[Ifeffit] Standard deviation of R value

Erin Finley efinley9033 at icloud.com
Fri Jan 11 10:22:41 CST 2019


Thanks Matt! That makes perfect sense and what I had thought may be the case. 

Erin  

> On Jan 11, 2019, at 10:04 AM, Matt Newville <newville at cars.uchicago.edu> wrote:
> 
> Hi Erin, 
> 
>> On Fri, Jan 11, 2019 at 8:19 AM Erin Finley <efinley9033 at gmail.com> wrote:
>> Hello, I see in many publications the R value reported with a standard deviation. However, when I look at my resulting data from a fit I don't see one listed. I am still new to EXAFS research and so I am wondering where I can get this information. I am assuming I need to calculate it from another parameter I am just not sure which one.
>> 
> 
> The uncertainties in R are typically in the fit report.  But also, we typically refine a "delR" parameter that is R - Reff, where Reff is the distance (half path-lengh) for the scattering path.  So, if you don't see an uncertainty reported for R but do see an uncertainty for delR (or whatever parameter name you used), use that.  The uncertainty in R will (normally) be the uncertainty in delR.
> 
> If I'm misunderstanding the question, pleas give more details about what you are doing.
> 
> --Matt
> 
> 
> 
> 
> 
> 
>> Thanks for your help!
>> Cheers,
>> 
>> -- 
>> Erin Finley
>> PhD Candidate
>> Brgoch Research Group
>> Department of Chemistry
>> University of Houston
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> 
> 
> -- 
> --Matt Newville <newville at cars.uchicago.edu> 630-252-0431
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