stable {vegsoup}R Documentation

Classification Stability

Description

Adjusted Goodman-Kruskal's lambda index of classification stability calculated from cross-tabulation of partitions (clusters) obtained from the data set and the subset selected by without-replacement bootstrap. Assignments are evaluated by Goodman-Kruskal’s lambda index.

Usage

## S4 method for signature 'VegsoupPartition'
stable(x, nitr = 200, nitr.lambda = 10, ...)

Arguments

x

VegsoupPartition object.

nitr

number of iterations.

nitr.lambda

number of iteration to calculate random values of lambda.

...

arguments passed to VegsoupPartition except argument method which is obtained from the object x.

Value

returns a list with components

lambda

lambda statistic, values range from 0 (no association) to 1 (the theoretical maximum possible association)

modified.lambda

modified lambda statistic

Note

This function is experimental!

Author(s)

original authors, Roland Kaiser

References

Tichý, L. and Chytrý, M. and Šmarda, P. (2011) Evaluating the stability of the classification of community data. Ecography 34:807-813

See Also

OptimStride, sample,

Examples

x <- VegsoupPartition(coenoflex(seed = 1234), k = 3)

stable(x, nitr = 19, nitr.lambda = 10)

[Package vegsoup version 0.2-7 Index]