ToothGrowth: The Effect of Vitamin C on Tooth Growth in Guinea Pigs
Description
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).
Usage
ToothGrowth
Arguments
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.
require(graphics)
coplot(len ~ dose | supp, data = ToothGrowth, panel = panel.smooth,
xlab = "ToothGrowth data: length vs dose, given type of supplement")