migration.indices (version 0.3.1)

migration.connectivity: Migration Connectivity Index

Description

The Migration Connectivity Index measures "the proportion of the total number of potential interregional flows which are not zero": $$I_{MC} = \sum_i \sum_{j \neq i} \frac{MC_{ij}}{n(n-1)}$$ where \(MC_{ij}\) is 0 if the flow from \(i\) to \(j\) is zero and let it be 1 otherwise.

Usage

migration.connectivity(m)

Arguments

m

migration matrix

Value

A number between 0 and 1 where zero shows no connections between regions.

References

• M. Bell, M. Blake, P. Boyle, O. Duke-Williams, P. Rees, J. Stillwell and G. Hugo (2002) Cross-National Comparison of Internal Migration. Issues and Measures. Journal of the Royal Statistical Society. Series A (Statistics in Society) 165, 435--464

Examples

# NOT RUN {
data(migration.hyp)
migration.connectivity(migration.hyp)
data(migration.world)
migration.connectivity(migration.world)
# }