Re: [Ifeffit] Standard deviation of R value

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 wrote:

Hi Erin,

...

On Fri, Jan 11, 2019 at 8:19 AM Erin Finley 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 _______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit Unsubscribe: http://millenia.cars.aps.anl.gov/mailman/options/ifeffit

-- --Matt Newville <newville at cars.uchicago.edu> 630-252-0431 _______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit Unsubscribe: http://millenia.cars.aps.anl.gov/mailman/options/ifeffit