migration.connectivity {migration.indices}

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

data(migration.hyp)
migration.connectivity(migration.hyp)
data(migration.world)
migration.connectivity(migration.world)