手法を比較

	Atkinson Index	Index of Dissimilarity
分野	Sociology	Sociology
系統	Process / pipeline	Process / pipeline
提唱年	1970	1955
提唱者	Anthony Barnes Atkinson	Otis Dudley Duncan & Beverly Duncan
種類	Welfare-based, parameterized inequality index	Index of evenness of two groups across units
原典	Atkinson, A. B. (1970). On the measurement of inequality. Journal of Economic Theory, 2(3), 244–263.	Duncan, O. D., & Duncan, B. (1955). A methodological analysis of segregation indexes. American Sociological Review, 20(2), 210–217.
別名	Atkinson inequality measure, Atkinson's A, welfare-based inequality index	dissimilarity index, Duncan index, D index, segregation index
関連	5	5
概要	The Atkinson index is a welfare-based measure of inequality that incorporates an explicit, analyst-chosen parameter for how much society dislikes inequality. Introduced by Anthony Atkinson in 1970, it asks what fraction of total income could be discarded, under an equal distribution, while leaving social welfare unchanged — making the ethical judgement behind any inequality comparison transparent rather than hidden.	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.