[phenixbb] A couple of questions regarding twinning

Pavel Afonine PAfonine at lbl.gov
Thu Jun 3 09:17:47 PDT 2010

Hi Owen,

> On a related note, how is the R factor calculated with twinned 
> structures (i.e., how is Fcalc determined for the purposes of R factor 
> calculation)?  

here are the formulas that are used in phenix.refine, 
phenix.model_vs_data and other related tools for the R-factor and total 
model structure factor Fmodel:



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