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#include "RooPlot.h"
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#include "RooRandom.h"
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#include "RooRealVar.h"
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#include "RooGaussian.h"
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#include "RooPolynomial.h"
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#include "RooArgSet.h"
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#include "RooAddPdf.h"
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#include "RooDataSet.h"
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#include "RooExtendPdf.h"
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#include "RooConstVar.h"
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#ifndef __CINT__ // problem including this file with CINT
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#include "RooGlobalFunc.h"
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#endif
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#include "RooStats/FeldmanCousins.h"
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#include "RooStats/PointSetInterval.h"
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#include "RooStats/ProfileLikelihoodCalculator.h"
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#include "RooStats/LikelihoodIntervalPlot.h"
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#include "TCanvas.h"
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#include "TH1F.h"
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#include "TFile.h"
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#include "TChain.h"
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#include "RooWorkspace.h"
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#include "RooDataHist.h"
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//#include "./_tdrstyle.C"
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void stat(int ntoys = 10000){
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using namespace RooFit;
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using namespace RooStats;
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// setTDRStyle();
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RooRandom::randomGenerator()->SetSeed(10);
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// Create a workspace to manage the project.
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RooWorkspace* wspace = new RooWorkspace("myWS");
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// qT observable and its the range:
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wspace->factory("qT[30.0, 1200.0]");
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// Luminosity:
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wspace->factory("luminosity[35., 25., 45.]"); // Expect to accumulate up to 30/pb in 2010
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// wspace->factory("Gaussian::prior_lumi(luminosity, 10.9, 0.05)"); // Assume 5% gaussian uncertainty for the luminosity
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// Drell-Yan cross section:
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wspace->factory("dy_xsec[1737.9, 1500, 2000]"); // NNLO Drell-Yan cross section given by FEWZz with m>20 (in pb)
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// wspace->factory("Gaussian::prior_dy_xsec(dy_xsec, 1.7379, 0.0168)"); // see https://alcaraz.web.cern.ch/alcaraz/CROSS_SECTIONS.txt for details
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// Drell-Yan acceptance:
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wspace->factory("dy_acceptance[0.235, 0.0, 1.0]"); // Assuming 60<m<120 && VBTF selection
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// wspace->factory("Gaussian::prior_dy_acc(dy_acceptance, 0.235, 0.00025)"); // Accuracy's estimate for an acceptance (difference between accTrue and accSim)
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// Fraction of Drell-Yan in qT>30 range:
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wspace->factory("dy_qTcut[0.166, 0.0, 1.0]"); // Number of Drell-Yan events with in the spectrum
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// wspace->factory("Gaussian::prior_dy_qTcut(dy_qTcut, 0.166, 0.0001)"); // Accuracy's estimate for an acceptance (out of the blue)
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// Net Drell-Yan yield:
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wspace->factory("prod::dy_yield(luminosity, dy_xsec, dy_acceptance, dy_qTcut)");
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// Make a simple model of Drell-Yan background
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wspace->factory("dy_slope[0.64, 0.6, 0.8]");
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// wspace->factory("Gaussian::prior_dy_slope(dy_slope, 0.64, 0.05)"); // I'll have to come up with something better here
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wspace->factory("CEXPR::background('exp(-sqrt(qT)*dy_slope)', qT, dy_slope)");
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// Make a simple model of signal (no uncertainties here)
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// wspace->factory("CEXPR::signal('4.38397e-01/14.55/(7.43366e-01 + exp(4.51335e-02*(qT-7.08881e+02)) + 2.27385e-04*(qT-8.47767e+02)*(qT-8.47767e+02))', qT)"); // Z' m=1500 GeV/c/c
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// wspace->factory("CEXPR::signal('4.92212e+02/14.5/(-3.04459e+05 + exp(3.80391e-02*(qT-7.55088e+02)) + 9.11595e-03*(qT-6.81130e+03)*(qT-6.81130e+03))', qT)"); // Z' m=2000 GeV/c/c
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wspace->factory("CEXPR::signal('343989./(2435.4 + exp(-0.008824*(qT-234.877)) + 0.087526879*(qT-234.877)*(qT-234.877))', qT)"); //ci05
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wspace->factory("CEXPR::signal('1714311/(13545.8+ exp(-0.034854*(qT-401.749)) + 0.484819424*(qT-401.749)*(qT-401.749))', qT)"); //ci10
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wspace->factory("CEXPR::signal('783571./(8064.4 + exp(-0.024829*(qT-558.958)) + 0.208610709*(qT-558.958)*(qT-558.958))', qT)"); //ci15
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wspace->factory("CEXPR::signal('10.8808/(-0.102 + exp( 0.019262*(qT-366.378)) + 3.11203e-06*(qT-366.378)*(qT-366.378))', qT)"); //gi05
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wspace->factory("CEXPR::signal('878.946/(2.7015 + exp( 0.021975*(qT-459.043)) + 2.58958e-04*(qT-459.043)*(qT-459.043))', qT)"); //gi10
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wspace->factory("CEXPR::signal('1819.48/(12.188 + exp( 0.015487*(qT-639.073)) + 4.15408e-04*(qT-639.073)*(qT-639.073))', qT)"); //gi15
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wspace->factory("CEXPR::signal('296.407/(2.6339 + exp( 0.06652 *(qT-220.041)) + 2.17778e-03*(qT-220.041)*(qT-220.041))', qT)"); //zp05
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wspace->factory("CEXPR::signal('611.231/(3.6656 + exp( 0.030314*(qT-468.111)) + 6.99505e-04*(qT-468.111)*(qT-468.111))', qT)"); //zp10
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wspace->factory("CEXPR::signal('567.34 /(10.927 + exp( 0.02028 *(qT-687.772)) + 5.33170e-04*(qT-687.772)*(qT-687.772))', qT)"); //zp15
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// Put signal and background together
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wspace->factory("SUM::model(sig_yield[0,0,10]*signal, dy_yield*background)");
