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
- 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
(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.
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
Residual factor R for reflections that satisfy the resolution and observation limits and that were excluded from refinement to be used for cross validation in a "free" R-factor set.Details of how reflections were assigned to the working and test sets can be given in R-free selection details data item.
Additional Item Example for Depositors1
0.339
Additional Item Example for Depositors2
0.230
Data Type 
- Data type code
- float
- Data type detail
- int 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 | +∞ |
Related Items 
| Related Item Name | Relation Type |
|---|---|
| _refine.ls_wR_factor_R_free | alternate |
| _refine.ls_R_factor_R_free_error | associated_error |