Shoe wear data of Box, Hunter and Hunter
A list of two vectors, giving the wear of shoes of materials A and B for one foot each of ten boys.
G. E. P. Box, W. G. Hunter and J. S. Hunter (1978) Statistics for Experimenters. Wiley, p. 100
Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth edition. Springer.