Body Temperature Series of Beaver 1

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

SUMMARY

The beaver1 data frame has 114 rows and 4 columns on body temperature measurements at 10 minute intervals.

DATA DESCRIPTION

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.

This data frame contains the following columns:

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

beaver2

Examples

### Not usable in R
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.mle(temp, xreg=X, model=list(ar=0.82))

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