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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: Plot an ACF Object</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 plot.ACF {nlme}"><tr><td>plot.ACF {nlme}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Plot an ACF Object</h2> <h3>Description</h3> <p>an <code>xyplot</code> of the autocorrelations versus the lags, with <code>type = "h"</code>, is produced. If <code>alpha > 0</code>, curves representing the critical limits for a two-sided test of level <code>alpha</code> for the autocorrelations are added to the plot. </p> <h3>Usage</h3> <pre> ## S3 method for class 'ACF' plot(x, alpha, xlab, ylab, grid, ...) </pre> <h3>Arguments</h3> <table summary="R argblock"> <tr valign="top"><td><code>x</code></td> <td> <p>an object inheriting from class <code>ACF</code>, consisting of a data frame with two columns named <code>lag</code> and <code>ACF</code>, representing the autocorrelation values and the corresponding lags. </p> </td></tr> <tr valign="top"><td><code>alpha</code></td> <td> <p>an optional numeric value with the significance level for testing if the autocorrelations are zero. Lines corresponding to the lower and upper critical values for a test of level <code>alpha</code> are added to the plot. Default is <code>0</code>, in which case no lines are plotted. </p> </td></tr> <tr valign="top"><td><code>xlab,ylab</code></td> <td> <p>optional character strings with the x- and y-axis labels. Default respectively to <code>"Lag"</code> and <code>"Autocorrelation"</code>. </p> </td></tr> <tr valign="top"><td><code>grid</code></td> <td> <p>an optional logical value indicating whether a grid should be added to plot. Default is <code>FALSE</code>.</p> </td></tr> <tr valign="top"><td><code>...</code></td> <td> <p>optional arguments passed to the <code>xyplot</code> function.</p> </td></tr> </table> <h3>Value</h3> <p>an <code>xyplot</code> Trellis plot. </p> <h3>Author(s)</h3> <p>José Pinheiro and Douglas Bates <a href="mailto:bates@stat.wisc.edu">bates@stat.wisc.edu</a></p> <h3>See Also</h3> <p><code><a href="ACF.html">ACF</a></code>, <code><a href="../../lattice/html/xyplot.html">xyplot</a></code></p> <h3>Examples</h3> <pre> fm1 <- lme(follicles ~ sin(2*pi*Time) + cos(2*pi*Time), Ovary) plot(ACF(fm1, maxLag = 10), alpha = 0.01) </pre> <hr /><div style="text-align: center;">[Package <em>nlme</em> version 3.1-139 <a href="00Index.html">Index</a>]</div> </body></html>