**Definition:**

Residual factor R(I) for reflections that satisfy the resolution limits established by _refine.ls_d_res_high and _refine.ls_d_res_low and the observation limit established by _reflns.observed_criterion, calculated on the estimated reflection intensities. 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 sum is taken over the specified reflections

**Type:** float

**Mandatory item:** no

The permitted range is [0.0, infinity)

**Category:** refine

Copyright © 2005 International Union of Crystallography