migration.gini.row {migration.indices} | R Documentation |
Rows Gini Index
Description
The Rows Gini index concentrates on the "relative extent to which the destination selections of out-migrations are spatially focused":
G^T_R = \frac{\sum_i \sum_{j \neq i} \sum_{h \neq i,j} | M_{ij} - M_{ih} | }{ (2n(n-1)-1) \sum_i \sum_{j \neq i} M_{ij}}
This implementation solves the above formula by computing the dist
matrix for each row.
Usage
migration.gini.row(m)
Arguments
m |
migration matrix |
Value
A number between 0 and 1 where 0 means no spatial focusing and 1 shows maximum 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.col
migration.gini.row.standardized
Examples
data(migration.hyp)
migration.gini.row(migration.hyp) # 0
migration.gini.row(migration.hyp2) # 0.02083333
[Package migration.indices version 0.3.1 Index]