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% File src/library/datasets/man/ToothGrowth.Rd
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% Part of the R package, https://www.R-project.org
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% Copyright 1995-2018 R Core Team
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% Distributed under GPL 2 or later
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\name{ToothGrowth}
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\docType{data}
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\alias{ToothGrowth}
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\title{The Effect of Vitamin C on Tooth Growth in Guinea Pigs}
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\description{
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  The response is the length of odontoblasts (cells responsible for
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  tooth growth) in 60 guinea pigs.  Each animal received one of three
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  dose levels of vitamin C (0.5, 1, and 2 mg/day) by one of two delivery
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  methods, orange juice or ascorbic acid (a form of vitamin C and coded
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  as \code{VC}).
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}
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\usage{ToothGrowth}
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\format{
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  A data frame with 60 observations on 3 variables.
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  \tabular{rlll}{
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    [,1]  \tab len   \tab numeric  \tab Tooth length\cr
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    [,2]  \tab supp  \tab factor   \tab Supplement type (VC or OJ).\cr
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    [,3]  \tab dose  \tab numeric  \tab Dose in milligrams/day
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  }
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}
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\source{
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  C. I. Bliss (1952).
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  \emph{The Statistics of Bioassay}.
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  Academic Press.
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}
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\references{
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  McNeil, D. R. (1977).
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  \emph{Interactive Data Analysis}.
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  New York: Wiley.
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  Crampton, E. W. (1947).
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  The growth of the odontoblast of the incisor teeth as a criterion of
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  vitamin C intake of the guinea pig.
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  \emph{The Journal of Nutrition}, \bold{33}(5), 491--504.
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  \doi{10.1093/jn/33.5.491}.
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}
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\examples{
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require(graphics)
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coplot(len ~ dose | supp, data = ToothGrowth, panel = panel.smooth,
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       xlab = "ToothGrowth data: length vs dose, given type of supplement")
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}
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\keyword{datasets}