EVOLUTION-MANAGER
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>R: Body Temperature Series of Beaver 2</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link rel="stylesheet" type="text/css" href="R.css" /> </head><body> <table width="100%" summary="page for beav2 {MASS}"><tr><td>beav2 {MASS}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2> Body Temperature Series of Beaver 2 </h2> <h3>Description</h3> <p>Reynolds (1994) describes a small part of a study of the long-term temperature dynamics of beaver <em>Castor canadensis</em> 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. </p> <h3>Usage</h3> <pre> beav2 </pre> <h3>Format</h3> <p>The <code>beav2</code> data frame has 100 rows and 4 columns. This data frame contains the following columns: </p> <dl> <dt><code>day</code></dt><dd> <p>Day of observation (in days since the beginning of 1990), November 3–4. </p> </dd> <dt><code>time</code></dt><dd> <p>Time of observation, in the form <code>0330</code> for 3.30am. </p> </dd> <dt><code>temp</code></dt><dd> <p>Measured body temperature in degrees Celsius. </p> </dd> <dt><code>activ</code></dt><dd> <p>Indicator of activity outside the retreat. </p> </dd> </dl> <h3>Source</h3> <p>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) <em>Case Studies in Biometry.</em> New York: John Wiley and Sons. </p> <h3>References</h3> <p>Venables, W. N. and Ripley, B. D. (2002) <em>Modern Applied Statistics with S.</em> Fourth edition. Springer. </p> <h3>See Also</h3> <p><code><a href="beav1.html">beav1</a></code> </p> <h3>Examples</h3> <pre> 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) </pre> <hr /><div style="text-align: center;">[Package <em>MASS</em> version 7.3-51.4 <a href="00Index.html">Index</a>]</div> </body></html>