Data obtained from Table 11.5, page 269 of{break}         Everitt, B. S., and G. Dunn. 2001.         Applied Multivariate Data Analysis. 2nd ed. London: Arnold.
Everitt and Dunn obtained the data from{break}         Manly, B. F. J. 1986.         Multivariate Statistical Methods: A Primer. London: Chapman and Hall.