Re: Bragg R and GSAS

[Jon Wright]

In comparing refinements with different powder datasets there is no 
"number of observations" in common usage and no 10:1 rule of thumb. 
Broadly, this means "crappy" data with a chemically unreasonable model 
can sometimes give much better figures of merit than a good structure 
with "good" data.

Sad, isn't it?

Jon

Von Dreele, Robert B. wrote:

Nandini,
I suggest you look at the paper "Rietveld refinement guidelines", J. Appl. Cryst. 
(1999) 32, 36-50.
Bob Von Dreele
-----Original Message-----
From: Nandini Devi Radhamonyamma [mailto:[EMAIL PROTECTED]
Sent: Thu 2/26/2004 8:38 AM
To: [EMAIL PROTECTED]
Thank you.
In parallel with single crystal analysis, is there an
accepted limit for R(F2) or any other parameter like
Rexp to follow? I'm using synchrotron data.
nandini