\Header{trees}{Girth, Height and Volume for Black Cherry Trees}
\keyword{datasets}{trees}
\begin{Usage}
\begin{verbatim}data(trees)\end{verbatim}
\end{Usage}
\begin{Description}
This data set provides measurements of the girth, height and volume
of timber in 31 felled black cherry trees.  Note that girth is the
diameter of the tree at 4 ft 6 in above the ground.\end{Description}
\begin{Source}
T. A. Ryan, B. L. Joiner and B. F. Ryan (1976).
The Minitab Student Handbook. Duxbury Press.\end{Source}
\begin{References}
A. C. Atkinson (1985).  Plots, Transformations and Regression.
Oxford University Press.\end{References}

