JCOMPAREHISTOGRAMS::JTestRuns_Slice2D Class Reference

Implementation of the Chi2 test for 2D histograms. More...

#include <JTestRuns_Slice2D.hh>

Inheritance diagram for JCOMPAREHISTOGRAMS::JTestRuns_Slice2D:

Public Member Functions
	JTestRuns_Slice2D ()
	Default constructor.
void	test (const TObject *o1, const TObject *o2) override
	Tests the statistical compatibility of two ROOT TObjects.
std::istream &	read (std::istream &in) override
	Read test parameters from input.
virtual std::ostream &	write (std::ostream &out, const char delimiter=' ', const bool onlyFailures=false) const
	Write test result to output.
virtual void	save (TFile *f, const std::string &path, const bool onlyFailures=false) const
	Writes the test result to root file.
const std::string &	getTestName () const
	Get test name.
const std::string &	getResultType () const
	Get result type.

Protected Attributes
const std::string	testName
	test name
const std::string	resultType
	test result type

Private Attributes
double	threshold
	threshold value to decide if test is passed.
double	failuresThreshold
	threshold value to decide if test is passed.
char	slice
	Axis to slice. x or X for x-axis, y or Y for y-axis, n or N for None.

Detailed Description

Implementation of the Chi2 test for 2D histograms.

This class is derived from the abstract class JTest_t(). For a general description of the implementation of this and other tests derived from JTest_t(), see its documentation.
The parameter slice can have the values x, X, y or Y. The histograms are sliced along the corresponding axis, and the runs test is applied to each slice.
This test uses the input parameter threshold to evaluate whether the test is passed or failed for each slice.
The evaluation is done by comparing the threshold value with the result of the runs test.
The results for each slice are stored in the results buffer (see JTest_t())

Definition at line 32 of file JTestRuns_Slice2D.hh.

Constructor & Destructor Documentation

JTestRuns_Slice2D()

JCOMPAREHISTOGRAMS::JTestRuns_Slice2D::JTestRuns_Slice2D ( )

inline

Default constructor.

Definition at line 40 of file JTestRuns_Slice2D.hh.

                        :
      JTest_t("Runs_2D", "#sigma")
    {}

Member Function Documentation

test()

void JCOMPAREHISTOGRAMS::JTestRuns_Slice2D::test ( const TObject * o1, const TObject * o2 )

inlineoverridevirtual

Tests the statistical compatibility of two ROOT TObjects.

Parameters

o1	First object
o2	Second object

Implements JCOMPAREHISTOGRAMS::JTest_t.

Definition at line 51 of file JTestRuns_Slice2D.hh.

    {    
      using namespace std;
      using namespace JPP;
 
      const TH2* h1 = dynamic_cast<const TH2*>(o1);
      const TH2* h2 = dynamic_cast<const TH2*>(o2);
 
      if (h1 == NULL || h2 == NULL) {
        THROW(JValueOutOfRange, "JTestKolmogorov_Slice2D::test(): Could not cast given TObjects to TH2.");
      }
 
      TH1* h3 = NULL;
 
      const char* const h3name = (h1->GetName() == h2->GetName() ?
                                  MAKE_CSTRING(h1->GetName()                            << "_" << testName << "_" << slice) :
                                  MAKE_CSTRING(h1->GetName() << "_VS_" << h2->GetName() << "_" << testName << "_" << slice));
      
      int  nFailures = 0;
      int  nSlices   = 0;
    
      if (slice == 'x' || slice == 'X') {
    
        const int nSlices1 = h1->GetNbinsX();
        const int nSlices2 = h2->GetNbinsX();
        
        if (nSlices1 != nSlices2) {
          THROW(JValueOutOfRange, "JTestRuns_Slice2D::test(): Histograms with different binning. The objects: " << h1->GetName() << " and " << h2->GetName() << " can not be compared." << endl);
        }
 
        nSlices = nSlices1;
 
        h3 = h1->ProjectionX(h3name);
 
        for (int i=1 ; i<=nSlices1 ; ++i){
 
          const std::string sliceName = MAKE_STRING(h3->GetName() << "_" << to_string(i));
             
