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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
_refine_ls.number_parameters
Name:_refine_ls.number_parameters
Aliases:
_refine_ls_number_parameters
_refine.ls_number_parameters
Definition:
The number of parameters refined in the least-squares process. If
possible this number should include the restrained parameters.
The restrained parameters are distinct from the constrained
parameters (where one or more parameters are linearly dependent
on the refined value of another). Least-squares restraints
often depend on geometry or energy considerations and this
makes their direct contribution to this number, and to the
goodness-of-fit calculation, difficult to assess.
Type: Integer
Units: none
The permitted range is 0 → infinity
Category:
refine_ls
