\Header{phones}{The World's Telephones}
\keyword{datasets}{phones}
\begin{Description}\relax
The number of telephones in various regions of the world (in
thousands).
\end{Description}
\begin{Usage}
\begin{verbatim}data(phones)\end{verbatim}
\end{Usage}
\begin{Format}\relax
A matrix with 7 rows and 8 columns.  The columns of the matrix give
the figures for a given region, and the rows the figures for a year.

The regions are: North America, Europe, Asia, South America, Oceania,
Africa, Central America.

The years are: 1951, 1956, 1957, 1958, 1959, 1960, 1961.
\end{Format}
\begin{Source}\relax
AT\&T (1961) \emph{The World's Telephones}.
\end{Source}
\begin{References}\relax
McNeil, D. R. (1977)
\emph{Interactive Data Analysis}.
New York: Wiley.
\end{References}
\begin{Examples}
\begin{ExampleCode}
data(phones)
matplot(rownames(phones), phones, type = "b", log = "y",
        xlab = "Year", ylab = "Number of telephones (1000's)")
legend(1951.5, 80000, colnames(phones), col = 1:6, lty = 1:5, pch = rep(21, 7))
title(main = "phones data: log scale for response")
\end{ExampleCode}
\end{Examples}