          const TH1* s1 = h1->ProjectionY (sliceName.c_str(),i,i);
          const TH1* s2 = h2->ProjectionY (sliceName.c_str(),i,i);
 
          if (!(s1->GetSumOfWeights() > 0 && s2->GetSumOfWeights() > 0)) { continue; }
                
          const double R = s1->Integral();
          const double T = s2->Integral();
 
          bool a = ((T/R)*s1->GetBinContent(1) - s2->GetBinContent(1)) < 0;
          
          int    n = 1;
          double p = (a ? 1 : 0);
          double q = (a ? 0 : 1);
 
          for (int i = 2 ; i<s1->GetNbinsX() ; ++i){
      
            const bool b = ((T/R)*s1->GetBinContent(i) - s2->GetBinContent(i)) < 0;
 
            (b ? ++p : ++q);
 
            if (b != a){
              ++n;
              a=b;
            }
          }
 
          const double N = 1 + 2*p*q/(p+q) ;
          const double s = sqrt( 2*p*q*(2*p*q-p-q)/(p+q)/(p+q)/(p+q-1) );
          const double d = (n-N)/s;
 
          if (fabs(d) > threshold) nFailures++;
        
          h3->SetBinContent(i,fabs(d));
        }
            
      } else if (slice == 'y' || slice == 'Y') {
      
        const int nSlices1 = h1->GetNbinsX();
        const int nSlices2 = h2->GetNbinsX();
      
        if (nSlices1 != nSlices2) {
          THROW(JValueOutOfRange, "JTestRuns_Slice2D::test(): Histograms with different binning. The objects: " << h1->GetName() << " and " << h2->GetName() << " can not be compared." << endl);
        }
 
        nSlices = nSlices1;
 
        h3 = h1->ProjectionY(h3name);
 
        for (int i=1 ; i<=nSlices1 ; ++i){
 
          const std::string sliceName = MAKE_STRING(h3->GetName() << "_" << to_string(i));
             
          const TH1* s1 = h1->ProjectionX (sliceName.c_str(),i,i);
          const TH1* s2 = h2->ProjectionX (sliceName.c_str(),i,i);
 
          if (!(s1->GetSumOfWeights() > 0 && s2->GetSumOfWeights() > 0)) { continue; }
                
          const double R = s1->Integral();
          const double T = s2->Integral();
 
          bool a = ((T/R)*s1->GetBinContent(1) - s2->GetBinContent(1)) < 0;
          
          int    n = 1;
          double p = (a ? 1 : 0);
          double q = (a ? 0 : 1);
 
          for (int i = 2 ; i<s1->GetNbinsX() ; ++i){
      
            const bool b = ((T/R)*s1->GetBinContent(i) - s2->GetBinContent(i)) < 0;
 
            (b ? ++p : ++q);
 
            if (b != a){
              ++n;
              a=b;
            }
          }
 
          const double N = 1 + 2*p*q/(p+q) ;
          const double s = sqrt( 2*p*q*(2*p*q-p-q)/(p+q)/(p+q)/(p+q-1) );
          const double d = (n-N)/s;
 
          if (fabs(d) > threshold) nFailures++;
        
          h3->SetBinContent(i,fabs(d));
        }
      }
 
      const bool passed = (nFailures/nSlices < failuresThreshold);
      
      const JResultTitle title(testName, resultType, passed , nFailures);
 
      h3->SetTitle(title.getTitle().c_str());
      h3->GetYaxis()->SetTitle(resultType.c_str());      
      
      const JTestResult r(testName,
                          JRootObjectID(MAKE_STRING(h1->GetDirectory()->GetPath() << h1->GetName())),
                          JRootObjectID(MAKE_STRING(h2->GetDirectory()->GetPath() << h1->GetName())),
                          resultType, nFailures, failuresThreshold, h3, passed);
 
      this->push_back(r);
    }

read()

std::istream & JCOMPAREHISTOGRAMS::JTestRuns_Slice2D::read ( std::istream & in )

inlineoverridevirtual

Read test parameters from input.

