prabclus (version 2.2-7)

kulczynski: Kulczynski distance matrix

Description

Computes Kulczynski distances between the columns of a 0-1-matrix.

Usage

kulczynski(regmat)

Arguments

regmat

0-1-matrix. Columns are species, rows are regions.

Value

A symmetrical matrix of Kulczynski distances.

Details

The Kulczynski distance between two species is 1-(mean of (number of regions where both species are present)/(number of regions where species 1 is present) and (number of regions where both species are present)/(number of regions where species 2 is present)). The similarity version of this is S28 in Shi (1993).

References

Shi, G. R. (1993) Multivariate data analysis in palaeoecology and palaeobiogeography - a review. Palaeogeography, Palaeoclimatology, Palaeoecology 105, 199-234.

See Also

jaccard, geco,qkulczynski , dicedist

Examples

# NOT RUN {
options(digits=4)
data(kykladspecreg)
kulczynski(t(kykladspecreg))
# }