format
A list providing a summary of the data. The list contains:
lcl{
moth$means : the mean vector,
moth$stddev : the vector of standard deviations,
moth$corr : the correlation matrix, and
moth$n : the sample size.
}source
Whittaker, J. (1990) Graphical models in applied
multivariate statistics. Chichester: Wiley. (See Ch. 10.3).