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From: Beekman, Matthew [mailto:mbeek...@cas.usf.edu]
Sent: Saturday, March 07, 2009 7:20 PM
To: Peter Y. Zavalij; rietveld_l@ill.fr
Subject: RE: cRs
Hello all,
A quick question regarding the background subtracted R values:
In the .LST file, GSAS gives two sets of values for
er to an enquiry of your present Chair
(a former referee of my thesis), and received back lots of pain.
Please, stop. I attach the conference contribution to your attention.
- Original Message -
>> From: "Eduard E. Levin"
>> To:
>> Cc:
>> Date: 2009-
Olga Smirnova wrote:
Did anyone try to calculate simple mean deviance and compare with
popular R factors?
OS
For "simple mean deviance" do you mean like in:
http://en.wikipedia.org/wiki/Deviance_(statistics)
Seems we normally call that "chi^2". If that's what you meant, then yes,
people do
ass 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"
Cc:
Sent: Friday, March 06, 2009 8:55 AM
Subject: Re: cRs
ch 04, 2009 8:17 AM
*To:* Jon Wright; olga.smirn...@hw7.ecs.kyoto-u.ac.jp
*Cc:* rietveld_l@ill.fr
*Subject:* RE: cRs
I'll put my tuppence worth in here as there can be another
consideration with high backgrounds.
Normally I wouldn't touch the background, but there are times when a
a]
*Sent:* Wednesday, March 04, 2009 8:17 AM
*To:* Jon Wright; olga.smirn...@hw7.ecs.kyoto-u.ac.jp
*Cc:* rietveld_l@ill.fr
*Subject:* RE: cRs
I'll put my tuppence worth in here as there can be another
consideration with high backgrounds.
Normally I wouldn't touch the background, but ther
2009 8:17 AM
To: Jon Wright; olga.smirn...@hw7.ecs.kyoto-u.ac.jp
Cc: rietveld_l@ill.fr
Subject: RE: cRs
I'll put my tuppence worth in here as there can be another consideration
with high backgrounds.
Normally I wouldn't touch the background, but there are times when a high
background
erful, if slightly meaningless Rwp for the paper!
Pam
From: Jon Wright [mailto:wri...@esrf.fr]
Sent: Wed 04/03/2009 4:00 AM
To: olga.smirn...@hw7.ecs.kyoto-u.ac.jp
Cc: rietveld_l@ill.fr
Subject: Re: cRs
Dear Olga,
As you've noticed, the Rietveld R-fa
om: Maxim V. Lobanov [mailto:m_loba...@huntsman-nmg.com]
Sent: Tue 3/3/2009 11:35 PM
To: rietveld_l@ill.fr
Subject: RE: cRs
As far as I understand, the major issue is that BG subtraction changes the
error statistics (accordingly, weights applied in calculating function to
minimize...). It is also somewh
Dear All,
I think one should not just say that it is /verbotten /to "subtract"
background.
Merci to all replies. I would swallow and 'subtract' if I would not be full.
:-)
Best regards,
Olga
Olga Smirnova wrote:
Andreas Leineweber wrote:
Dear all,
I think one should not just say that i
Dear Olga,
As you've noticed, the Rietveld R-factors tell you how well you fit the
pattern, but don't tell you how well you fit the peaks. There is a
correlated intensities R-factor which follows from the methods outlined in:
J. Appl. Cryst. (2004). 37, 621-628[ doi:10.1107/S0021889804013
Maxim V. Lobanov wrote:
> However, some Rietveld programs do not have good selection of BG functions,
> and it is sometimes problematic to correctly fit the BG - so, I think in this
> case
> careful BG removal would be the only option.
Not the only option...
You have an option to forget about th
ow...@csiro.au]
Sent: Wednesday, March 04, 2009 8:32 AM
To: olga.smirn...@hw7.ecs.kyoto-u.ac.jp
Cc: rietveld_l@ill.fr
Subject: RE: cRs
It's German... "verboten" == forbidden.
You should never delete the background from a diffraction pattern prior to
(Rietveld) analysis.
It changes
South, Victoria
AUSTRALIA 3169
Ph: +61 3 9545 8892
Fax: +61 3 9562 8919 (site)
Email: matthew.row...@csiro.au
-Original Message-
From: Olga Smirnova [mailto:olga.smirn...@hw7.ecs.kyoto-u.ac.jp]
Sent: Wednesday, 4 March 2009 16:30
To: Brian O'Connor
Cc: rietveld_l@ill.fr
Subject: Re:
According to my computer, I received your response 4 minutes earlier
than forwarded the email.
What is 'verbotten' (volabulary does not find) ?
OS
Brian O'Connor wrote:
Background removal is verbotten!
Brian O'Connor
From: Olga Smirnova [mailto:olga.smirn...@h
Background removal is verbotten!
Brian O'Connor
From: Olga Smirnova [mailto:olga.smirn...@hw7.ecs.kyoto-u.ac.jp]
Sent: Wed 4/03/2009 2:14 PM
To: rietveld_l@ill.fr
Subject: cRs
Dear All,
How is life with conventional R factors when you always have to divide
by
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