Re: Monte Carlo, Genetic Algorithms (...) for Powder Structure

Alan Hewat, ILL Grenoble ( (no email) )
Wed, 28 Jan 1998 17:25:14 +0200

Bill David and Devinder Sivia wrote:

>Well this must sound like heresy to a Rietveld mailing list but ...
>
>if you have the correlated integrated intensities from a Pawley
>refinement then you can either refine on these or use the Rietveld
>method - it is really the same thing ...

Oh dear, I think they really mean it Armel :-( I hope we are not going to have
this old argument with the statisticians that Sakata, Cooper et al. started
25 years ago against the Rietveld method. To avoid that, and to convince us
experimentalists, how about refining the same data with the two "equivalent"
methods and demonstrating that it is "the same thing" in practice ie that
you get the same estimates of the parameters and standard deviations.

Alan Hewat, ILL Grenoble, FRANCE <hewat@ill.fr> tel (33) 4.76.20.72.13
ftp://ftp.ill.fr/pub/dif fax (33) 4.76.48.39.06 http://www.ill.fr/dif/