Data Item _refine.ls_R_I_factor_obs
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General 
- Item name
- _refine.ls_R_I_factor_obs
- Category name
- refine
- Attribute name
- ls_R_I_factor_obs
- Required in PDB entries
- no
- Used in currrent PDB entries
- No
Item Description
Residual factor R(I) 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, calculated on the estimated
reflection intensities.
This is most often calculated in Rietveld refinements against
powder data, where it is referred to as RB or RBragg.
sum|Iobs - Icalc|
R(I) = ---------------------
sum|Iobs|
Iobs = the net observed intensities
Icalc = the net calculated intensities
sum is taken over the specified reflections
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 | +∞ |
Aliases
| Alias Item Name | Dictionary Name | Dictionary Version |
|---|---|---|
| _refine_ls_R_I_factor | cif_core.dic | 2.0.1 |