[Ifeffit] Re: statistical parameters (Josh Kas)

joshua jason kas hebhop at u.washington.edu
Wed Dec 14 13:24:49 CST 2005

I don't know what ifeffit does, but here is a nice paper by Ed Stern which 
goes through the theory

 	Number of relevant independent points in x-ray-absorption
 	fine-structure spectra.
 	PRB V. 48 Number 13

The conlcusion is that if you are using r-space data that includes r=0 

 	Nidp = 2dkdR/pi + 1

otherwise, when r=0 is not included in the fit

 	Nidp = 2dkdR/pi + 2

Hope this helps.
Josh Kas

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