A data set from Oehlert (2000) \emph{A First Course in Design and
Analysis of Experiments}, New York: W. H. Freeman.

Data originally from Turgul Ergay (personal communication).

Columns are groups of cages, treatment (control, type 22 2.5%, type 22
5%, type 22 7.5%, type 22 isocaloric, type 27 2.5%, type 27 5%, type 27
7.5%, type 27 isocaloric), and average weight gain (g/day).