Dear Devidas,Brian Toby has a recent article that I think answers your questions (along with many other questions regarding R-factors) very well:Toby, B. H. "R factors in Rietveld analysis: How good is good enough?" Powder Diffraction 21(1) (2006) 67-70
Regards,Magnus H. SørbyOn 10/14/06, Joerg Ber
Dear all,
just some remarks on the topic:
-Maximum Likelihood, in general, is not unbiased. But we should
use an unbiased method at least for our cps (of course, nonlinear
equations are unbiased in general)
-expectation of course is unbiased. So we should use that.
-Now, for the common solution
1. How the weights are calculated?
wi= 1/variance. How it could be calculated, when there is just a point (at
that angle).
(in genral or in Fullprof)
2. On what basis Re or Rexp is defined?
...model is improper, if gof=Rwp/Re is less than '1'. Why? what does it
mean? Does it have conclusive expla
