\HeaderA{ships}{Ships Damage Data}{ships}
\keyword{datasets}{ships}
\begin{Description}\relax
Data frame giving the number of damage incidents and aggregate
months of service by ship type,
year of construction, and period of operation.
\end{Description}
\begin{Usage}
\begin{verbatim}
ships
\end{verbatim}
\end{Usage}
\begin{Format}\relax
\describe{
\item[\code{type}] type: \code{"A"} to \code{"E"}

\item[\code{year}] year of construction: 1960-64, 65-69, 70-74, 75-79
(coded as \code{"60"}, \code{"65"}, \code{"70"}, \code{"75"})

\item[\code{period}] period of operation : 1960-74, 75-79

\item[\code{service}] aggregate months of service

\item[\code{incidents}] number of damage incidents
}
\end{Format}
\begin{Source}\relax
P. McCullagh and J. A. Nelder, (1983),
\emph{Generalized Linear Models.}
Chapman \& Hall, section 6.3.2, page 137
\end{Source}