Dear George, you may also want to take into account that the variation of Rfree is estimated as Rfree^2/k, where k is the number of reflections in the shell. If you only have e.g. 100 reflections there, this might simply a statistical fluctuation, as far as I understand. Cheers, Tim On 01/26/2015 10:05 PM, George Devaniranjan wrote:
Hi,
I calculated/validated several PDB structures in Phenix.Validation (GUI)
The R/R-free (overall) is
0.1271/0.1348
Further down I looked at the R/R-free for the highest resolution shell.
Its 0.2538/0.2446
I am curious why the R-free for the *highest resolution shell* seems to be LOWER than R (work).
Am I reading the information wrong?
PDB: 3QL9
Thank you, George
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