\HeaderA{beav1}{Body Temperature Series of Beaver 1}{beav1}
\keyword{datasets}{beav1}
\begin{Description}\relax
Reynolds (1994) describes a small part of a study of the long-term
temperature dynamics of beaver \emph{Castor canadensis} in
north-central Wisconsin.  Body temperature was measured by telemetry
every 10 minutes for four females, but data from a one period of less
than a day for each of two animals is used there.
\end{Description}
\begin{Usage}
\begin{verbatim}
beav1
\end{verbatim}
\end{Usage}
\begin{Format}\relax
The \code{beav1} data frame has 114 rows and 4 columns.
This data frame contains the following columns:
\describe{
\item[\code{day}] Day of observation (in days since the beginning of 1990),
December 12--13.

\item[\code{time}] Time of observation, in the form \code{0330} for 3.30am.

\item[\code{temp}] Measured body temperature in degrees Celsius.

\item[\code{activ}] Indicator of activity outside the retreat.

}
\end{Format}
\begin{Note}\relax
The observation at 22:20 is missing.
\end{Note}
\begin{Source}\relax
P. S. Reynolds (1994) Time-series analyses of beaver body temperatures.
Chapter 11 of
Lange, N., Ryan, L., Billard, L., Brillinger, D., Conquest, L.
and Greenhouse, J. eds (1994) \emph{Case Studies in Biometry.} New
York: John Wiley and Sons.
\end{Source}
\begin{References}\relax
Venables, W. N. and Ripley, B. D. (2002)
\emph{Modern Applied Statistics with S.} Fourth edition.  Springer.
\end{References}
\begin{SeeAlso}\relax
\code{\LinkA{beav2}{beav2}}
\end{SeeAlso}
\begin{Examples}
\begin{ExampleCode}
attach(beav1)
beav1$hours <- 24*(day-346) + trunc(time/100) + (time%%100)/60
plot(beav1$hours, beav1$temp, type="l", xlab="time",
   ylab="temperature", main="Beaver 1")
usr <- par("usr"); usr[3:4] <- c(-0.2, 8); par(usr=usr)
lines(beav1$hours, beav1$activ, type="s", lty=2)
temp <- ts(c(beav1$temp[1:82], NA, beav1$temp[83:114]),
           start = 9.5, frequency = 6)
activ <- ts(c(beav1$activ[1:82], NA, beav1$activ[83:114]),
            start = 9.5, frequency = 6)

acf(temp[1:53])
acf(temp[1:53], type = "partial")
ar(temp[1:53])
act <- c(rep(0, 10), activ)
X <- cbind(1, act = act[11:125], act1 = act[10:124],
          act2 = act[9:123], act3 = act[8:122])
alpha <- 0.80
stemp <- as.vector(temp - alpha*lag(temp, -1))
sX <- X[-1, ] - alpha * X[-115,]
beav1.ls <- lm(stemp ~ -1 + sX, na.action = na.omit)
summary(beav1.ls, cor = FALSE)
detach("beav1"); rm(temp, activ)
\end{ExampleCode}
\end{Examples}

