largest.kappas {ToolsForCoDa}

Calculate condition indices for subcompositions

Description

Function largest.kappas calculates the condition numbers for all subcompositions of a given size, for a particular compositional data set.

Usage

largest.kappas(Xcom, nparts = 3, sizetoplist = 10)

Arguments

Xcom

A data matrix with compositions in rows

nparts

The number of parts for the subcompositions to be analysed.

sizetoplist

The length of the list of the "best" subcompositions

Details

Log-ratio PCA is executed for each subcompostion, and the resulting eigenvalues and eigenvectors are stored.

Value

A data frame with an ordered list of subcompositions

Author(s)

Jan Graffelman ([e-mail])

Examples

X <- matrix(runif(600),ncol=6)
Xcom <- X/rowSums(X)
Results <- largest.kappas(Xcom)