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@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
------------------------------
Helmholtz-Zentrum Berlin für Materialien und Energie GmbH
Mitglied der Hermann von Helmholtz-Gemeinschaft Deutscher Forschungszentren e.V.
Aufsichtsrat: Vorsitzender Prof. Dr. Dr. h.c. mult. Joachim Treusch, stv. Vorsitzende Dr. Beatrix Vierkorn-Rudolph Geschäftsführung: Prof. Dr. Anke Rita Kaysser-Pyzalla, Thomas Frederking
Sitz Berlin, AG Charlottenburg, 89 HRB 5583
Postadresse: Hahn-Meitner-Platz 1 D-14109 Berlin
http://www.helmholtz-berlin.de
_______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit