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I have been reading a paper whereby the authors took values from Sorensons dissimilarity index and values from a percentage similarity index and applies G-Testing to the table of values. This is carried out to assess the differences in spider faunas (Strattton and Uetz, 1979). I like the method but have been trying to work out what function in R to use to get the percentage similarity. I have vegan installed and have been using it. I think R is brilliant. But using the formula... PS=3D2w/(a+b) where w=3Dminimum sum of individuals of species held in c...