Data Item _phasing_MIR_der.R_cullis_acentric


Item name
Category name
Attribute name
Required in PDB entries
Used in current PDB entries
Yes, in about 0.008 % of entries

Item Description

Residual factor Rcullis,acen for acentric reflections for this derivative. The Cullis R factor was originally defined only for centric reflections. It is, however, also a useful statistical measure for acentric reflections, which is how it is used in this data item. sum| |Fphobs +/- Fpobs| - Fhcalc | Rcullis,acen = ---------------------------------------- sum|Fphobs - Fpobs| Fpobs = the observed structure-factor amplitude of the native Fphobs = the observed structure-factor amplitude of the derivative Fhcalc = the calculated structure-factor amplitude from the heavy-atom model sum is taken over the specified reflections Ref: Cullis, A. F., Muirhead, H., Perutz, M. F., Rossmann, M. G. & North, A. C. T. (1961). Proc. R. Soc. London Ser. A, 265, 15-38.

Data Type

Data type code
Data type detail
float item types are the subset of numbers that are the floating numbers.
Primitive data type code
Regular expression

Allowed Boundary Conditions

Minimum Value Maximum Value