distratio {prabclus}R Documentation

Distance ratio test statistics for distance based clustering

Description

Calculates the ratio between the prop smallest and largest distances of a distance matrix.

Usage

distratio(distmat, prop = 0.25)

Arguments

distmat symmetric distance matrix.
prop numerical. Proportion between 0 and 1.

Details

Rounding is by floor for small and ceiling for large distances.

Value

A list with components

dr ratio of prop smallest to prop largest distances.
lowmean mean of prop smallest distances.
himean mean of prop smallest distances.
prop see above.

Author(s)

Christian Hennig chrish@stats.ucl.ac.uk http://www.homepages.ucl.ac.uk/~ucakche

References

Hennig, C. and Hausdorf, B. (2004) Distance-based parametric bootstrap tests for clustering of species ranges. Computational Statistics and Data Analysis 45, 875-896.

See Also

prabtest

Examples

data(kykladspecreg)
j <- jaccard(t(kykladspecreg))
distratio(j)

[Package prabclus version 2.1-2 Index]