Data Item _refine.ls_R_factor_R_free
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General 
- Item name
- _refine.ls_R_factor_R_free
- Category name
- refine
- Attribute name
- ls_R_factor_R_free
- Required in PDB entries
- no
- Used in current PDB entries
- Yes, in about 81.5 % of entries
Item Description
Residual factor R for 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.
sum|Fobs - Fcalc|
R = ---------------------
sum|Fobs|
Fobs = the observed structure-factor amplitudes
Fcalc = the calculated structure-factor amplitudes
sum is taken over the specified reflections
Additional Descriptive Information for Depositors
Sum(abs((abs(F-obs)-abs(F-calc)))/Sum(abs(F-obs)) on pre-allocated cross-validation testing data that were not used in structure solution process
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]+)?
Allowed Boundary Conditions
| Minimum Value | Maximum Value |
|---|---|
| 0.0 | 1.0 |
Advisory Boundary Conditions
| Minimum Value | Maximum Value |
|---|---|
| 0.1 | 0.4 |
Related Items 
| Related Item Name | Relation Type |
|---|---|
| _refine.ls_wR_factor_R_free | alternate |
| _refine.ls_R_factor_R_free_error | associated_error |