For each reflection class, the weighted residual factor for all
reflections included in the refinement. The reflections also
satisfy the resolution limits established by
_refine_ls_class.d_res_high and _refine_ls_class.d_res_low.
See also the _refine_ls_class.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 reflections of this class.