Parameters

in	input stream

Returns

input stream

Implements JCOMPAREHISTOGRAMS::JTest_t.

Definition at line 199 of file JTestRuns_Slice2D.hh.

    {
      using namespace JPP;
      
      in >> threshold >> failuresThreshold >> slice;
 
      if (threshold < 0.0) {
        THROW(JValueOutOfRange, "JTestRuns_Slice2D::read(): Invalid failuresThreshold value " << failuresThreshold);
      }
      
      if (failuresThreshold < 0.0 || failuresThreshold > 1.0) {
        THROW(JValueOutOfRange, "JTestRuns_Slice2D::read(): Invalid failuresThreshold value " << failuresThreshold);
      }
 
      if (slice != 'x' && slice != 'X' && slice != 'y' && slice != 'Y') {
        THROW(JValueOutOfRange, "JTestRuns_Slice2D::read(): Invalid slice option \'" << slice << "\'");
      }
                                                                           
      return in;
    };

write()

virtual std::ostream & JCOMPAREHISTOGRAMS::JTest_t::write ( std::ostream & out, const char delimiter = ' ', const bool onlyFailures = false ) const

inlinevirtualinherited

Write test result to output.

Parameters

out	output stream
delimiter	field delimiter
onlyFailures	if true, write only failures.

Returns

output stream

Definition at line 84 of file JTest_t.hh.

    {
      using namespace std;
      using namespace JPP;
 
      for (vector<JTestResult>::const_iterator r = this->begin() ; r != this->end() ; ++r) {
 
        if (onlyFailures && r->passed) { continue; }
        
        print(out, *r, delimiter, true);
      }
      
      return out;
    }

save()

virtual void JCOMPAREHISTOGRAMS::JTest_t::save ( TFile * f, const std::string & path, const bool onlyFailures = false ) const

inlinevirtualinherited

Writes the test result to root file.

Parameters

f	A ROOT file
path	Path in root file.
onlyFailures	If true, write only failures.

Definition at line 108 of file JTest_t.hh.

    {
      using namespace std;
      using namespace JPP;
 
      if (f->GetDirectory(path.c_str())==0) {
        f->mkdir(path.c_str());
      }
      
      f->cd(path.c_str());
 
      for (vector<JTestResult>::const_iterator r = this->begin() ; r != this->end() ; ++r) {
 
        if (onlyFailures && r->passed) { continue; }
        
        r->obj->Write();
      }
    }

getTestName()

const std::string & JCOMPAREHISTOGRAMS::JTest_t::getTestName ( ) const

inlineinherited

Get test name.

Returns

test name

Definition at line 135 of file JTest_t.hh.

    {
      return testName;
    }

getResultType()

const std::string & JCOMPAREHISTOGRAMS::JTest_t::getResultType ( ) const

inlineinherited

Get result type.

Returns

result type

Definition at line 146 of file JTest_t.hh.

    {
      return resultType;
    }

Member Data Documentation

threshold

double JCOMPAREHISTOGRAMS::JTestRuns_Slice2D::threshold

private

threshold value to decide if test is passed.

Definition at line 222 of file JTestRuns_Slice2D.hh.

failuresThreshold

double JCOMPAREHISTOGRAMS::JTestRuns_Slice2D::failuresThreshold

private

threshold value to decide if test is passed.

Definition at line 223 of file JTestRuns_Slice2D.hh.

slice

char JCOMPAREHISTOGRAMS::JTestRuns_Slice2D::slice

private

Axis to slice. x or X for x-axis, y or Y for y-axis, n or N for None.

Definition at line 224 of file JTestRuns_Slice2D.hh.

testName

const std::string JCOMPAREHISTOGRAMS::JTest_t::testName

protectedinherited

test name

Definition at line 180 of file JTest_t.hh.

resultType

const std::string JCOMPAREHISTOGRAMS::JTest_t::resultType

protectedinherited

test result type

Definition at line 181 of file JTest_t.hh.

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The documentation for this class was generated from the following file:

• JTestRuns_Slice2D.hh