\Header{Earthquake}{Earthquake Intensity}
\keyword{datasets}{Earthquake}
\begin{Description}\relax
The \code{Earthquake} data frame has 182 rows and 5 columns.
\end{Description}
\begin{Format}\relax
This data frame contains the following columns:
\describe{
\item[Quake] an ordered factor with levels
\code{20} < \code{16} < \code{14} < \code{10} < \code{3} <
\code{8} < \code{23} < \code{22} < \code{6} < \code{13} <
\code{7} < \code{21} < \code{18} < \code{15} < \code{4} <
\code{12} < \code{19} < \code{5} < \code{9} < \code{1} <
\code{2} < \code{17} < \code{11} indicating the earthquake
on which the measurements were made.

\item[Richter] a numeric vector giving the intensity of the earthquake on
the Richter scale.

\item[distance] the distance from the seismological measuring station to the
epicenter of the earthquake (km).

\item[soil] a factor with levels \code{0} and \code{1} 
giving the soil condition at the measuring station, either
soil or rock. 

\item[accel] maximum horizontal acceleration observed (g).

}
\end{Format}
\begin{Details}\relax
Measurements recorded at available seismometer locations for 23
large earthquakes in western North America between 1940 and 1980.
They were originally given in Joyner and Boore (1981); are
mentioned in Brillinger (1987); and are analyzed in Davidian
and Giltinan (1995).
\end{Details}
\begin{Source}\relax
Pinheiro, J. C. and Bates, D. M. (2000), \emph{Mixed-Effects Models in S
and S-PLUS}, Springer, New York.  (Appendix A.8)

Davidian, M. and Giltinan, D. M. (1995), \emph{Nonlinear Models for
Repeated Measurement Data},  Chapman and Hall, London.

Joyner and Boor (1981), Peak horizontal acceleration and velocity from
strong-motion records including records from the 1979 Imperial
Valley, California, earthquake, \emph{Bulletin of the Seismological
Society of America}, \bold{71}, 2011-2038.

Brillinger, D. (1987), Comment on a paper by C. R. Rao,
\emph{Statistical Science}, \bold{2}, 448-450.
\end{Source}
\begin{Examples}
\begin{ExampleCode}
data(Earthquake)
\end{ExampleCode}
\end{Examples}

