format
A list providing a summary of the data. The list contains:
lcl{
mathmarks$means
: the mean vector,
mathmarks$stddev
: the vector of standard deviations,
mathmarks$corr
: the correlation matrix, and
mathmarks$n
: the sample size.
}source
Mardia, K.V., Kent, J.T. & Bibby, J.M. (1979) Multivariate
analysis. London: Academic Press. (See pp.3-4).
Whittaker, J. (1990) Graphical models in applied
multivariate statistics. Chichester: Wiley. (See Ch. 1.1).