手法を比較

	Index of Dissimilarity	Gini Coefficient
分野	Sociology	Sociology
系統	Process / pipeline	Process / pipeline
提唱年	1955	1912
提唱者	Otis Dudley Duncan & Beverly Duncan	Corrado Gini
種類	Index of evenness of two groups across units	Scalar measure of statistical dispersion / inequality
原典	Duncan, O. D., & Duncan, B. (1955). A methodological analysis of segregation indexes. American Sociological Review, 20(2), 210–217.	Ceriani, L., & Verme, P. (2012). The origins of the Gini index: extracts from Variabilità e Mutabilità (1912) by Corrado Gini. The Journal of Economic Inequality, 10(3), 421–443.
別名	dissimilarity index, Duncan index, D index, segregation index	Gini index, Gini ratio, Gini concentration ratio, G
関連	5	5
概要	The index of dissimilarity, often called the Duncan segregation index, measures how unevenly two groups — such as two racial or occupational groups — are distributed across a set of units like neighborhoods, schools, or occupations. It ranges from 0, when both groups have identical distributions across units, to 1, when the units are completely segregated, and has the intuitive interpretation of the share of one group that would have to relocate to achieve an even distribution.	The Gini coefficient is the most widely used single-number summary of inequality in a distribution such as income or wealth. Introduced by the Italian statistician Corrado Gini in 1912, it equals twice the area between the Lorenz curve and the line of perfect equality, ranging from 0 when everyone has the same amount to a maximum approaching 1 when one unit holds everything.