Build 4.0.0.70 of xlsgen makes it possible to compute the Gini() coefficient of a vector of values. The Gini() coefficient (
Wikipedia) measures the dispersion of values, as a ratio between 0 and 1. For instance, if all values are the same, the Gini() coefficient is 0. The is a measure used in a number of markets.
The Gini() function is not an Excel function, which means it isn't part of any existing Excel version. It is an addition that only computes the value in the context of xlsgen.