\include{zinput} \begin{document}\section{{\tt tobin}: Tobin's Tobit Data}\label{ss:tobin}
\keyword{datasets}{tobin}
\begin{Description}\relax
Economists fit a parametric censored data model called the
`tobit'. These data are from Tobin's original paper.
\end{Description}
\begin{Usage}
\begin{verbatim}data(tobin)\end{verbatim}
\end{Usage}
\begin{Format}\relax
A data frame with 20 observations on the following 3 variables.

durable: Durable goods purchase

age: Age in years

quant: Liquidity ratio (x 1000)
\end{Format}
\begin{Source}\relax
J. Tobin, Estimation of relationships for limited dependent
variables, Econometrica, v26, 24-36, 1958.
\end{Source}

\end{document}
