Hello,

I have a couple of questions about data analysis on artemis

I used a restraint for my fits. I've read some documentation about it and found Matt Newville's talk (https://pubweb.bnl.gov/~frenkel/BNLworkshop2001/newville.pdf). It is reported that a restraint adds a "V" term to the chi-square (slides number 16 and 17).

According to this formula, what is the number that artemis gives for the "restrain" parameter at the end of the fit? How should we consider this number in the evaluation of the fit ?

I also don't really know very much about the scaling factor to apply in the formula : scale*penalty(X,a,b). I've read that the square root of chi-square seems to be a good size from some of Bruce Ravel's answers in ifeffit mailing list. How does the scaling factor control the restraint ? What is its relationship with the chi-square ?

Thank you in advance for your help,

Maureen

PhD student at CIRAD - ADEME
CEREGE - Europôle de l'Arbois
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