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Dice-Sorensen Qualitative Index

Source: R/AllGenerics.R, R/similarity.R
index_sorensen.Rd

Dice-Sorensen Qualitative Index

Usage

index_sorensen(x, y, ...)

# S4 method for class 'logical,logical'
index_sorensen(x, y)

# S4 method for class 'numeric,numeric'
index_sorensen(x, y)

Arguments

x, y

A numeric vector.

...

Currently not used.

Value

A numeric vector.

Details

Data are standardized on a presence/absence scale (\(0\)/\(1\)) beforehand.

References

Dice, L. R. (1945). Measures of the Amount of Ecologic Association Between Species. Ecology, 26(3): 297-302. doi:10.2307/1932409

Sorensen, T. (1948). A Method of Establishing Groups of Equal Amplitude in Plant Sociology Based on Similarity of Species Content and Its Application to Analyses of the Vegetation on Danish Commons. Kongelige Danske Videnskabernes Selskab, 5(4): 1-34.

See also

Other beta diversity measures: index_binomial(), index_brainerd(), index_bray(), index_cody(), index_jaccard(), index_morisita(), index_routledge, index_whittaker(), index_wilson()

Author

N. Frerebeau