قارن الطرق

	Spatial Dissimilarity Index	Spatial Gini Concentration Index
المجال	Human Geography	Human Geography
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1993	1991
صاحب الطريقة	Richard Morrill & David Wong	Corrado Gini (coefficient); locational adaptation in regional science / economic geography
النوع	Boundary-aware index of residential segregation between two groups	Descriptive index of how unevenly an activity is distributed across space
المصدر التأسيسي	Wong, D. W. S. (1993). Spatial indices of segregation. Urban Studies, 30(3), 559–572.	Duncan, O. D., & Duncan, B. (1955). A methodological analysis of segregation indexes. American Sociological Review, 20(2), 210–217.
الأسماء البديلة	Spatial Index of Dissimilarity, Adjusted Dissimilarity Index, Boundary-Adjusted Dissimilarity, Spatial Segregation Index	Locational Gini Coefficient, Spatial Gini Index, Geographic Concentration Index, Gini Index of Spatial Inequality
ذات صلة	4	4
الملخص	The spatial dissimilarity index is a boundary-aware measure of residential segregation that corrects the classic index of dissimilarity for the fact that areal units are not isolated boxes but neighbours that share borders. Developed by Richard Morrill in 1991 and refined by David Wong in 1993, it discounts the aspatial index by the degree to which adjacent units differ in group composition, so that two groups clustered into separate but neighbouring areas are recorded as less segregated than two groups locked into a checkerboard. It directly addresses the long-standing checkerboard problem that the aspatial Duncan index cannot see.	The spatial (or locational) Gini concentration index adapts the classic Gini coefficient to geography, summarizing in a single number between zero and one how unevenly an activity — an industry, a population group, a resource — is distributed across spatial units relative to a benchmark such as total population or land area. It is the workhorse measure for quantifying geographic concentration and agglomeration in economic geography.