Dear Rakesh, dear Artem,

Since the initial question is not precise (which kind of comments are expected?)  I may mention that the most frequent values of R, Rfree and DeltaR (that is asked about) are given in our work published in 2009 in Acta Cryst., D65, 1283-1291. Interestingly, they are practically linear functions of log(resolution). The plots show also the statistics of deviation from these lines.

Best regards,

Sacha Urzhumtsev

Universities of Strasbourg & Nancy

De : CCP4 bulletin board [mailto:[log in to unmask]] De la part de Artem Evdokimov
Envoyé : mardi 26 octobre 2010 03:36
À : [log in to unmask]
Objet : Re: [ccp4bb] diverging Rcryst and Rfree

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as well as some notes in the older posts :)

As a very basic rule of thumb, Rfree-Rwork tends to be around Rmerge for the dataset for refinements that are not overfitted.

Artem

On Mon, Oct 25, 2010 at 4:10 PM, Rakesh Joshi <[log in to unmask]> wrote:

Hi all,

Can anyone comment, in general, on diverging Rcryst and Rfree values(say>7%) for
structures with kind of low resolutions(2.5-2.9 angstroms)?

Thanks
RJ