ToothGrowth {datasets} | R Documentation

## 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

### 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.

### Source

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

### References

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

### 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 2.7.1 Index]