Chao's Jaccard and Sorenson shared species estimators for use with incomplete datasets
species from group A
species from group B
You must provide two separate vectors, with species arranged in the same order, from area A and B. If species are present in one site but not the other, these must be recorded for both sites; the site where they are not found should be coded as a zero. Species not present at either site are ignored.
Returns the Chao-Jaccard or Chao-Sorenson similarity index for the two sites in question.
Chao, A., R. L. Chazdon, et al. 2005. A new statistical approach for assessing similarity of species composition with incidence and abundance data. Ecology Letters 8: 148-159.
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