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Item _reflns_class.R_I_factor


Description 

              For each reflection class, the residual factor R(I) for the
               reflections judged significantly intense (i.e. satisfying the
               threshold specified by _reflns.threshold_expression) and
               included in the refinement.

               This is most often calculated in Rietveld refinements
               against powder data, where it is referred to as R~B~ or R~Bragg~.

                       sum | I(obs) - I(calc) |
               R(I) =  ------------------------
                              sum | I(obs) |

               I(obs)  = the net observed intensities
               I(calc) = the net calculated intensities

               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_I_factor cif_core.dic 2.3

 

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