International
Tables for
Crystallography
Volume G
Definition and exchange of crystallographic data
Edited by J. R. Hester and B. McMahon

International Tables for Crystallography (2026). Vol. G. Early view chapter
https://doi.org/10.1107/97809553602060001011

Chapter 4.2 Core dictionary (coreCIF)


Index

Core dictionary version 3.3.0

_refine_ls.wR_factor_gt

Name:
_refine_ls.wR_factor_gt

Aliases:

_refine_ls_wR_factor_obs
_refine.ls_wR_factor_obs
_refine_ls_wR_factor_gt

Definition:

   
    Weighted residual factors for significantly intense reflections
    (satisfying _reflns.threshold_expression) included in the refinement.
    The reflections must also satisfy the resolution limits established by
    _refine_ls.d_res_high and _refine_ls.d_res_low.

       ( sum w [ Y(meas_gt) - Y(calc) ]^2^  )^1/2^
      wR = ( ---------------------------------- )
       (         sum w Y(meas_gt)^2^        )

    Y(meas_gt) = the 'observed' amplitude _refine_ls.structure_factor_coef
    Y(calc)    = the calculated amplitude _refine_ls.structure_factor_coef
      w        = the least-squares weight
      and the sum is taken over the specified reflections.

Type: Real

Units: none


The permitted range is 0.0 → infinity

Category:
refine_ls








































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