[phenixbb] question on f/sigf

Nathaniel Echols nechols at lbl.gov
Fri Jul 13 15:36:41 PDT 2012


On Fri, Jul 13, 2012 at 2:25 PM, <fn1 at rice.edu> wrote:

> I am wondering why f/sigf is always about twice of i/sigi. Is there any
> mathematics behind this relation? Maybe it is not directly related to
> phenix, but i sincerely hope someone could help me with it.
>

I don't know the logic behind this, but from notes in our code, the default
implementation appears to be this one:

http://www.iucr.org/__data/iucr/cif/software/xtal/xtal372htmlman/html/addref-desc.html


specifically, section 4.5.2.4.

-Nat
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