方法对比

	Index of Dissimilarity	Lorenz Curve
领域	Sociology	Sociology
方法族	Process / pipeline	Process / pipeline
起源年份	1955	1905
提出者	Otis Dudley Duncan & Beverly Duncan	Max Otto Lorenz
类型	Index of evenness of two groups across units	Graphical representation of distributional inequality
开创性文献	Duncan, O. D., & Duncan, B. (1955). A methodological analysis of segregation indexes. American Sociological Review, 20(2), 210–217.	Lorenz, M. O. (1905). Methods of measuring the concentration of wealth. Publications of the American Statistical Association, 9(70), 209–219.
别名	dissimilarity index, Duncan index, D index, segregation index	Lorenz concentration curve, Lorenz diagram, cumulative share curve
相关	5	5
摘要	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 Lorenz curve is a graphical device that displays the full shape of inequality in a distribution by plotting the cumulative share of a quantity (such as income) held by the cumulative share of the population, ranked from poorest to richest. Introduced by Max Lorenz in 1905, it underlies the Gini coefficient and provides the basis for ranking distributions by inequality when one curve lies entirely above another.