prabclus (version 2.2-2)

distratio: 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.

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.

Details

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

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)