Data Item _refine_ls_shell.percent_reflns_R_free
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General 
- Item name
- _refine_ls_shell.percent_reflns_R_free
- Category name
- refine_ls_shell
- Attribute name
- percent_reflns_R_free
- Required in PDB entries
- no
- Used in current PDB entries
- Yes, in about 11.9 % of entries
Item Description
The number of reflections that satisfy the resolution limits
established by _refine_ls_shell.d_res_high and
_refine_ls_shell.d_res_low and the observation limit
established by _reflns.observed_criterion, and that were used
as the test reflections (i.e. were excluded from the refinement)
when the refinement included the calculation of a 'free'
R factor, expressed as a percentage of the number of
geometrically observable reflections that satisfy the
reflection limits.
Additional Descriptive Information for Depositors
Within the indicated shell, the number of reflections that satisfy both resolution limits and observation criterion, and that were used pre-allocated as the cross-validation test reflections before a structure solution process. These data were not used in the structure solution and refinement process and were used to calculate the 'free' R factor. In percentage to the overall reflections used for refinement.
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 |
|---|---|
| 1 | 12 |