---

Accumulator Class Reference

For validation purposes. More...

#include <CommonTools/Statistics/interface/Accumulator.h>

List of all members.

Public Member Functions
	Accumulator ()
void	addEntry (double value, double weight=1.)
double	mean () const
unsigned long	nEntries () const
double	sigma () const
double	variance () const
double	weightedMean () const
Private Attributes
unsigned long	n_
double	sum_
double	sumOfSquares_
double	sumOfWeights_
double	weightedSum_

---

Detailed Description

For validation purposes.

This program calculates mean and RMS of a distribution

Rick Wilkinson

Definition at line 12 of file Accumulator.h.

---

Constructor & Destructor Documentation

Accumulator::Accumulator

(

)

Definition at line 5 of file Accumulator.cc.

:  sum_(0.),
   sumOfSquares_(0.),
   weightedSum_(0.),
   sumOfWeights_(0.),
   n_(0)
{
}

---

Member Function Documentation

void Accumulator::addEntry	(	double	value,
		double	weight = 1.
	)

Definition at line 15 of file Accumulator.cc.

References n_, sum_, sumOfSquares_, sumOfWeights_, and weightedSum_.

                                                      {
  sum_ += value;
  sumOfSquares_ += (value*value);
  weightedSum_ += value*weight;
  sumOfWeights_ += weight;
  ++n_;
}

double Accumulator::mean

(

)

const

Definition at line 24 of file Accumulator.cc.

References n_, and sum_.

Referenced by operator<<(), and variance().

                               {
  return sum_/n_;
}

unsigned long Accumulator::nEntries

(

)

const [inline]

Definition at line 27 of file Accumulator.h.

References n_.

Referenced by operator<<().

{return n_;}

double Accumulator::sigma

(

)

const [inline]

Definition at line 23 of file Accumulator.h.

References funct::sqrt(), and variance().

Referenced by operator<<().

{return std::sqrt(variance());}

double Accumulator::variance

(

)

const

Definition at line 29 of file Accumulator.cc.

References mean(), n_, sum_, and sumOfSquares_.

Referenced by sigma().

                                   {
  double numerator = sumOfSquares_ - sum_*mean();
  unsigned long denominator = n_-1;
  return numerator/denominator;
}

double Accumulator::weightedMean

(

)

const

Definition at line 36 of file Accumulator.cc.

References sumOfWeights_, and weightedSum_.

                                        {
  return weightedSum_ / sumOfWeights_;
}

---

Member Data Documentation

unsigned long Accumulator::n_ [private]

Definition at line 34 of file Accumulator.h.

Referenced by addEntry(), mean(), nEntries(), and variance().

double Accumulator::sum_ [private]

Definition at line 30 of file Accumulator.h.

Referenced by addEntry(), mean(), and variance().

double Accumulator::sumOfSquares_ [private]

Definition at line 31 of file Accumulator.h.

Referenced by addEntry(), and variance().

double Accumulator::sumOfWeights_ [private]

Definition at line 33 of file Accumulator.h.

Referenced by addEntry(), and weightedMean().

double Accumulator::weightedSum_ [private]

Definition at line 32 of file Accumulator.h.

Referenced by addEntry(), and weightedMean().

---

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

• CommonTools/Statistics/interface/Accumulator.h
• CommonTools/Statistics/src/Accumulator.cc

---