The spatial version of the Gini index can be derived from the Lorenz curve as the area between the segregation curve and the diagonal.
- an object of class matrix (or which can be coerced to that class), where each column represents the distribution of a group within spatial units. The number of columns should be greater than 1 (at least 2 groups are required). You should not include a column with total population, because this will be interpreted as a group.
a numeric vector containing the Gini's segregation index value for each group
Duncan O. D. and Duncan B. (1955) A Methodological Analysis of Segregation Indexes. American Sociological Review 41, pp. 210-217
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