Data Item _refine_hist.R_factor_R_free
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General 
- Item name
- _refine_hist.R_factor_R_free
- Category name
- refine_hist
- Attribute name
- R_factor_R_free
- Required in PDB entries
- no
- Used in currrent PDB entries
- No
Item Description
Residual factor R for reflections that satisfy the resolution
limits established by _refine_hist.d_res_high and
_refine_hist.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
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 | +∞ |