pub fn tooth_growth() -> Result<DataFrame, PolarsError>Expand description
§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] lennumeric Tooth length
- [,2] supp factorSupplement type (VC or OJ).
- [,3] dose numeric Dose in milligrams/day
§Source:
C. I. Bliss (1952). The Statistics of Bioassay. Academic Press.
§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. doi:10.1093/jn/33.5.491 https://doi.org/10.1093/jn/33.5.491.
§Examples:
require(graphics)
coplot(len ~ dose | supp, data = ToothGrowth, panel = panel.smooth,
xlab = "ToothGrowth data: length vs dose, given type of supplement")