手法を比較

	Spatial Exposure Index	Theil Segregation Index
分野	Human Geography	Sociology
系統	Process / pipeline	Process / pipeline
提唱年	1954	1971
提唱者	Wendell Bell (P* indices); Douglas Massey & Nancy Denton (segregation dimensions)	Henri Theil & Anthony Finizza
種類	Segregation measure of the potential contact or isolation between population groups	Entropy-based multigroup segregation index
原典	Bell, W. (1954). A probability model for the measurement of ecological segregation. Social Forces, 32(4), 357–364.	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.
別名	Exposure Index, Isolation Index, P-star Index	Theil's H, information theory index, entropy segregation index, multigroup entropy index
関連	4	5
概要	The exposure and isolation indices, written P*, measure residential segregation as the degree of potential contact between population groups across the neighbourhoods of a region. Developed by Wendell Bell in 1954 and later codified by Massey and Denton in 1988 as the 'exposure' dimension of segregation, they answer a different question from evenness measures like the dissimilarity index: not how unevenly groups are distributed, but how much members of one group actually share neighbourhoods with members of another or only with their own. The interaction index gauges cross-group exposure while the isolation index gauges within-group concentration, each interpretable as a probability.	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.