[Ifeffit] Determining errors in R_fit

[Jason Gaudet]

Since R_eff is constant, surely all you need to do is multiply R_eff by the
uncertainty in alpha?  That will be the uncertainty in delta_R and R_fit.

The program is only giving you statistically-derived uncertainty for the
values it fits; the user needs to determine how to propagate or otherwise
deal with this uncertainty.

-Jason

On Fri, Nov 16, 2012 at 1:33 PM, Rana, Jatinkumar Kantilal <
jatinkumar.rana at helmholtz-berlin.de> wrote:

>  Dear Ifeffit users,
>
>
>
> I have a very simple doubt about reporting the uncertainties in R_fit.
>
>
>
> In the fit, I have assumed that a bond length changes by a constant
> fraction, **alpha** such that
>
>
>
> Delta R = R_effective * alpha
>
>
>
> and,
>
>
>
> R_fit = R_effective +/- Delta R
>
>
>
> I can get uncertainties in the fitted value of **alpha** from artemis.
> But the question is how to work out the uncertainties in the  R_fit. Will
> it be same as that of **alpha** ??
>
>
>
> Thanks in advance !!!
>
>
>
> With best regards,
>
> Jatin
>
>
>
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