Data Item _reflns.pdbx_absDiff_over_sigma_anomalous
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General 
- Item name
- _reflns.pdbx_absDiff_over_sigma_anomalous
- Category name
- reflns
- Attribute name
- pdbx_absDiff_over_sigma_anomalous
- Required in PDB entries
- no
- Used in current PDB entries
- Yes, in about 0.02 % of entries
Item Description
The overall mean ratio of absolute anomalous intensity
differences to their standard deviation within the
sphere defined by the diffraction limits
(_reflns.d_resolution_high and
_reflns.d_resolution_low) and using data for which
intensities for both instances of a Friedel pair are
available for an acentric reflection.
|Dano|
-------------
sigma(Dano)
with
Dano = I(+) - I(-)
sigma(Dano) = sqrt( sigma(I(+))2 + sigma(I(-))2 )
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 |
|---|---|---|
| _reflns.gphl_absDiff_over_sigma_anomalous | gphl-proc-anomalous-stats-extension.dic | 0.0 |