edge (version 2.4.2)

gini: Gini dispersion index

Description

Gini index for each column of a matrix.

Usage

gini(x)

Arguments

x

non-negative numeric matrix

Value

• Numeric vector of length ncol(x).

Details

The Gini coefficient or index is a measure of inequality or diversity. It is zero if all the values of x are equal. It reaches a maximum value of 1/nrow(x) when all values are zero except for one. The Gini index is only interpretable for non-negative quantities. It is not meaningful if x contains negative values.

References

https://en.wikipedia.org/wiki/Gini_coefficient.

Examples

x <- matrix(rpois(20,lambda=5),10,2)
gini(x)