/data/refman/pasoursint/CMSSW_6_1_2_SLHC4_patch1/src/SimCalorimetry/CaloSimAlgos/src/CaloValidationStatistics.cc

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#include "SimCalorimetry/CaloSimAlgos/interface/CaloValidationStatistics.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include <cmath>
#include <iostream>

CaloValidationStatistics::CaloValidationStatistics(std::string name, float expectedMean, float expectedRMS) 
:  name_(name),
   expectedMean_(expectedMean),
   expectedRMS_(expectedRMS),
   sum_(0.),
   sumOfSquares_(0.),
   weightedSum_(0.),
   sumOfWeights_(0.),
   n_(0)
{
}


CaloValidationStatistics::~CaloValidationStatistics() 
{
  edm::LogInfo("CaloValidationStatistics") << *this;
}

void CaloValidationStatistics::addEntry(float value, float weight) {
  sum_ += value;
  sumOfSquares_ += (value*value);
  weightedSum_ += value*weight;
  sumOfWeights_ += weight;
  ++n_;
}


float CaloValidationStatistics::mean() const {
  return sum_/n_;
}


float CaloValidationStatistics::RMS() const {
  float numerator = n_ * sumOfSquares_ - sum_*sum_;
  int denominator = n_ * (n_-1);
  return std::sqrt(numerator/denominator);
}

 
float CaloValidationStatistics::weightedMean() const  {
  return weightedSum_ / sumOfWeights_;
}


std::ostream& operator<<(std::ostream & os,const CaloValidationStatistics & stat) {
  os << "OVAL " << stat.name() << " entries:" << stat.nEntries();
  if(stat.nEntries() > 0) {
     os << " Mean: " << stat.mean() 
        << " (expect " << stat.expectedMean() << ")";
  }
  if(stat.nEntries() > 1) {      
                 os << "  RMS: " << stat.RMS()
        << " (expect " << stat.expectedRMS() << ")";
  }
  return os;
}