migration.indices (version 0.3.0)

migration.gini.exchange.standardized: Standardized Exchange Gini Index

Description

The standardized version of the Exchange Gini Index (migration.gini.exchange) by dividing that with the Total Flows Gini Index (migration.gini.total): $$G^{T*}_{RC, CR} = 100\frac{G^T_{RC, CR}}{G^T}$$ As this index is standardized, it "facilitate comparisons from one period to the next" of the exchange indices.

Usage

migration.gini.exchange.standardized(m,
    gini.total = migration.gini.total(m, FALSE))

Arguments

m

migration matrix

gini.total

optionally pass the pre-computed Total Flows Gini Index to save resources

Value

A percentage range from 0% to 100% where 0% means that the migration flows are uniform, while a higher value indicates spatial focusing.

References

• David A. Plane and Gordon F. Mulligan (1997) Measuring Spatial Focusing in a Migration System. Demography 34, 251--262

See Also

migration.gini migration.gini.exchange

Examples

# NOT RUN {
data(migration.hyp)
migration.gini.exchange.standardized(migration.hyp)  # 25
migration.gini.exchange.standardized(migration.hyp2) # 22.22222
# }