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Item _reflns_class.R_Fsqd_factor


Description 

              For each reflection class, the residual factor R(F^2^) calculated
               on the squared amplitudes of the observed and calculated
               structure factors for the reflections judged significantly
               intense (i.e. satisfying the threshold specified by
               _reflns.threshold_expression) and included in the refinement.

               The reflections also satisfy the resolution limits established
               by _reflns_class.d_res_high and _reflns_class.d_res_low.

                          sum | F(obs)^2^ - F(calc)^2^ |
               R(Fsqd) = -------------------------------
                                  sum F(obs)^2^

               F(obs)^2^  = squares of the observed structure-factor amplitudes
               F(calc)^2^ = squares of the calculated structure-factor
                            amplitudes

               and the sum is taken over the reflections of this class.

Category

reflns_class

Mandatory Code

no

Data Type Code

float

Enumeration Range

Minimum Value Maximum Value
0.0 0.0
0.0 n.a.

Alias Names

Alias Name Dictionary Version
_reflns_class_R_Fsqd_factor cif_core.dic 2.3

 

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