Re: Cash statistic fitting bug?

On 07/30/2013 07:39 PM, John Houck wrote:
> This limitation of mpfit is noted in the mpfit help page which
> says:
> 
>  DESCRIPTION
>     The mpfit Levenberg-Marquardt algorithm is the default
>     minimization algorithm used in fitting models to data.  This
>     algorithm was derived under the assumption that the function to
>     be minimized is the Chi-square fit-statistic.

But as mpfit is the standard fit algorithm, I consider the current setup
somehow dangerous: If you simply switch from Chi-square to Cash that
means that you'll get wrong results if you don't adjust the
fit-algorithm, too. Maybe some kind of warning could be added if the
Cash statistic is evaluated with mpfit (or at some other place) to avoid
further confusion and problems? Or even refuse to fit Cash with mpfit?

Cheers,
Thomas


----
You received this message because you are
subscribed to the isis-users list.
To unsubscribe, send a message to
isis-users-request_at_email.domain.hiddenwith the first line of the message as:
unsubscribe