Estimates the variation matrix with robust methods.
data frame or matrix with positive entries
if FALSE, standard measures are used.
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.
The (robust) variation matrix.
Aitchison, J. (1986) The Statistical Analysis of Compositional Data Monographs on Statistics and Applied Probability. Chapman \& Hall Ltd., London (UK). 416p.
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