##### Core dictionary (coreCIF) version 2.3.1

# _reflns_class_R_I_factor

**Name:**

`'_reflns_class_R_I_factor'`

**Definition:**

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.

Appears in list containing _reflns_class_code

The permitted range is 0.0 -> infinity

**Type:** numb

**Category:** reflns_class