# beav2

From MASS v7.3-51.4
by Brian Ripley

##### Body Temperature Series of Beaver 2

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.

- Keywords
- datasets

##### Usage

`beav2`

##### Format

The `beav2`

data frame has 100 rows and 4 columns.
This data frame contains the following columns:

`day`

Day of observation (in days since the beginning of 1990), November 3--4.

`time`

Time of observation, in the form

`0330`

for 3.30am.`temp`

Measured body temperature in degrees Celsius.

`activ`

Indicator of activity outside the retreat.

##### References

Venables, W. N. and Ripley, B. D. (2002)
*Modern Applied Statistics with S.* Fourth edition. Springer.

##### See Also

##### Examples

```
# NOT RUN {
attach(beav2)
beav2$hours <- 24*(day-307) + trunc(time/100) + (time%%100)/60
plot(beav2$hours, beav2$temp, type = "l", xlab = "time",
ylab = "temperature", main = "Beaver 2")
usr <- par("usr"); usr[3:4] <- c(-0.2, 8); par(usr = usr)
lines(beav2$hours, beav2$activ, type = "s", lty = 2)
temp <- ts(temp, start = 8+2/3, frequency = 6)
activ <- ts(activ, start = 8+2/3, frequency = 6)
acf(temp[activ == 0]); acf(temp[activ == 1]) # also look at PACFs
ar(temp[activ == 0]); ar(temp[activ == 1])
arima(temp, order = c(1,0,0), xreg = activ)
dreg <- cbind(sin = sin(2*pi*beav2$hours/24), cos = cos(2*pi*beav2$hours/24))
arima(temp, order = c(1,0,0), xreg = cbind(active=activ, dreg))
library(nlme) # for gls and corAR1
beav2.gls <- gls(temp ~ activ, data = beav2, corr = corAR1(0.8),
method = "ML")
summary(beav2.gls)
summary(update(beav2.gls, subset = 6:100))
detach("beav2"); rm(temp, activ)
# }
```

*Documentation reproduced from package MASS, version 7.3-51.4, License: GPL-2 | GPL-3*

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