\HeaderA{motor}{Data from a Simulated Motorcycle Accident}{motor}
\keyword{datasets}{motor}
\begin{Description}\relax
The \code{motor} data frame has 94 rows and 4 columns.  The rows are
obtained by removing replicate values of \code{time} from the dataset 
\code{\LinkA{mcycle}{mcycle}}.  Two extra columns are added to allow for strata with
a different residual variance in each stratum.
\end{Description}
\begin{Usage}
\begin{verbatim}
motor
\end{verbatim}
\end{Usage}
\begin{Format}\relax
This data frame contains the following columns:
\describe{
\item[\code{times}] The time in milliseconds since impact.

\item[\code{accel}] The recorded head acceleration (in g).

\item[\code{strata}] A numeric column indicating to which of the three strata (numbered 1, 2 and 3)
the observations belong.

\item[\code{v}] An estimate of the residual variance for the observation.  \code{v} is constant
within the strata but a different
estimate is used for each of the three strata.
}
\end{Format}
\begin{Source}\relax
The data were obtained from


Silverman, B.W. (1985) Some aspects of the spline smoothing approach to
non-parametric curve fitting. 
\emph{Journal of the Royal Statistical Society, B}, \bold{47}, 1--52.
\end{Source}
\begin{References}\relax
Davison, A.C. and Hinkley, D.V. (1997) 
\emph{Bootstrap Methods and Their Application}. Cambridge University Press.


Venables, W.N. and Ripley, B.D. (1994) 
\emph{Modern Applied Statistics with S-Plus}. Springer-Verlag.
\end{References}
\begin{SeeAlso}\relax
\code{\LinkA{mcycle}{mcycle}}
\end{SeeAlso}