R: The Effect of Vitamin C on Tooth Growth in Guinea Pigs
ToothGrowth
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
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 Nutrition33(5): 491–504.
http://jn.nutrition.org/content/33/5/491.full.pdf
Examples
require(graphics)
coplot(len ~ dose | supp, data = ToothGrowth, panel = panel.smooth,
xlab = "ToothGrowth data: length vs dose, given type of supplement")
Results
R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)
R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.
R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.
Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.
> library(datasets)
> png(filename="/home/ddbj/snapshot/RGM3/R_rel/result/datasets/ToothGrowth.Rd_%03d_medium.png", width=480, height=480)
> ### Name: ToothGrowth
> ### Title: The Effect of Vitamin C on Tooth Growth in Guinea Pigs
> ### Aliases: ToothGrowth
> ### Keywords: datasets
>
> ### ** Examples
>
> require(graphics)
> coplot(len ~ dose | supp, data = ToothGrowth, panel = panel.smooth,
+ xlab = "ToothGrowth data: length vs dose, given type of supplement")
>
>
>
>
>
> dev.off()
null device
1
>