[Ifeffit] Query regarding error bars

Kelly, Shelly Shelly.Kelly at uop.com
Fri Jan 9 08:57:28 CST 2009

Hi Bindu,

There are lots of descriptions of these concepts on the exafs.org web page. Check out the Tutorials page.
I wrote about them in my book chapter on page 58. If you like, I can send you a copy. It is kinda big so you will need to have 8Meg space in your mail box.


-----Original Message-----
From: ifeffit-bounces at millenia.cars.aps.anl.gov on behalf of Bindu R.
Sent: Fri 1/9/2009 7:12 AM
To: ifeffit at millenia.cars.aps.anl.gov
Subject: [Ifeffit] Query regarding error bars

Hi all,


Could any tell me in a simple language about the error bars
returned by the EXAFS fitting program?


     do they exactly represent?How is
     it determined?How is
     the number of iterations decided.In
     addition to R-factor what are the other parameters which determines a good
     fit.For a
     R-factor ~0.001, if the value of chi2~10,000
     and reduced chi2 ~ 500, can one consider the fit to be good even if one gets a good match
     to the experimental spectra.


Dr.Bindu R.

Visiting Fellow



Tata Institute of Fundamental Research

Homi Bhabha Road


Mumbai-400 005


Contact Number

Lab- 022-2278 2256, 022-2278 2671


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