chao.sorenson: Chao's Jaccard and Sorenson Estimators of Shared Species

Description Usage Arguments Details Value Author(s) References See Also Examples

Description

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

Usage

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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: 148-159.

See Also

bray.curtis

Examples

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##Species counts from two different locations
a <- c(1,0,4,3,5,0,0,7)
b <- c(2,1,3,0,0,1,0,6)
chao.sorenson(a,b)
chao.jaccard(a,b)


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