On Fri, Apr 4, 2014 at 1:57 AM, Tim Gruene <t...@shelx.uni-ac.gwdg.de> wrote:

> A more up-to-date reason is that programs calculate R values very
> differently. If you take a PDB file refined with program X and put it
> into program Y you easily get discrepancies greater than 5%.
>

This is actually pretty rare - usually it's only 1-2% at most.
Discrepancies like 16.5% versus 30.9% usually indicate that there's
something wrong or misleading in the annotation of the entry, and often
mean that you can't even reproduce the R-factor with the specified program.

-Nat

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