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@millenia.cars.aps.anl.gov [ifeffit-bounces@millenia.cars.aps.anl.gov] on behalf of Rana, Jatinkumar Kantilal [jatinkumar.rana@helmholtz-berlin.de]
Sent: Friday, November 16, 2012 1:33 PM
To: ifeffit@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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