Data Item _reflns.R_free_details
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General 
- Item name
- _reflns.R_free_details
- Category name
- reflns
- Attribute name
- R_free_details
- Required in PDB entries
- Used in current PDB entries
- Yes, in about 0.003 % of entries
Item Description
A description of the method by which a subset of reflections was
selected for exclusion from refinement so as to be used in the
calculation of a "free" R factor.
Additional Descriptive Information for Depositors
A description of the method by which a subset of reflections was selected for the calculation of a "free" R-factor.
Item Example
The data set was sorted with l varying most
rapidly and h varying least rapidly. Every
10th reflection is this sorted list was
excluded from refinement and included in the
calculation of a "free" R factor.
Additional Item Example for Depositors
The data set was sorted with l varying most
rapidly and h varying least rapidly. Every
10th reflection is this sorted list was
excluded from refinement and included in the
calculation of a "free" R-factor.
Data Type 
- Data type code
- text
- Data type detail
- text item types / multi-line text ...
- Primitive data type code
- char
- Regular expression
- [][ \n\t()_,.;:"&<>/\{}'`~!@#$%?+=*A-Za-z0-9|^-]*