….and what we are trying to say is that your method is not generally accepted as the best way to model data.

Shelly

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From: ifeffit-bounces@millenia.cars.aps.anl.gov [mailto:ifeffit-bounces@millenia.cars.aps.anl.gov] On Behalf Of abhijeet gaur
Sent: Friday, April 17, 2009 2:29 AM
To: ifeffit
Subject: [Ifeffit] Fitting procedure

Hi all,

         Thanks to all the concerned persons for having such a wonderful discussion over fitting procedure. I am able to understand the things better by going through these discussions. But what I am trying to say is that I had first applied the fitting procedure in which I make the parameters of all paths( included in the fit) to vary simultaneously, but the problem is that I am not able to get a good fit and the parameters for different paths are also coming absurd like very low amplitude etc. For days I have been trying this method of fitting but not able to get good results.I tried different models also like Debye & Einstien model, I used the relation del r= alpha* Reff but it doesn't work. Then I switch to this the method in which we fit the first shell, get the parameters fix them and then go for the next shell and in this way e fix the whole spectra. The results I got are extremely good. Thus I am using this method. 

                                                                                                                                                         Abhijeet Gaur