Data Item _refine.pdbx_overall_SU_R_free_Blow_DPI
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General 
- Item name
- _refine.pdbx_overall_SU_R_free_Blow_DPI
- Category name
- refine
- Attribute name
- pdbx_overall_SU_R_free_Blow_DPI
- Required in PDB entries
- no
- Used in current PDB entries
- Yes, in about 3.1 % of entries
Item Description
The overall standard uncertainty (estimated standard deviation)
of the displacement parameters based on the crystallographic
R-free value, expressed in a formalism known as the dispersion
precision indicator (DPI).
Ref: Blow, D (2002) Acta Cryst. D58, 792-797
Additional Descriptive Information for Depositors
Precision index (DPI) by Blow to estimate the precision of coordinates obtained by structural refinement of protein diffraction data.
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]+)?