\Header{attenu}{The Joyner-Boore Attenuation Data}
\keyword{datasets}{attenu}
\begin{Description}\relax
This data gives peak accelerations measured at various observation
stations for 23 earthquakes in California.  The data have been used
by various workers to estimate the attenuating affect of distance
on ground acceleration.\end{Description}
\begin{Usage}
\begin{verbatim}data(attenu)\end{verbatim}
\end{Usage}
\begin{Format}\relax
A dataframe with 182 observations on 5 variables.
\Tabular{rlll}{
[,1] & event    & numeric  & Event Number\\{}
[,2] & mag      & numeric  & Moment Magnitude\\{}
[,3] & station  & factor   & Station Number\\{}
[,4] & dist     & numeric  & Station-hypocenter distance (km)\\{}
[,5] & accel    & numeric  & Peak acceleration (g)}\end{Format}
\begin{Source}\relax
Joyner, W.B., D.M. Boore and R.D. Porcella (1981).  Peak horizontal
acceleration and velocity from strong-motion records including
records from the 1979 Imperial Valley, California earthquake.  USGS
Open File report 81-365. Menlo Park, Ca.\end{Source}
\begin{References}\relax
Boore, D. M. and Joyner, W.B.(1982)  The empirical prediction of
ground motion, \emph{Bull. Seism. Soc. Am.}, \bold{72}, S269--S268.

Bolt, B. A. and Abrahamson, N. A. (1982)  New attenuation relations for
peak and expected accelerations of strong ground motion, \emph{Bull.
Seism. Soc. Am.}, \bold{72}, 2307--2321.

Bolt B. A. and Abrahamson, N. A. (1983)  Reply to W. B. Joyner \&
D. M. Boore's ``Comments on: New attenuation relations for peak and
expected accelerations for peak and expected accelerations of strong
ground motion'', \emph{Bull. Seism. Soc. Am.}, \bold{73}, 1481--1483. 

Brillinger, D. R. and Preisler, H. K. (1984)  An exploratory analysis of
the Joyner-Boore attenuation data, \emph{Bull. Seism. Soc. Am.}
\bold{74}, 1441--1449.

Brillinger, D. R. and Preisler, H. K. (1984) \emph{Further analysis of
the Joyner-Boore attenuation data}.  Manuscript.\end{References}
\begin{Examples}
\begin{ExampleCode}
data(attenu)
## check the data class of the variables
sapply(attenu, data.class)
summary(attenu)
pairs(attenu, main = "attenu data")
coplot(accel ~ dist | as.factor(event), data = attenu, show = FALSE)
coplot(log(accel) ~ log(dist) | as.factor(event),
       data = attenu, panel = panel.smooth, show.given = FALSE)
\end{ExampleCode}
\end{Examples}

