Data Item _refine_ls_shell.number_reflns_R_free
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General 
- Item name
- _refine_ls_shell.number_reflns_R_free
- Category name
- refine_ls_shell
- Attribute name
- number_reflns_R_free
- Required in PDB entries
- no
- Used in current PDB entries
- Yes, in about 74.0 % 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. Details of how reflections were assigned to the
working and test sets are given in _reflns.R_free_details.
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
Data Type 
- Data type code
- int
- Data type detail
- int item types are the subset of numbers that are the negative or positive integers.
- Primitive data type code
- numb
- Regular expression
- [+-]?[0-9]+
Allowed Boundary Conditions
| Minimum Value | Maximum Value |
|---|---|
| 0 | +∞ |
Advisory Boundary Conditions
| Minimum Value | Maximum Value |
|---|---|
| 1 | 2000 |