Dear Deb,
R_meas or R_rim is a merging R-factor which is independent of the
redundancy or multiplicity of the data (hence its name), R_pim
stands for precision indicating merging R-factor. R_pim
gives you the precision of the averaged measurement, which is
the one you are actually using for structure solution and refinement.
SCALA will calculate both R_rim (R_meas) and R_pim, XDS/XSCALE
will calculate R_rim (R_meas) only, and SCALEPACK neither of the
two. However, you may produce a file from SCALEPACK with scaled
but unmerged intensities (option NO MERGE ORIGINAL INDEX)
and then download a program from my site called RMERGE or
RMERGE_4LINUX, which will do the job for you.
If you have further questions, please see the page
http://www.embl-hamburg.de/~msweiss/projects/msw_qual.html
or ask me.
Cheers, Manfred
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On Sat, 6 Dec 2008, Debajyoti Dutta wrote:
>
Dear members,
I have a little query hare about Rpim and Rmeans. How these are used to mark data quality, and how can one calculate it.
Thak you for your reply in advance.
Sincerely
Deb
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