The Gini Methodology A Primer on a Statistical Methodology / by Shlomo Yitzhaki, Edna Schechtman.
Gini's mean difference (GMD) was first introduced by Corrado Gini in 1912 as an alternative measure of variability. GMD and the parameters which are derived from it (such as the Gini coefficient or the concentration ratio) have been in use in the area of income distribution for almost a century...
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