migration.gini.col.standardized: Standardized Columns Gini Index
Description
The standardized version of the Columns Gini Index (migration.gini.col) by dividing that with the Total Flows Gini Index (migration.gini.total):
$$G^{T*}_C = 100\frac{G^T_C}{G^T}$$
As this index is standardized, it "facilitate comparisons from one period to the next" of the columns indices.