\HeaderA{presidents}{Quarterly Approval Ratings of US Presidents}{presidents}
\keyword{datasets}{presidents}
\begin{Description}\relax
The (approximately) quarterly approval rating for the President of the
United states from the first quarter of 1945 to the last quarter of
1974.
\end{Description}
\begin{Usage}
\begin{verbatim}presidents\end{verbatim}
\end{Usage}
\begin{Format}\relax
A time series of 120 values.
\end{Format}
\begin{Details}\relax
The data are actually a fudged version of the approval ratings.  See
McNeil's book for details.
\end{Details}
\begin{Source}\relax
The Gallup Organisation.
\end{Source}
\begin{References}\relax
McNeil, D. R. (1977)
\emph{Interactive Data Analysis}.
New York: Wiley.
\end{References}
\begin{Examples}
\begin{ExampleCode}
plot(presidents, las = 1, ylab = "Approval rating (%)",
     main = "presidents data")
\end{ExampleCode}
\end{Examples}