chao.sorenson {fossil} | R Documentation |
Chao's Jaccard and Sorenson shared species estimators for use with incomplete datasets
chao.sorenson(x, y) chao.jaccard(x, y)
x |
species from group A |
y |
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.
Matthew Vavrek
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(2): 148-159.
##add examples