ToothGrowth

From datasets v3.6.2 by R-core R-core@R-project.org

The Effect of Vitamin C on Tooth Growth in Guinea Pigs

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).

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).

References

McNeil, D. R. (1977). Interactive Data Analysis. New York: Wiley.

Crampton, E. W. (1947). The growth of the odontoblast of the incisor teeth as a criterion of vitamin C intake of the guinea pig. The Journal of Nutrition, 33(5), 491--504. 10.1093/jn/33.5.491.

Examples

library(datasets)

# NOT RUN {
require(graphics)
coplot(len ~ dose | supp, data = ToothGrowth, panel = panel.smooth,
       xlab = "ToothGrowth data: length vs dose, given type of supplement")
# }

Documentation reproduced from package datasets, version 3.6.2, License: Part of R 3.6.2

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