintResults("results.txt");
// print templates and stacks
for (int i = 0; i < m->GetNChannels(); ++i) {
BCMTFChannel * channel = m->GetChannel(i);
channel->PrintTemplates(Form("%s_templates.pdf", channel->GetName().c_str()));
m->PrintStack(i, m->GetBestFitParameters(), Form("%s_stack.pdf", channel->GetName().c_str()));
}
// ---- perform ensemble tests ---- //
// create new analysis facility
BCMTFAnalysisFacility * facility = new BCMTFAnalysisFacility(m);
// settings
facility->SetFlagMarginalize(false);
// facility->SetFlagMarginalize(true);
// open new file
file = TFile::Open("ensembles.root", "RECREATE");
file->cd();
// create ensembles
TTree * tree = facility->BuildEnsembles( m->GetBestFitParameters(), 2000 );
// run ensemble test
TTree * tree_out = facility->PerformEnsembleTest(tree, 2000);
// write trees into file
tree->Write();
tree_out->Write();
// close file
file->Close();
// free memory
delete file;
// ---- clean up ---- //
// free memory
delete m;
}