Heights of Boys in Oxford
Oxboys data frame has 234 rows and 4 columns.
These data are described in Goldstein (1987) as data on the height of a selection of boys from Oxford, England versus a standardized age.
Pinheiro, J. C. and Bates, D. M. (2000), Mixed-Effects Models in S and S-PLUS, Springer, New York. (Appendix A.19)