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/* TwoDimensionalStatistics.cc
*/
#include "osl/stat/twoDimensionalStatistics.h"
#include "osl/stat/average.h"
#include <cmath>
class osl::stat::TwoDimensionalStatistics::Data
{
public:
Average m_x, m_y, m_x2, m_y2, m_xy;
// MANIPULATORS
void add(const double& x, const double& y)
{
m_x.add(x);
m_y.add(y);
m_x2.add(x*x);
m_y2.add(y*y);
m_xy.add(x*y);
}
void merge(const Data& r)
{
m_x.merge(r.m_x);
m_y.merge(r.m_y);
m_x2.merge(r.m_x2);
m_y2.merge(r.m_y2);
m_xy.merge(r.m_xy);
}
void clear()
{
m_x.clear();
m_y.clear();
m_x2.clear();
m_y2.clear();
m_xy.clear();
}
};
// CREATORS
osl::stat::TwoDimensionalStatistics::
TwoDimensionalStatistics() : m_data(new Data())
{
}
osl::stat::TwoDimensionalStatistics::
~TwoDimensionalStatistics()
{
}
// MANIPULATORS
void osl::stat::TwoDimensionalStatistics::
add(const double& x, const double& y)
{
m_data->add(x,y);
}
void osl::stat::TwoDimensionalStatistics::
merge(const TwoDimensionalStatistics& r)
{
m_data->merge(*r.m_data);
}
void osl::stat::TwoDimensionalStatistics::
clear()
{
m_data->clear();
}
// ACCESSORS
size_t osl::stat::TwoDimensionalStatistics::
size() const
{
return m_data->m_x.numElements();
}
double osl::stat::TwoDimensionalStatistics::
averageX() const
{
return m_data->m_x.getAverage();
}
double osl::stat::TwoDimensionalStatistics::
averageY() const
{
return m_data->m_y.getAverage();
}
double osl::stat::TwoDimensionalStatistics::
averageX2() const
{
return m_data->m_x2.getAverage();
}
double osl::stat::TwoDimensionalStatistics::
averageY2() const
{
return m_data->m_y2.getAverage();
}
double osl::stat::TwoDimensionalStatistics::
averageXY() const
{
return m_data->m_xy.getAverage();
}
double osl::stat::TwoDimensionalStatistics::
meanSquaredErrors() const
{
return averageX2() - 2*averageXY() + averageY2();
}
double osl::stat::TwoDimensionalStatistics::
meanSquaredErrorsAdjustConstant() const
{
return averageX2() - averageX()*averageX()
-2*(averageXY() - averageX()*averageY())
+ averageY2() - averageY()*averageY();
}
double osl::stat::TwoDimensionalStatistics::
correlation() const
{
return (averageXY() - averageX()*averageY())
/ sqrt((averageX2() - averageX()*averageX())
* (averageY2() - averageY()*averageY()));
}
void osl::stat::TwoDimensionalStatistics::
fitting(double &a, double &b, double &residual) const
{
double d = averageX2() - averageX()*averageX();
double n = averageXY() - averageX()*averageY();
if (std::abs(d) < 1e-8) {
a = 0.0;
b = averageY();
residual = averageY2() - averageY()*averageY();
return;
}
a = n / d;
b = (averageX2()*averageY() - averageXY()*averageX()) / d;
residual = averageY2()-averageY()*averageY()
- n * n / d;
}
/* ------------------------------------------------------------------------- */
// ;;; Local Variables:
// ;;; mode:c++
// ;;; c-basic-offset:2
// ;;; End:
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