Re: [phenixbb] Are sigma cutoffs for R-free reflections cheating?

Hi Ed,

AFAIU, Joe is referring to the situation where negative intensities are converted to FOBS=0.

thanks for making this statement clear. I see now what Joe meant.

Ignoring them would allow refinement to have any FCALC for these reflections when in fact we do have some information about them. I am not aware of any systematic study of this question, but it *seems* rather obvious that ignoring zero reflections is a wrong thing to do *in these circumstances*.

Reference, please -:) "Rather obvious" doesn't count for me -:) Thanks! Pavel.