chao.sorenson {fossil}R Documentation

Chao's Jaccard and Sorenson Estimators of Shared Species

Description

Chao's Jaccard and Sorenson shared species estimators for use with incomplete datasets

Usage

chao.sorenson(x, y)
chao.jaccard(x, y)

Arguments

x species from group A
y species from group B

Details

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.

Value

Returns the Chao-Jaccard or Chao-Sorenson similarity index for the two sites in question.

Author(s)

Matthew Vavrek

References

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.

See Also

bray.curtis

Examples

##add examples

[Package fossil version 0.2.0 Index]