I am little curious about the anisotropically truncated data for 3RKO:
Percent Possible(All) 96.0
Mean I Over Sigma(Observed) 0.8
In the supplementary table of the nature paper it was made clear that this
3.16-3.0A, I/sigmaI=0.8 and Rmerge=1.216 shell was the outer shell of the
anisotropically truncated data. The authors did also report the
isotropically truncated resolution to be 3.2A with I/sigmaI=1.3 and
Rmerge=73%.
The authors also stated in the main text that
"the best native data set was anisotropically scaled and truncated to 3.4 Å,
3.0 Å and 3.0 Å resolution, where the F/σ ratio drops to ~2.6–2.8 along
the a*, b* and c* axes, respectively (scaling 2, Supplementary Table 1)"
My question is, is the I/sigmaI=0.8 a consequence of many reflections with
nearly 0 I/sigmaI being included in the calculation? Then what does the 96%
completeness mean? Does it mean that 96% completeness in the spherical shell
of 3.16-3.0A was achieved, by including a great number of I=0 reflections?
Zhijie
--------------------------------------------------
From: "Edward A. Berry" <[log in to unmask]>
Sent: Thursday, May 31, 2012 2:59 PM
To: <[log in to unmask]>
Subject: Re: [ccp4bb] Death of Rmerge
> Yes! I want a copy of this program RESCUT.
>
> REMARK 200 R SYM FOR SHELL (I) : 1.21700
> I noticed structure 3RKO reported Rmerge in the last shell greater
> than 1, suggesting the police who were defending R-merge were fighting
> a losing battle. And this provides a lot of ammunition to those
> they are fighting.
>
> Jacob Keller wrote:
>> Dear Crystallographers,
>>
>> in case you have not heard, it would appear that the Rmerge statistic
>> has died as of the publication of PMID: 22628654. Ding Dong...?
>>
>> JPK
>>
>> --
>> *******************************************
>> Jacob Pearson Keller
>> Northwestern University
>> Medical Scientist Training Program
>> email: [log in to unmask]
>> *******************************************
>>
