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== incomplete ==
The main idea...

The similarity percentages breakdown (SIMPER) procedure (Clarke, 1993) attempts to assess the average percent contribution of individual variables to the dissimilarity between objects in a Bray-Curtis dissimilarity matrix. This allows users to identify variables that are likely to be the major contributors to any difference between groups detected by methods such as ANOSIM.
Warton et al (2012) raised several criticisms of the SIMPER approach