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International
Tables for Crystallography Volume G Definition and exchange of crystallographic data Edited by J. R. Hester and B. McMahon © International Union of Crystallography 2026 |
International Tables for Crystallography (2026). Vol. G. Early view chapter
https://doi.org/10.1107/97809553602060001011 Chapter 4.2 Core dictionary (coreCIF) |
Core dictionary version 3.3.0
_reflns_class.R_Fsqd_factor
Name:_reflns_class.R_Fsqd_factor
Alias:
_reflns_class_R_Fsqd_factor
Definition:
Residual factor R(F^2^) for reflections in this class judged
significantly intense (i.e. greater than required by the
_reflns.threshold_expression) and included in the refinement.
sum | F(meas_gt)^2^ - F(calc)^2^ |
R(Fsqd gt) = ------------------------------------
sum F(meas_gt)^2^
F(meas_gt)^2^ = square of the 'observed' structure factors
F(calc )^2^ = square of the calculated structure factors
and the sum is taken over the specified reflections.
Type: Real
Units: none
The permitted range is 0.0 → infinity
Category:
reflns_class
