prabclus (version 2.3-4)

qkulczynski: Quantitative Kulczynski distance matrix

Description

Computes quantitative Kulczynski distances between the columns of an abundance matrix.

Usage

qkulczynski(regmat, log.distance=FALSE)

Value

A symmetrical matrix of quantitative Kulczynski distances.

Arguments

regmat

(non-negative) abundance matrix. Columns are species, rows are regions.

log.distance

logical. If TRUE, 1 is added to the abundance matrix and then the logs of the values are taken in order to compute the distance.

Author

Christian Hennig https://www.unibo.it/sitoweb/christian.hennig/en

Details

The quantitative Kulczynski distance between two species is 1-(mean of (mean of over regions minimum abundance of both species)/(sum of abundances of species 1) and (mean of over regions minimum abundance of both species)/(sum of abundances of species 2)). If the abundance matrix is a 0-1-matrix, this gives the standard Kulczynski distance.

References

D. P. Faith, P. R. Minchin and L. Belbin (1987) Compositional dissimilarity as a robust measure of ecological distance. Vegetation 69, 57-68.

See Also

kulczynski

Examples

options(digits=4)
data(kykladspecreg)
qkulczynski(t(kykladspecreg))