2 Apr
2010
2 Apr
'10
10:08 p.m.
Edward A. Berry wrote:
sigma(Rfree)/Rfree ~ 1/sqrt(Ntest)
I believe "~" here is read "proportional to", not "approximately".
No, seems it should be "approximately": "Interestingly, the standard deviation of the free R value is approximately given by Rfree/(n)^1/2, where n is the number of reflections in the test set." Free R Value: Cross-Validation in Crystallography - AXEL T. BRUNGER METHODS IN ENZYMOLOGY, VOL. 277