As "the coefficient of variation is defined as the standard deviation to mean ratio of a distribution", the In-migration Coefficient of Variation is computed by dividing the standard deviation (with the nominator being n instead of n-1) of the in-migration flows by the mean.
A numeric vector of standardized values where a higher (\neq 0) shows more spatial focus.
Andrei Rogers and Stuart Sweeney (1998) Measuring the Spatial Focus of Migration Patterns. The Professional Geographer 50, 232–242
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