ToothGrowth
The Effect of Vitamin C on Tooth Growth in Guinea Pigs
The response is the length of odontoblasts (teeth) in each of 10 guinea pigs at each of three dose levels of Vitamin C (0.5, 1, and 2 mg) with each of two delivery methods (orange juice or ascorbic acid).
- Keywords
- datasets
Usage
ToothGrowth
Format
A data frame with 60 observations on 3 variables.
[,1] | len | numeric |
Tooth length | [,2] | supp |
factor | Supplement type (VC or OJ). | [,1] |
Source
C. I. Bliss (1952) The Statistics of Bioassay. Academic Press.
References
McNeil, D. R. (1977) Interactive Data Analysis. New York: Wiley.
Examples
library(datasets)
require(graphics)
coplot(len ~ dose | supp, data = ToothGrowth, panel = panel.smooth,
xlab = "ToothGrowth data: length vs dose, given type of supplement")
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