Data Item _refine.correlation_coeff_Fo_to_Fc_free

General

Item name
_refine.correlation_coeff_Fo_to_Fc_free
Category name
refine
Attribute name
correlation_coeff_Fo_to_Fc_free
Required in PDB entries
no
Used in current PDB entries
Yes, in about 39.2 % of entries

Item Description

The correlation coefficient between the observed and calculated structure factors for reflections not included in the refinement (free reflections). The correlation coefficient is scale-independent and gives an idea of the quality of the refined model. sumi(Foi Fci - <Fo><Fc>) Rcorr = ------------------------------------------------------------ SQRT{sumi(Foi)2-<Fo>2} SQRT{sumi(Fci)2-<Fc>2} Fo = observed structure factors Fc = calculated structure factors <> denotes average value summation is over reflections not included in the refinement (free reflections)

Data Type

Data type code
float
Data type detail
float item types are the subset of numbers that are the floating numbers.
Primitive data type code
numb
Regular expression
-?(([0-9]+)[.]?|([0-9]*[.][0-9]+))([(][0-9]+[)])?([eE][+-]?[0-9]+)?

Advisory Boundary Conditions

Minimum Value Maximum Value
0.8 1
0 1