Data Item _refine.pdbx_average_fsc_overall
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General 
- Item name
- _refine.pdbx_average_fsc_overall
- Category name
- refine
- Attribute name
- pdbx_average_fsc_overall
- Required in PDB entries
- no
- Used in current PDB entries
- Yes, in about 0.02 % of entries
Item Description
Overall average Fourier Shell Correlation (avgFSC) between model and
observed structure factors for all reflections.
The average FSC is a measure of the agreement between observed
and calculated structure factors.
sum(Ni FSCi)
avgFSC = ----------------
sum(Ni)
Ni = the number of all reflections in the resolution shell i
FSCi = FSC for all reflections in the i-th resolution shell calculated as:
(sum(|Fo| |Fc| fom cos(phic-phio)))
FSCi = -------------------------------------------
(sum(|Fo|2) (sum(|Fc|2)))1/2
|Fo| = amplitude of observed structure factor
|Fc| = amplitude of calculated structure factor
phio = phase of observed structure factor
phic = phase of calculated structure factor
fom = figure of merit of the experimental phases.
Summation of FSCi is carried over all reflections in the resolution shell.
Summation of avgFSC is carried over all resolution shells.
Ref: Rosenthal P.B., Henderson R.
"Optimal determination of particle orientation, absolute hand,
and contrast loss in single-particle electron cryomicroscopy.
Journal of Molecular Biology. 2003;333(4):721-745, equation (A6).
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]+)?