"This implies that you don't even need to do the Rietveld refinement
(which I suppose Bill did not mean to imply :-) Extracting
intensities is just convenient and fast, not equivalent nor essential
in this case."
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 ...
Now, of course, most of the time we are not trying to solve
structures from powder diffraction data - we're refining structural
models that we know quite well already. Then there is, by the same
arguments, no need to do a Pawley + integrated intensity "two-stage"
method because the Rietveld method gives the answer directly.
Yours,
Bill David and Devinder Sivia.