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
- Used in current PDB entries
- Yes, in about 79.9 % 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
(i.e. excluded from refinement) reflections when refinement
included 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 crystallographically unique reflections that satisfy the resolution limit established by high and low resolution cut-offs, the observation limit established by sigma(F) or sigma(I) cut-offs, and that were excluded from refinement for cross-validation in a "free" R-factor set.Details of how reflections were assigned to the working and test sets are given in R-free selection details.
Additional Item Example for Depositors1
150
Additional Item Example for Depositors2
256
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 | +∞ |