PiscesLogoSmallerStill  Whittaker

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Whittaker's index of association is designed for species abundance data, as the abundance of each species in a sample is expressed as the fraction of the total number of individuals in the sample. The distance measure calculated by CAP is the complement of Whittaker's association index and is given by:

 

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where si1 and si2 are the abundances of species i in samples 1 and 2 respectively