| VF_chiabs | VD_chiabs | VE_chiabs |
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| Function | Absolute-value analogue of the chi-square merit function. |
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| Syntax C/C++ | #include <VFstd.h>
float VF_chiabs( fVector X, fVector Y, fVector Wt, ui size ); |
| C++ VecObj | #include <OptiVec.h>
T vector<T>::chiabs( const vector<T>& Y, const vector<T>& Wt ); |
| Pascal/Delphi | uses VFstd;
function VF_chiabs( X, Y, Wt:fVector; size:UIntSize ): Single; |
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| Description | chiabs = sum( Wti * |Xi - Yi| ).
The chiabs function is a "robust" replacement for the c2 (chi-square) merit function. It is used to judge the quality of a fit in the presence of outlier points. The chiabs function is disturbed by outlier points to a lesser degree than the chi-square function. |
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| Return value | chiabs merit function. |
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