Similarity Indices in Community Studies: Potential Pitfalls

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Abstract
Four common similarity indices used in multivariate descriptive techniques, such as classifications and tellis diagrams, are compared over a range of overlap from 100-10% to a theoretical standard. Only the Bray-Curtis Index (also known as Czekanowski''s Quantitative Index, Proportional Similarity and a variety of other names) reflected accurately true similarity. The other indices (Canberra Metric, Morisita''s and Horn''s Information Theory) diverged, greatly from one another and from the theoretical standard.

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