affinity index

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A measure of the relative similarity in composition of two samples. For example, A=c/√(a+b), where A is the affinity index, a and b are the numbers of species in one sample but not in the other and vice versa respectively, and c is the number of species common to both. The reciprocal, √(a+b)/c, indicates the ecological distance (D) between samples.

Subjects: Ecology and Conservation — Zoology and Animal Sciences.

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