Robust and classical variation matrix

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Description

Estimates the variation matrix with robust methods.

Usage

1
variation(x, robust = TRUE)

Arguments

x

data frame or matrix with positive entries

robust

if FALSE, standard measures are used.

Details

The variation matrix is estimated for a given compositional data set. Instead of using the classical standard deviations the mad is used when parameter robust is set to TRUE.

Value

The (robust) variation matrix.

Author(s)

Matthias Templ

References

Aitchison, J. (1986) The Statistical Analysis of Compositional Data Monographs on Statistics and Applied Probability. Chapman \& Hall Ltd., London (UK). 416p.

Examples

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