Description Usage Arguments Value References See Also Examples

The Columns Gini index concentrates on the "relative extent to which the destination selections of in-migrations are spatially focused":

*G^T_R =
\frac{∑_j ∑_{i \neq j} ∑_{g \neq i,j} | M_{ij} -
M_{gj} | }{ (2n(n-1)-1) ∑_i ∑_{j \neq i} M_{ij}}*

This implementation solves the above formula by computing
the `dist`

matrix for each columns.

1 |

`m` |
migration matrix |

A number between 0 and 1 where 0 means no spatial focusing and 1 shows maximum focusing.

David A. Plane and Gordon F. Mulligan (1997) Measuring Spatial Focusing in a Migration System.

*Demography***34**, 251–262

`migration.gini.row`

`migration.gini.col.standardized`

1 2 3 | ```
data(migration.hyp)
migration.gini.col(migration.hyp) # 0.05555556
migration.gini.col(migration.hyp2) # 0.04166667
``` |

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