Describes CIF, the data exchange standard of crystallography. Provides: information for scientists who wish to record or use the results of a single-crystal or powder diffraction experiment; the data ontology necessary for designing interoperable computer applications; accompanying software including machine-readable CIF dictionaries, libraries and utility programs.
An essential guide and reference to CIF for programmers, data managers handling crystal-structure information and practising crystallographers.
This definition has been superseded and is retained here only for archival purposes. Use instead '_refine_ls_wR_factor_gt'
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