R: The Effect of Vitamin C on Tooth Growth in Guinea Pigs

ToothGrowth {datasets}

R Documentation

The Effect of Vitamin C on Tooth Growth in Guinea Pigs

Description

The response is the length of odontoblasts (cells responsible for tooth growth) in 60 guinea pigs. Each animal received one of three dose levels of vitamin C (0.5, 1, and 2 mg/day) by one of two delivery methods, orange juice or ascorbic acid (a form of vitamin C and coded as VC).

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).
[,3]	`dose`	numeric	Dose in milligrams/day

Source

C. I. Bliss (1952). The Statistics of Bioassay. Academic Press.

References

⁠Crampton EW (1947). “The Growth of the Odontoblasts of the Incisor Tooth as a Criterion of the Vitamin C Intake of the Guinea Pig.” The Journal of Nutrition, 33(5), 491–504. doi:10.1093/jn/33.5.491.

⁠McNeil D (1977). Interactive Data Analysis: A Practical Primer. John Wiley & Sons. ISBN 978-0471026310.

Examples

require(graphics)
coplot(len ~ dose | supp, data = ToothGrowth, panel = panel.smooth,
       xlab = "ToothGrowth data: length vs dose, given type of supplement")

[Package datasets version 4.6.0 Index]