[Ifeffit] Re: statistical parameters (Josh Kas)

[joshua jason kas]

Hi,
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 
then

 	Nidp = 2dkdR/pi + 1

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

 	Nidp = 2dkdR/pi + 2

Hope this helps.
Josh Kas