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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: Extract corStruct Log-Determinant</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 logDet.corStruct {nlme}"><tr><td>logDet.corStruct {nlme}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Extract corStruct Log-Determinant</h2> <h3>Description</h3> <p>This method function extracts the logarithm of the determinant of a square-root factor of the correlation matrix associated with <code>object</code>, or the sum of the log-determinants of square-root factors of the list of correlation matrices associated with <code>object</code>. </p> <h3>Usage</h3> <pre> ## S3 method for class 'corStruct' logDet(object, covariate, ...) </pre> <h3>Arguments</h3> <table summary="R argblock"> <tr valign="top"><td><code>object</code></td> <td> <p>an object inheriting from class <code>"<a href="corClasses.html">corStruct</a>"</code>, representing a correlation structure.</p> </td></tr> <tr valign="top"><td><code>covariate</code></td> <td> <p>an optional covariate vector (matrix), or list of covariate vectors (matrices), at which values the correlation matrix, or list of correlation matrices, are to be evaluated. Defaults to <code>getCovariate(object)</code>.</p> </td></tr> <tr valign="top"><td><code>...</code></td> <td> <p>some methods for this generic require additional arguments. None are used in this method.</p> </td></tr> </table> <h3>Value</h3> <p>the log-determinant of a square-root factor of the correlation matrix associated with <code>object</code>, or the sum of the log-determinants of square-root factors of the list of correlation matrices associated with <code>object</code>. </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="logLik.corStruct.html">logLik.corStruct</a></code>, <code><a href="corMatrix.corStruct.html">corMatrix.corStruct</a></code>, <code><a href="logDet.html">logDet</a></code> </p> <h3>Examples</h3> <pre> cs1 <- corAR1(0.3) logDet(cs1, covariate = 1:4) </pre> <hr /><div style="text-align: center;">[Package <em>nlme</em> version 3.1-139 <a href="00Index.html">Index</a>]</div> </body></html>