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The Gini coefficient of inequality is a measure of how uneven or unequal a distribution is.  The ratio varies between no inequality (0) and complete inequality (1).  The '''Gini index''' is the Gini coefficient multiplied by 100, like a percentage.

The Gini coefficient of inequality is a measure of how uneven or unequal a distribution is.  The ratio varies between no inequality (0) and complete inequality (1).  The '''Gini index''' is the Gini coefficient multiplied by 100, like a percentage.

On a [[Lorenz diagram]], the Gini coefficient of inequality equals the area between the Lorenz curve and the diagonal line divided by the entire area that lies underneath the diagonal line.<ref.http://people.hofstra.edu/geotrans/eng/ch4en/meth4en/ch4m1en.html</ref>

On a [[Lorenz diagram]], the Gini coefficient of inequality equals the area between the Lorenz curve and the diagonal line divided by the entire area that lies underneath the diagonal line.<ref>http://people.hofstra.edu/geotrans/eng/ch4en/meth4en/ch4m1en.html</ref>

The Gini coefficient was developed by the Italian statistician [[Corrado Gini]] in his 1912 paper entitled (in Italian) ''Variability and Mutability''.   

The Gini coefficient was developed by the Italian statistician [[Corrado Gini]] in his 1912 paper entitled (in Italian) ''Variability and Mutability''.