SimpleStatistics Class Reference

#include <PopulationManager.h>

Public Member Functions
void	add_variable (double x)
	Add a value. More...
void	ClearData ()
	Clears the data. More...
double	get_meanvalue ()
	Returns the mean. More...
double	get_N ()
	Returns the number of values. More...
double	get_Total ()
	Returns the mean. More...
double	get_varianceP ()
	Returns the population variance. More...
double	get_varianceS ()
	Returns the sample variance. More...
void	remove_variable (double x)
	Remove a value. More...
	SimpleStatistics ()
	SimpleStatistics constructor. More...

Protected Attributes
double	m_K
double	m_n
double	m_Sum
double	m_SumX
double	m_SumX2

Constructor & Destructor Documentation

SimpleStatistics::SimpleStatistics ( )

inline

SimpleStatistics constructor.

        {
                ClearData();
        }

Member Function Documentation

void SimpleStatistics::add_variable ( double  x )

inline

Add a value.

                                   {
                // This uses the computed shifted data equation. 
                if (m_n == 0) m_K = x;
                m_n++;
                m_Sum += x;
                m_SumX += x - m_K;
                m_SumX2 += (x - m_K) * (x - m_K);
        }

void SimpleStatistics::ClearData ( )

inline

Clears the data.

        {
                m_K = 0;
                m_n = 0;
                m_Sum = 0;
                m_SumX = 0;
                m_SumX2 = 0;
        }

double SimpleStatistics::get_meanvalue ( )

inline

Returns the mean.

                              {
                return m_K + m_SumX / m_n;
        }

double SimpleStatistics::get_N ( )

inline

Returns the number of values.

                      {
                return m_n;
        }

double SimpleStatistics::get_Total ( )

inline

Returns the mean.

                          {
                return m_Sum;
        }

double SimpleStatistics::get_varianceP ( )

inline

Returns the population variance.

                              {
                if (m_n < 2)
                {
                        return -1; // Ilegal n value, but don't want to exit
                }
                return (m_SumX2 - (m_SumX*m_SumX) / m_n) / (m_n);
        }

double SimpleStatistics::get_varianceS ( )

inline

Returns the sample variance.

                              {
                if (m_n < 2)
                {
                        return -1; // Ilegal n value, but don't want to exit
                }
                return (m_SumX2 - (m_SumX*m_SumX) / m_n) / (m_n - 1);
        }

void SimpleStatistics::remove_variable ( double  x )

inline

Remove a value.

                                      {
                m_n--;
                m_Sum -= x;
                m_SumX -= (x - m_K);
                m_SumX2 -= (x - m_K) * (x - m_K);
        }

Member Data Documentation

double SimpleStatistics::m_K

protected

This class is designed to provide the facility to create simple stats from data that comes in incrementally. It can provide the mean, variance of the data set at any point in time

double SimpleStatistics::m_n

protected

double SimpleStatistics::m_Sum

protected

double SimpleStatistics::m_SumX

protected

double SimpleStatistics::m_SumX2

protected

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

• PopulationManager.h