Body Temperature Series of Beaver 1

SUMMARY:

Reynolds (1994) describes a small part of a study of the long-term temperature dynamics of beaver 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.

DATA DESCRIPTION:

The beav1 data frame has 114 rows and 4 columns. This data frame contains the following columns:

ARGUMENTS:

day
Day of observation (in days since the beginning of 1990), December 12-13.
time
Time of observation, in the form 0330 for 3.30am
temp
Measured body temperature in degrees Celcius
activ
Indicator of activity outside the retreat

NOTE:

The observation at 22:20 is missing.

SOURCE:

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) Case Studies in Biometry. New York: John Wiley and Sons.

SEE ALSO:

EXAMPLES:

beav1 <- beav1 # make local copy
attach(beav1)
beav1$hours <- 24*(day-346) + trunc(time/100) + (time%%100)/60
detach()
plot(beav1$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 <- rts(c(temp[1:82], NA, temp[83:114]), start = 9.5,
            frequency = 6, units = "hours")
activ <- rts(c(activ[1:82], NA, activ[83:114]), start = 9.5,
             frequency = 6, units = "hours")
acf(temp[1:53]) # and also 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])
arima.(temp, c(1,0,0), xreg = X)