Hi Mat,
In case of a Log likelihood fit, TH1::Fit computes an "Equivalent Chisquare"
by calling the function computing the sum of the squares of residuals
of the normal chisquare method once the minimisation is terminated.
See lines in TH1::Fit:
//*-* If Log Likelihood, compute an equivalent chisquare
if (Foption.Like) H1FitChisquare(npar, params, amin, params, 1);
Bins with no entries are not taken into account
Rene Brun
Matthew Martin wrote:
>
> Hi Rene,
> When I do something like:
>
> hist_bp_PtResidWeight->Fit("gaus","L");
>
> how is the resulting chisquare defined? Ie how does it deal with the
> possibility of some bins with zero events in them?
>
> cheers
>
> Mat
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