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Item _phasing_MIR_der.R_cullis_acentric
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Description
Residual factor R~cullis,acen~ for acentric reflections in this
derivative.
The Cullis R factor was originally defined only for centric
reflections. It is, however, also a useful statistical
measure for acentric reflections, which is how it is used in
this data item.
sum| |Fph~obs~ +/- Fp~obs~| - Fh~calc~ |
R~cullis,acen~ = ----------------------------------------
sum|Fph~obs~ - Fp~obs~|
Fp~obs~ = the observed structure factor amplitude of the native
Fph~obs~ = the observed structure factor amplitude of the
derivative
Fh~calc~ = the calculated structure factor amplitude from the
heavy atom model
sum is taken over the specified reflections
Ref: Cullis, A. F., Muirhead, H., Perutz, M. F., Rossmann, M. G.
& North, A. C. T. (1961). Proc. Roy. Soc. A265, 15-38.
Category
phasing_mir_der
Mandatory Code
no
Data Type Code
float
Enumeration Range
Minimum Value |
Maximum Value |
0.0 |
n.a. |
0.0 |
0.0 |
Alias Names
Alias Name |
Dictionary |
Version |
_phasing_MIR_der.ebi_Rcullis_acentric |
ebi_extensions |
1.0 |
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