Data Item _refine.overall_SU_R_Cruickshank_DPI


Item name
Category name
Attribute name
Required in PDB entries
Used in current PDB entries
Yes, in about 5.9 % of entries

Item Description

The overall standard uncertainty (estimated standard deviation) of the displacement parameters based on the crystallographic R value, expressed in a formalism known as the dispersion precision indicator (DPI). The overall standard uncertainty (sigmaB) gives an idea of the uncertainty in the B values of averagely defined atoms (atoms with B values equal to the average B value). N_a (sigma_B)2 = 0.65 --------- (R_value)2 (D_min)2 C(-2/3) (N_o-N_p) N_a = number of atoms N_o = number of reflections included in refinement N_p = number of refined parameters R_value = conventional crystallographic R value D_min = maximum resolution C = completeness of data Ref: Cruickshank, D. W. J. (1999). Acta Cryst. D55, 583-601. Murshudov, G. N. & Dodson, E. J. (1997). Simplified error estimation a la Cruickshank in macromolecular crystallography. CCP4 Newsletter on Protein Crystallography, No. 33, January 1997, pp. 31-39.

Data Type

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


Alias Item Name Dictionary Name Dictionary Version
_refine.ebi_Overall_ESU_R_Cruickshanks_DPI ebi_extensions 1.0