Subject: Re: [ccp4bb] differences between Rsym and Rmerge
>adding any useful information? However, in most cases it isn't
>critical except for referees (1.99Å resolution, anyone?)
I thought that as author of Scala I might put in my 2 penn'th to this
discussion, FWIW
1. I've never been able to find any useful distinction between Rsym &
Rmerge, and when filling in the PDBs request for both (undefined by
them and irritatingly restricted to < 0.99, at least in Autodep)
;>>> at 2.6A resolution and I'm wondering what is the acceptable value
>>>>> (range) of R-merge that worth the time to continue processing! Very
>>>>> anxious to hear your thoughts. Thanks, M
>>>>> ***
AIL.AC.UK
Subject: Re: [ccp4bb] differences between Rsym and Rmerge
On Friday 18 January 2008 09:30:06 am Ethan A Merritt wrote:
Rmerge is an average over replicate measurements of the intensity for
identical [hkl]. Rsym is an average over the measurements for all
symmetry
alf Of
Chris Putnam
Sent: Friday, January 18, 2008 1:21 PM
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] differences between Rsym and Rmerge
On Friday 18 January 2008 09:30:06 am Ethan A Merritt wrote:
Rmerge is an average over replicate measurements of the intensity for
identical [hkl]
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Subject: Re: [ccp4bb] differences between Rsym
46
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Chris Putnam wrote:
I won't belabor this point (or defend this view) any further,
though I will repeat my surprise at the lack of a clear
consensus for what Rsym and Rmerge actually mean,
as opposed to things like I/sigma, for example.
I/sigma is also open to interpretation. Is it / or
(av
On Fri, 18 Jan 2008, Edwin Pozharski wrote:
So Rmerge does tell you something, but only in context with all the
other information.
this is what Whewell termed the consilience of inductions in the 19th
century (which others have expanded since).
-bryan
On Friday 18 January 2008 11:18:45 am Mischa Machius wrote:
> OK, that brings us back to a more substantial question: is any of
> these R values actually suitable to judge the quality of a given
> dataset? Instead of introducing novel R factors, one could also simply
> ignore them altogether,
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Subject: Re: [ccp4bb] differences between Rsym and Rmerge
On Friday 18 January 2008 09:30:06
ailto:[EMAIL PROTECTED] On Behalf Of
Chris Putnam
Sent: Friday, January 18, 2008 1:21 PM
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] differences between Rsym and Rmerge
On Friday 18 January 2008 09:30:06 am Ethan A Merritt wrote:
Rmerge is an average over replicate measurements of the intensit
ECTED]
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Subject: Re: [ccp4bb] differences between Rsym and Rmerge
On Friday 18 January 2008 09:30:06 am Ethan A Merritt
My understanding is(was) that Rsym refers to the merging of
symmetry-related reflections during scaling whereas Rmerge refers,
broadly, to any data merging process, but originally means merging of
reflection with the same (hkl). Rcryst then should refer to the merging
of data from different cry
On Friday 18 January 2008 09:30:06 am Ethan A Merritt wrote:
>
> Rmerge is an average over replicate measurements of the intensity for
> identical [hkl]. Rsym is an average over the measurements for all symmetry
> equivalent reflections.
>
> In the presence of anomalous scattering, Rsym will be hig
On Friday 18 January 2008 07:50, Santarsiero, Bernard D. wrote:
> I do recall Rmerge being more popular with the small molecule
> crystallographers. However, I also recall a difference between averaging
> over pairs of reflections that were or were not Bijvoet pairs, for even
> small differences i
I had learned that Rsym compared symmetry-related reflections within an
image or film (in the context of a rotation exposure), and Rmerge compared
symmetry-related reflections on different images or films with one
another.
Is that wrong?
Bill
Manfred S. Weiss wrote:
> Dear Mohd and all others,
I seem to recall hearing Rsym first when I used the Xuong-Hamlin detector,
since there were a substantial number of redundancies. There were two
Rsyms, one called Rrms for the sqrt over the sum of weighted squared
differences and and Rav for the linear summation of unweighted
differences. This was
Dear Mohd and all others,
Well, I guess it is time again to define and talk about R-factors.
The term R_sym goes back to the times, when X-ray data were
recorded by precession photography on film. Except for the central
cone, each reflection was observed only once and R_sym described
the agreemen
Kay,
I beg to differ, but only in a pedantic way. Historically, Rsym
would refer to the agreement in symmetry-related reflections within a
single data set and Rmerge would be the agreement between 2 or more
data sets that were merged. This was the way we did it back in the
"old day" of
Hi Mohammed,
you've put the finger on a weak point in reporting crystallographic
statistics ;-). The use of Rmerge and Rsym differs wi(l)dely amongst
crystallographers. In my opinion, Rsym should be reported for the
single crystal internal symmetry R-factor between symmetry-equivalent
ref
Salameh, Mohd A., Ph.D. schrieb:
Hi everybody!
I will appreciate it if anybody can clarify to me the differences
between Rmerge and Rsym. Many thanks, M
there is no difference - unfortunately there are two words for the same
thing. "Rmerge" currently appears to be more in fashion.
just m
Hi everybody!
I will appreciate it if anybody can clarify to me the differences
between Rmerge and Rsym. Many thanks, M
Mohammed A. Salameh, Ph.D.
Mayo Clinic Cancer Center
Griffin Cancer Research Building
4500 San Pablo Road
Jacksonville, FL 32
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