Measures of Multigroup Segregation
Authors: Reardon S.F.1, *; Firebaugh G.1
Source: Sociological Methodology, Volume 32, Number 1, 1 January 2002 , pp. 33-67(35)
Publisher: Blackwell Publishing
Abstract:
In this paper we derive and evaluate measures of multigroup segregation. After describing four ways to conceptualize the measurement of multigroup segregationas the disproportionality in group (e.g., race) proportions across organizational units (e.g., schools or census tracts), as the strength of association between nominal variables indexing group and organizational unit membership, as the ratio of betweenunit diversity to total diversity, and as the weighted average of twogroup segregation indiceswe derive six multigroup segregation indices: a dissimilarity index (D), a Gini index (G), an information theory index (H), a squared coefficient of variation index (C), a relative diversity index (R), and a normalized exposure index (P). We evaluate these six indices against a set of seven desirable properties of segregation indices. We conclude that the information theory index H is the most conceptually and mathematically satisfactory index, since it alone obeys the principle of transfers in the multigroup case. Moreover, H is the only multigroup index that can be decomposed into a sum of between and withingroup components.

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