Simpson's interaction index measures the probability that randomly selected individuals are not in the same group.
- 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.
Simpson's interaction index
Simpson E. H. (1949) Measurement of diversity. Nature 163:688
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