Ethan is right.
I also have compiled a few estimates how to get to this number 
pp638 ff 'Estimating the restraint count' in BMC

Best, BR

-----Original Message-----
From: CCP4 bulletin board [mailto:[email protected]] On Behalf Of Ethan A 
Merritt
Sent: Tuesday, June 03, 2014 11:44 AM
To: [email protected]
Subject: Re: [ccp4bb] Observations-to-parameter ratio in Refmac

On Tuesday, 03 June, 2014 17:02:56 Klaus F tterer wrote:

> Does someone know whether Refmac outputs the 
> observations-to-parameters ratio or, failing that, the number of refined 
> parameters in the log file?
> 
> Klaus

This turns out to be much more complex than you might think.
See:

  "To B or not to B: a question of resolution?" Acta Cryst. D68, 468-477.
        http://scripts.iucr.org/cgi-bin/paper?S0907444911028320

--
Ethan A Merritt
Biomolecular Structure Center,  K-428 Health Sciences Bldg
MS 357742,   University of Washington, Seattle 98195-7742

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