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// Background only model
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wspace->factory("ExtendPdf::null(background, dy_yield)");
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RooAbsPdf* model = wspace->pdf("model");
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RooAbsPdf* null = wspace->pdf("null");
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RooRealVar* sig_yield = wspace->var("sig_yield");
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RooRealVar* luminosity = wspace->var("luminosity");
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//luminosity->setConstant();
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RooRealVar* dy_xsec = wspace->var("dy_xsec");
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dy_xsec->setConstant();
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RooRealVar* dy_acceptance = wspace->var("dy_acceptance");
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dy_acceptance->setConstant();
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RooRealVar* dy_qTcut = wspace->var("dy_qTcut");
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dy_qTcut->setConstant();
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RooRealVar* dy_slope = wspace->var("dy_slope");
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//dy_slope->setConstant();
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// RooArgList observable( *(wspace->var("qT")) );
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ModelConfig modelConfig("sigBg");
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modelConfig.SetWorkspace(*wspace);
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modelConfig.SetPdf(*model);
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RooArgSet POI(*sig_yield);
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modelConfig.SetParameters(POI);
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// modelConfig.SetObservables(observable);
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wspace->Print();
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//wspace->writeToFile("myWS.root");
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RooRealVar* qT = wspace->var("qT");
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// Pseudo data:
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// RooDataSet* data = model->generate(*qT,);
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// RooDataSet* data = null->generate(*qT,RooFit::Extended());
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// Real data:
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TFile *qTdata = new TFile("boostedZnew.root");
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TTree *skim = (TTree*)qTdata->Get("skim");
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// TChain *dataTree = new TChain("tree");
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// dataTree->AddFile("../11pb/dimuons_merged_6860InvNb_nocosmics.root");
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// dataTree->AddFile("../11pb/dimuons_Run2010B_PromptReco_v2_run147117to147454.root");
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RooArgSet vars(*qT);
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// RooDataSet* data = new RooDataSet("recoCandPt","recoCandPt",dataTree,vars,"recoCandMass>60 && recoCandMass<120");
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RooDataSet* data = new RooDataSet("qTdata","qTdata",skim,vars);
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/*
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TCanvas *q = new TCanvas();
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RooPlot* frame = qT->frame();
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data->plotOn(frame);
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model->plotOn(frame);
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frame->Draw();
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return;
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*/
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/*
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// Set up the ProfileLikelihoodCalculator
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ProfileLikelihoodCalculator plc(*data, *model, POI);
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// ProfileLikelihoodCalculator usually make intervals: the 95% CL one-sided upper-limit is the same as the two-sided upper-limit of a 90% CL interval
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plc.SetTestSize(0.10);
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// Pointer to the confidence interval
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model->fitTo(*data,SumW2Error(kFALSE)); // <-- problem
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LikelihoodInterval* plcInterval = plc.GetInterval();
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// Compute the upper limit: a fit is needed first in order to locate the minimum of the -log(likelihood) and ease the upper limit computation
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model->fitTo(*data,SumW2Error(kFALSE)); // <-- problem
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const double upperLimit = plcInterval->UpperLimit(*sig_yield); // <-- to simplify
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// Make a plot of the profile-likelihood and confidence interval
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LikelihoodIntervalPlot plot(plcInterval);
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plot.Draw();
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std::cout << "One sided upper limit at 95% CL: "<< upperLimit << std::endl;
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return;
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*/
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RooStats::FeldmanCousins fc(*data,modelConfig);
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fc.AdditionalNToysFactor(10);
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fc.CreateConfBelt(true);
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fc.SaveBeltToFile(true);
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fc.SetTestSize(.05); // set size of test
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fc.UseAdaptiveSampling(true);
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fc.FluctuateNumDataEntries(true); // number counting analysis: dataset always has 1 entry with N events observed
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fc.SetNBins(100); // number of points to test per parameter
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// use the Feldman-Cousins tool
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PointSetInterval* interval = (PointSetInterval*)fc.GetInterval();
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std::cout << "is this point in the interval? " <<
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interval->IsInInterval(RooArgSet(*sig_yield)) << std::endl;
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std::cout << "interval is ["<<
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interval->LowerLimit(*sig_yield) << ", " <<
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interval->UpperLimit(*sig_yield) << "]" << endl;
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}
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