Kulczynski distance matrix
Computes Kulczynski distances between the columns of a 0-1-matrix.
kulczynski(regmat)
regmat |
0-1-matrix. Columns are species, rows are regions. |
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).
A symmetrical matrix of Kulczynski distances.
Shi, G. R. (1993) Multivariate data analysis in palaeoecology and palaeobiogeography - a review. Palaeogeography, Palaeoclimatology, Palaeoecology 105, 199-234.
options(digits=4) data(kykladspecreg) kulczynski(t(kykladspecreg))
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