[Ifeffit] Determining errors in R_fit
Anatoly I Frenkel
afrenke2 at yu.edu
Fri Nov 16 12:47:48 CST 2012
If Y = A + A*X, where A is a constant, X is an independent variable, and you know that X has uncertainty Delta X, then uncertainty in Y is: Delta Y = A * Delta X.
Anatoly
________________________________
From: ifeffit-bounces at millenia.cars.aps.anl.gov [ifeffit-bounces at millenia.cars.aps.anl.gov] on behalf of Rana, Jatinkumar Kantilal [jatinkumar.rana at helmholtz-berlin.de]
Sent: Friday, November 16, 2012 1:33 PM
To: ifeffit at millenia.cars.aps.anl.gov
Subject: [Ifeffit] Determining errors in R_fit
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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