Data taken from Example 6.1.7, Table 6.2 Rootstock Data, pp.170-173, of
Rencher A.C. (2002), Methods of Multivariate Analysis, 2nd Edition,
New York: Wiley. Data originally from pp.357-360 of
Andrews D.F., & Herzberg, A.M. (1985), Data, New York: Springer-Verlag.