Data from an experiment to study weight gained by 10 rats fed on four different diets, defined by a combination of the amount of protein (low and high) and by the source of protein (beef and cereal).
weight_gain
A data frame with 40 rows and 3 columns.
Column 1, source
: source of protein, a factor with levels
Beef
and Cereal
.
Column 2, type
: amount of protein, a factor with levels
High
and Low
.
Column 3, weightgain
: weight gained, in grams.
D. J. Hand, A. D. Lunn, K. J. McConway, and E. Ostrowski (1994). A Handbook of Small Datasets, Chapman and Hall/CRC, London.