[phenixbb] "Negative reflections" (previously Are sigma cutoffs for R-free reflections cheating?)
Ed Pozharski
epozh001 at umaryland.edu
Mon Dec 7 07:25:10 PST 2009
Sacha,
No, it won't. I believe Pavel and I agree that assigning zero
amplitudes to negative intensity reflections is wrong. The question is
should such reflections be excluded from refinement *if* the mistake has
already been made. My uneducated guess is that Pavel believes that this
will have undetectable effect on a final model. I am, as usual,
clueless.
Privet,
Ed.
On Sat, 2009-12-05 at 08:06 +0100, Alexandre OURJOUMTSEV wrote:
> Hi, Ed and Pavel,
>
> > No, of course. I was just wondering how better (and what is
> > "better" in this case) the refinement results will be if one
> includes the
> > negative (zero) reflections into the process of refinement, and did
> > anyone clearly demonstrate it.
>
> Can the work below help your discussion?
>
> Best regards,
>
> Sacha
>
> =============
> Acta Cryst. (1978). A34, 517-525 [ doi:10.1107/S0567739478001114 ]
>
>
> On the treatment of negative intensity observations
> S. French and K. Wilson
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--
Edwin Pozharski, PhD, Assistant Professor
University of Maryland, Baltimore
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