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\title{ Robust variation matrix }
  Estimates the variation matrix with robust methods.
robVariation(x, robust=TRUE)
  \item{x}{ data frame or matrix with positive entries }
  \item{robust}{ 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 
  \code{\link[stats]{mad}} is used when parameter robust is set to TRUE.
 The (robust) variation matrix.
\references{ Aitchison, J. (1986) \emph{The Statistical Analysis of Compositional
Data} Monographs on Statistics and Applied Probability. Chapman \&
Hall Ltd., London (UK). 416p. }
\author{ Matthias Templ }
\seealso{ \code{\link[compositions]{variation}} }
robVariation(expenditures, robust=FALSE)
\keyword{ multivariate }
\keyword{ robust }
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