\Header{ToothGrowth}{The Effect of Vitamin C on Tooth Growth in Guinea Pigs}
\keyword{datasets}{ToothGrowth}
\begin{Description}\relax
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).
\end{Description}
\begin{Usage}
\begin{verbatim}data(ToothGrowth)\end{verbatim}
\end{Usage}
\begin{Format}\relax
A data frame with 60 observations on 3 variables.
\Tabular{rlll}{
[,1]  & len   & numeric  & Tooth length\\{}
[,2]  & supp  & factor   & Supplement type (VC or OJ).\\{}
[,3]  & dose  & numeric  & Dose in milligrams.
}
\end{Format}
\begin{Source}\relax
C. I. Bliss (1952)
\emph{The Statistics of Bioassay}.
Academic Press.
\end{Source}
\begin{References}\relax
McNeil, D. R. (1977)
\emph{Interactive Data Analysis}.
New York: Wiley.
\end{References}
\begin{Examples}
\begin{ExampleCode}
data(ToothGrowth)
coplot(len ~ dose | supp, data = ToothGrowth, panel = panel.smooth,
       xlab = "ToothGrowth data: length vs dose, given type of supplement")
\end{ExampleCode}
\end{Examples}

