Balanced incomplete block design on the effect of amino acids on growth of chick bones.
data(chicks)A data frame with 30 observations on the following 3 variables.
Treatment with levels All (all amino acids present),
Arg-(all acids present except Arg), etc.
bones were taken in pairs from 15 chicks
Log10 dry weight of bones at end of experiment
Bones from 7-day-old chick embryos were cultivated over a nutrient chemical medium. Two bones were available from each chick, and the experiment was set out in a balanced incomplete block design with two units per block. The treatments were growth in the complete medium, with about 30 nutrients in carefully controlled quantities, and growth in five other media, each with a single amino acid omitted. Thus His-, Arg-, and so forth denote media without particular amino acids.
Davison, A. C. (2003) Statistical Models. Cambridge University Press. Page 432.