# Core CIF Dictionary version 2.3

# _refine_ls_wR_factor_obs

### Name

`'_refine_ls_wR_factor_obs'`
**Category:** refine

**Data type:** numb

**Related item:** `'_refine_ls_wR_factor_gt'`

**Related function:** replace

**Enumeration range:** 0.0 -> infinity

### Definition

Weighted residual factors for the reflections classified as
'observed' (see _reflns_observed_criterion) and included
in the refinement. The reflections also satisfy the resolution
limits established by _refine_ls_d_res_high and
_refine_ls_d_res_low. See also the _refine_ls_R_factor_
definitions.
( 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
and the sum is taken over the specified reflections

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