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	Isolation Index	Index of Dissimilarity
分野	Sociology	Sociology
系統	Process / pipeline	Process / pipeline
提唱年	1954	1955
提唱者	Wendell Bell (formalization of P* indices)	Otis Dudley Duncan & Beverly Duncan
種類	Exposure-dimension segregation index	Index of evenness of two groups across units
原典	Bell, W. (1954). A probability model for the measurement of ecological segregation. Social Forces, 32(4), 357–364.	Duncan, O. D., & Duncan, B. (1955). A methodological analysis of segregation indexes. American Sociological Review, 20(2), 210–217.
別名	P* isolation index, interaction index, exposure index, Bell isolation index	dissimilarity index, Duncan index, D index, segregation index
関連	5	5
概要	The isolation index measures the exposure dimension of segregation: the extent to which members of a minority group are exposed only to one another rather than to members of other groups. It answers the question 'what is the own-group share of the typical neighbor (or classmate, or coworker) that a member of the focal group encounters?' Unlike evenness measures, it depends on the relative size of the group as well as its spatial distribution.	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.