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

# _refine_ls_R_I_factor

**Name:**

`'_refine_ls_R_I_factor'`

**Definition:**

Residual factor R(I) for significantly intense reflections (satisfying _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 specified reflections

The permitted range is 0.0 -> infinity

**Type:** numb

**Category:** refine