手法を比較

	Atkinson Index	Theil Segregation Index
分野	Sociology	Sociology
系統	Process / pipeline	Process / pipeline
提唱年	1970	1971
提唱者	Anthony Barnes Atkinson	Henri Theil & Anthony Finizza
種類	Welfare-based, parameterized inequality index	Entropy-based multigroup segregation index
原典	Atkinson, A. B. (1970). On the measurement of inequality. Journal of Economic Theory, 2(3), 244–263.	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	Atkinson inequality measure, Atkinson's A, welfare-based inequality index	Theil's H, information theory index, entropy segregation index, multigroup entropy 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.	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.