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. Demography34, 251--262
# NOT RUN {data(migration.hyp)
migration.gini.exchange.standardized(migration.hyp) # 25migration.gini.exchange.standardized(migration.hyp2) # 22.22222# }