goodnessOfFit cost function vs coefficient of determination

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Burke Rosen
Burke Rosen 2019-1-9
Why does the fit index returned by
fit = goodnessOfFit(x,xref,'NMSE');
Vary betwee -Inf and 1 (prefect fit).
While the coefficient of determination (see example) varies between 0 and 1 (perfect fit).

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