Data Item _refine.ls_number_reflns_R_free
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General 
- Item name
- _refine.ls_number_reflns_R_free
- Category name
- refine
- Attribute name
- ls_number_reflns_R_free
- Required in PDB entries
- no
- Used in current PDB entries
- Yes, in about 82.9 % of entries
Item Description
The number of reflections that satisfy the resolution limits
established by _refine.ls_d_res_high and _refine.ls_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
The number of reflections that satisfy both resolution limits and observation criterion, and that were pre-allocated as the cross-validation test reflections. 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 |
|---|---|
| 40 | 16000 |