Hi Everyone, If you like this thread, you will probably like Brian Toby's excellent little treatise:
Brian H. Toby - R factors in Rietveld analysis: How good is good enough? Powder Diffraction, v 21, p 67 (2006) The journal Powder Diffraction doesn't have a super-wide circulation but contains some gems such as this one (and many others!). Simon On Fri, Mar 6, 2009 at 4:24 AM, Eduard E. Levin <le...@elch.chem.msu.ru> wrote: > Dear Olga! > Maybe you should explain what do you mean by saying "background"? > To my opinion you were given an exhaustive answer, but you still disagree > with companions. > This is puzzling. > I suppose that you are assigning as background contribution from partially > amorphous phase. > Glass sample holder, for example, or carbon black. > If I'm correct, that the answer would be simple - under this conditions you > should never substract background. > > > Eduard. > > ----- Original Message ----- From: "Olga Smirnova" > <olga.smirn...@hw7.ecs.kyoto-u.ac.jp> > Cc: <rietveld_l@ill.fr> > Sent: Friday, March 06, 2009 8:55 AM > Subject: Re: cRs > > >>> As a rule, before doing that I'd switch to xye format to preserve the >>> statistics >> >> Wow. What a rule. >> Did anyone try to calculate simple mean deviance and compare with popular >> R factors? >> >> OS >> > > -- Prof. Simon Billinge Applied Physics & Applied Mathematics Columbia University 500 West 120th Street Room 200 Mudd, MC 4701 New York, NY 10027 Tel: (212)-854-2918 (o) 851-7428 (lab) Condensed Matter and Materials Science Brookhaven National Laboratory P.O. Box 5000 Upton, NY 11973-5000 (631)-344-5387 email: sb2896 at columbia dot edu home: http://nirt.pa.msu.edu/ -- Prof. Simon Billinge Applied Physics & Applied Mathematics Columbia University 500 West 120th Street Room 200 Mudd, MC 4701 New York, NY 10027 Tel: (212)-854-2918 (o) 851-7428 (lab) Condensed Matter and Materials Science Brookhaven National Laboratory P.O. Box 5000 Upton, NY 11973-5000 (631)-344-5387 email: sb2896 at columbia dot edu home: http://nirt.pa.msu.edu/
