SourceXtractorPlusPlus: ModelFitting::LogChiSquareComparator Class Reference

SourceXtractorPlusPlus 0.10

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Data vs model comparator which computes a modified $\chi^2$ residual. More...

#include <LogChiSquareComparator.h>

Public Member Functions
	LogChiSquareComparator (double u0=10.)
	Creates a new LogChiSquareComparator instance with the given . More...

double	operator() (double real, double model, double weight) const
	Returns the modified $\chi^2$ residual. More...

Private Attributes
double	m_u0

Detailed Description

Data vs model comparator which computes a modified $\chi^2$ residual.

The $\chi^2$ residual is modified to be more immune against occasionally large non-Gaussian deviations. It is computed as:

$g_{(u)} = \begin{cases} & u_0 * log\left( 1 + \dfrac{u}{u_0} \right) \text{ if } u \geqslant 0 \\ & -u_0 * log\left( 1 - \dfrac{u}{u_0} \right) \text{ if } u < 0 \end{cases}$

where:

: is a constant (typical value $\approx 10$ )
: is the weight of the residual
: is the real value of the data
: is the corresponding model value

Definition at line 52 of file LogChiSquareComparator.h.

Constructor & Destructor Documentation

ModelFitting::LogChiSquareComparator::LogChiSquareComparator ( double u0 = 10. )

inline

Creates a new LogChiSquareComparator instance with the given $u_0$ .

Definition at line 57 of file LogChiSquareComparator.h.

Member Function Documentation

double ModelFitting::LogChiSquareComparator::operator()	(	double	real,
		double	model,
		double	weight
	)		const

inline

Returns the modified $\chi^2$ residual.

Definition at line 60 of file LogChiSquareComparator.h.

References std::log(), and m_u0.

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Member Data Documentation

double ModelFitting::LogChiSquareComparator::m_u0

private

Definition at line 67 of file LogChiSquareComparator.h.

Referenced by operator()().

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

ModelFitting/ModelFitting/Engine/LogChiSquareComparator.h