JTestZero_t.hh

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#ifndef __JTESTZERO_T__
#define __JTESTZERO_T__

#include <iostream>
#include "TMath.h"
#include "JTest_t.hh"
#include "Math/Math.h"
#include "Math/Error.h"
#include "Math/ProbFuncMathCore.h"
#include "Math/SpecFuncMathCore.h"

using namespace std;
/*
 * \author rgruiz
 */

/*
 * Implementation of the test for histograms with a low bin content expectation.
 */
class JTestZero_t
{ 
public:
  
  /*
   * Default constructor.
   */    
  JTestZero_t(){}

  /*
   * Tests the statistical compatibility of two ROOT TObjects
   * 
   * \param h1 First object
   * \param h2 Second object
   * \param failureThreshold Fraction of incompatible bins allowed.
   * \param threshold Poisson p-value
   */
  JTestResult JTestZero_2D(TH2* h1, TH2* h2, double outliersThreshold, double threshold) {    
      
    int nx1 = h1->GetNbinsX();
    int nx2 = h2->GetNbinsX();      
    int ny1 = h1->GetNbinsY();
    int ny2 = h2->GetNbinsY();

    if(nx1 != nx2 || ny1 != ny2)
      ERROR("Histograms with different binning. The objects: " << h1->GetName() << " can not be compared." << endl);
        
    TH2D* h3 = (TH2D*)h1->Clone(h1->GetName()==h2->GetName() ?
                                MAKE_CSTRING(to_string(h1->GetName())) :
                                MAKE_CSTRING(to_string(h1->GetName()) + "_VS_" + to_string(h2->GetName())));
    h3->Reset();

    JTestResult r;

    double failures = 0;
    
    for (int i=1 ; i<nx1+1 ; ++i){
      for (int j=1 ; j<ny1+1 ; ++j){
        
        double m = h1 -> GetBinContent(i,j);
        double n = h2 -> GetBinContent(i,j);
        
        double p1 = 1 - ROOT::Math::poisson_cdf(m,1);
        double p2 = 1 - ROOT::Math::poisson_cdf(n,1);   

        cout << "m " <<  m << " pm " << p1 << " n " << n << " pn " << p2 << endl;

        if ((p1 > threshold && p2 < threshold) || 
            (p1 < threshold && p2 > threshold)){
          h3->Fill(i,j);
          failures+=1./(nx1*ny1);
        }        
      }
    }
      
    (failures > outliersThreshold ? r.passed = false : r.passed = true);
    
    r.message = MAKE_STRING(scientific << setprecision(2)<< "Test: " << "Chi2" <<
                            " HA: " << h1->GetUniqueID() << " " << h1->GetName() <<
                            " HB: " << h2->GetUniqueID() << " " << h2->GetName() <<
                            " Threshold: " << outliersThreshold << " Result: " << failures << " " << (r.passed ? "PASSED" : "FAILED"));

    JResultTitle title("Zero", "Failures[%] ", r.passed , failures * 100);
    
    h3->SetTitle(title.getTitle().c_str());
    
    r.obj = h3;

    return r;      
  };
}; 
  
#endif