手法を比較

	Theil Segregation Index	Isolation Index
分野	Sociology	Sociology
系統	Process / pipeline	Process / pipeline
提唱年	1971	1954
提唱者	Henri Theil & Anthony Finizza	Wendell Bell (formalization of P* indices)
種類	Entropy-based multigroup segregation index	Exposure-dimension segregation index
原典	Theil, H., & Finizza, A. J. (1971). A note on the measurement of racial integration of schools by means of informational concepts. Journal of Mathematical Sociology, 1(2), 187–193.	Bell, W. (1954). A probability model for the measurement of ecological segregation. Social Forces, 32(4), 357–364.
別名	Theil's H, information theory index, entropy segregation index, multigroup entropy index	P* isolation index, interaction index, exposure index, Bell isolation index
関連	5	5
概要	Theil's information index, denoted H, is an entropy-based measure of segregation that, unlike the two-group dissimilarity index, handles any number of groups at once. It compares the diversity (entropy) found within each unit to the diversity of the whole population: segregation is high when units are internally homogeneous even though the overall population is diverse. Its defining virtue is exact decomposability across nested levels and across groups.	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.