Data Item _refine.correlation_coeff_I_to_Fcsqd_work
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General 
- Item name
- _refine.correlation_coeff_I_to_Fcsqd_work
- Category name
- refine
- Attribute name
- correlation_coeff_I_to_Fcsqd_work
- Required in PDB entries
- no
- Used in current PDB entries
- No
Item Description
The Pearson correlation coefficient between the observed (merged)
intensities and the intensities calculated from a model for reflections
included in the refinement (work reflections).
The correlation coefficient is scale-independent and gives
an idea of the quality of the refined model.
<Io Ic> - <Io> <Ic>
Corr = ----------------------------------------------
SQRT{<Io2>-<Io>2} SQRT{<Ic2>-<Ic>2}
Io = observed intensities
Ic = |Fc|2 = calculated intensities
<> denotes the average value, where the average is taken over
the reflections included in the refinement (work 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 |
|---|---|
| -1.0 | 1.0 |
Advisory Boundary Conditions
| Minimum Value | Maximum Value |
|---|---|
| 0,5 | 1.0 |