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 \(u_0\).

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

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:

\(u_0\): is a constant (typical value \(\approx 10\))
\( u=w*(r-m) \)
\(w\): is the weight of the residual
\(r\): is the real value of the data
\(m\): is the corresponding model value

Definition at line 52 of file LogChiSquareComparator.h.

Constructor & Destructor Documentation

◆ LogChiSquareComparator()

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

◆ operator()()

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::log1p(), and m_u0.

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Member Data Documentation

◆ m_u0

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

Public Member Functions