\Header{SP500}{Returns of the Standard and Poors 500}
\keyword{datasets}{SP500}
\begin{Description}\relax
Returns of the Standard and Poors 500 Index in the 1990's
\end{Description}
\begin{Usage}
\begin{verbatim}
data(SP500)
\end{verbatim}
\end{Usage}
\begin{Format}\relax
A vector of returns of the Standard and Poors 500 index for all
the trading days in 1990, 1991, \dots, 1999.
\end{Format}
\begin{References}\relax
Venables, W. N. and Ripley, B. D. (2002)
\emph{Modern Applied Statistics with S.} Fourth edition.  Springer.
\end{References}

