| chicks {SMPracticals} | R Documentation |
Chick Bone Data
Description
Balanced incomplete block design on the effect of amino acids on growth of chick bones.
Usage
data(chicks)Format
A data frame with 30 observations on the following 3 variables.
- Treat
Treatment with levels
All(all amino acids present),Arg-(all acids present except Arg), etc.- Pair
bones were taken in pairs from 15 chicks
- y
Log10 dry weight of bones at end of experiment
Details
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.
Source
Cox, D. R. and Snell, E. J. (1981) Applied Statistics: Principles and Examples. London: Chapman and Hall/CRC Press. Page 95.
References
Davison, A. C. (2003) Statistical Models. Cambridge University Press. Page 432.