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Cody Measure

Source: R/AllGenerics.R, R/diversity_beta.R
index_cody.Rd

Cody Measure

Usage

index_cody(x, ...)

# S4 method for class 'matrix'
index_cody(x)

Arguments

x

A \(m \times p\) numeric matrix of count data (absolute frequencies, i.e. a contingency table).

...

Currently not used.

Value

A numeric vector.

Details

This assumes that the order of the matrix rows (from \(1\) to \(n\)) follows the progression along the gradient/transect.

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

References

Cody, M. L. (1975). Towards a theory of continental species diversity: Bird distributions over Mediterranean habitat gradients. In M. L. Cody & J. M. Diamond (Eds.), Ecology and Evolution of Communities. Cambridge, MA: Harvard University Press, p. 214-257.

See also

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

Author

N. Frerebeau