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

Data originally from Peggy Swearingen (personal communication).

Columns are days (1, 28, 56, 84) of ripening, individual cheese,
r21 (no or yes), r50 (no or yes), and total free amino acids.