ChiSquaredProbability.h File Reference

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Functions
float	ChiSquaredProbability (double chiSquared, double nrDOF)
float	LnChiSquaredProbability (double chiSquared, double nrDOF)

Function Documentation

ChiSquaredProbability()

float ChiSquaredProbability	(	double	chiSquared,
		double	nrDOF
	)

Returns the probability that an observation, correctly described by a model with nrDOF, will give rise to a chi-squared larger than the one observed; from this, one can interpret this probability as how likely it is to observe as high (or higher) a chi-squared. source: Numerical Recipes

Definition at line 13 of file ChiSquaredProbability.cc.

                                                             {
  return IncompleteGammaComplement::value(nrDOF / 2, chiSquared / 2);
}

References IncompleteGammaComplement::value().

Referenced by BPHGenericVertexSelect::accept(), OuterTrackerMonitorTTTrack::analyze(), ElectronConversionRejectionValidator::analyze(), TkConvValidator::analyze(), PhotonValidator::analyze(), OverlapValidation::analyze(), PhotonAnalyzer::analyze(), ConversionProducer::buildCollection(), ConfigurableTrimmedVertexFinder::clean(), egammaisolation::EgammaTrackExtractor::deposit(), CSCOfflineMonitor::doSegments(), CSCValidation::doSegments(), VertexFitterResult::fill(), MuonTrackAnalyzer::fillPlots(), SVTagInfoValidationAnalyzer::fillRecoToSim(), recoBSVTagInfoValidationAnalyzer::fillRecoToSim(), SVTagInfoValidationAnalyzer::fillSimToReco(), recoBSVTagInfoValidationAnalyzer::fillSimToReco(), LeptonSkimming::filter(), OniaPhotonConversionProducer::HighpuritySubset(), CSCSegAlgoTC::isSegmentGood(), egammaisolation::EgammaTrackSelector::operator()(), ChiSquared::probability(), PFConversionProducer::produce(), ConversionTrackMerger::produce(), CSCSegAlgoST::prune_bad_hits(), ConversionVertexFinder::run(), CSCSegAlgoTC::segmentSort(), TrimmedVertexFinder::theWorst(), and PrimaryVertexMonitor::vertexPlots().

LnChiSquaredProbability()

float LnChiSquaredProbability	(	double	chiSquared,
		double	nrDOF
	)

Definition at line 17 of file ChiSquaredProbability.cc.

                                                               {
  return IncompleteGammaComplement::ln(nrDOF / 2, chiSquared / 2);
}

References IncompleteGammaComplement::ln().

Referenced by ChiSquared::lnProbability(), GlobalTrackQualityProducer::trackProbability(), and GlobalTrajectoryBuilderBase::trackProbability().