\Header{sunspots}{Monthly Mean Relative Sunspot Numbers}
\keyword{datasets}{sunspots}
\begin{Usage}
\begin{verbatim}data(sunspots)\end{verbatim}
\end{Usage}
\begin{Format}
A time series of 229 cases (years from 1749 to 1983) on 12
variables (the mean relative sunspot numbers in the months January
to December).  The last case is incomplete.\end{Format}
\begin{Description}
Zurich monthly sunspot numbers from 1749 to 1983.\end{Description}
\begin{Source}
D. F. Andrews and A. M. Herzberg (1985).
\emph{Data: A Collection of Problems from Many Fields for the
Student and Research Worker}.
New York: Springer-Verlag.\end{Source}

