**Definition:**

Weighted residual factor wR for reflections that satisfy the resolution limits established by _refine_ls_shell.d_res_high and _refine_ls_shell.d_res_low and the observation limit established by _reflns.observed_criterion, and that were used as the test reflections (i.e. were excluded from the refinement) when the refinement included the calculation of a 'free' R factor. Details of how reflections were assigned to the working and test sets are given in _reflns.R_free_details. ( sum|w |Y~obs~ - Y~calc~|^2^| )^1/2^ wR = ( ---------------------------- ) ( sum|w Y~obs~^2^| ) Y~obs~ = the observed amplitude specified by _refine.ls_structure_factor_coef Y~calc~ = the calculated amplitude specified by _refine.ls_structure_factor_coef w = the least-squares weight sum is taken over the specified reflections

**Type:** float

**Mandatory item:** no

The permitted range is [0.0, infinity)

**Related item: **_refine_ls_shell.R_factor_R_free (alternate)

**Category:** refine_ls_shell

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