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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: Summary Method for Robust Linear Models</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 summary.rlm {MASS}"><tr><td>summary.rlm {MASS}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2> Summary Method for Robust Linear Models </h2> <h3>Description</h3> <p><code>summary</code> method for objects of class <code>"rlm"</code> </p> <h3>Usage</h3> <pre> ## S3 method for class 'rlm' summary(object, method = c("XtX", "XtWX"), correlation = FALSE, ...) </pre> <h3>Arguments</h3> <table summary="R argblock"> <tr valign="top"><td><code>object</code></td> <td> <p>the fitted model. This is assumed to be the result of some fit that produces an object inheriting from the class <code>rlm</code>, in the sense that the components returned by the <code>rlm</code> function will be available. </p> </td></tr> <tr valign="top"><td><code>method</code></td> <td> <p>Should the weighted (by the IWLS weights) or unweighted cross-products matrix be used? </p> </td></tr> <tr valign="top"><td><code>correlation</code></td> <td> <p>logical. Should correlations be computed (and printed)? </p> </td></tr> <tr valign="top"><td><code>...</code></td> <td> <p>arguments passed to or from other methods. </p> </td></tr></table> <h3>Details</h3> <p>This function is a method for the generic function <code>summary()</code> for class <code>"rlm"</code>. It can be invoked by calling <code>summary(x)</code> for an object <code>x</code> of the appropriate class, or directly by calling <code>summary.rlm(x)</code> regardless of the class of the object. </p> <h3>Value</h3> <p>If printing takes place, only a null value is returned. Otherwise, a list is returned with the following components. Printing always takes place if this function is invoked automatically as a method for the <code>summary</code> function. </p> <table summary="R valueblock"> <tr valign="top"><td><code>correlation</code></td> <td> <p>The computed correlation coefficient matrix for the coefficients in the model. </p> </td></tr> <tr valign="top"><td><code>cov.unscaled</code></td> <td> <p>The unscaled covariance matrix; i.e, a matrix such that multiplying it by an estimate of the error variance produces an estimated covariance matrix for the coefficients. </p> </td></tr> <tr valign="top"><td><code>sigma</code></td> <td> <p>The scale estimate. </p> </td></tr> <tr valign="top"><td><code>stddev</code></td> <td> <p>A scale estimate used for the standard errors. </p> </td></tr> <tr valign="top"><td><code>df</code></td> <td> <p>The number of degrees of freedom for the model and for residuals. </p> </td></tr> <tr valign="top"><td><code>coefficients</code></td> <td> <p>A matrix with three columns, containing the coefficients, their standard errors and the corresponding t statistic. </p> </td></tr> <tr valign="top"><td><code>terms</code></td> <td> <p>The terms object used in fitting this model. </p> </td></tr></table> <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="../../base/html/summary.html">summary</a></code> </p> <h3>Examples</h3> <pre> summary(rlm(calls ~ year, data = phones, maxit = 50)) </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>