Name Rascal/Libraries/analysis/statistics/Inference/gini

Synopsis Gini coefficient.

Function real gini(lrel[num observation,int frequency] values)

Usage import analysis::statistics::Inference;

Description Computes the Gini coefficient that measures the inequality among values in a frequency distribution.

The Gini coefficient is computed using Deaton's formula and returns a value between 0 (completely equal distribution) and 1 (completely unequal distribution).

Examples

rascal>import analysis::statistics::Inference;
ok

A completely equal distribution:

rascal>gini([<10000, 1>, <10000, 1>, <10000, 1>]);
real: 0.0

A rather unequal distribution:

rascal>gini([<998000, 1>, <20000, 3>, <117500, 1>, <70000, 2>, <23500, 5>, <45200,1>]);
real: 0.8530758129256304

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