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Edit File: corClasses.html
<!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: Correlation Structure Classes</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 corClasses {nlme}"><tr><td>corClasses {nlme}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Correlation Structure Classes</h2> <h3>Description</h3> <p>Standard classes of correlation structures (<code>corStruct</code>) available in the <code>nlme</code> package. </p> <h3>Value</h3> <p>Available standard classes: </p> <table summary="R valueblock"> <tr valign="top"><td><code>corAR1</code></td> <td> <p>autoregressive process of order 1.</p> </td></tr> <tr valign="top"><td><code>corARMA</code></td> <td> <p>autoregressive moving average process, with arbitrary orders for the autoregressive and moving average components.</p> </td></tr> <tr valign="top"><td><code>corCAR1</code></td> <td> <p>continuous autoregressive process (AR(1) process for a continuous time covariate).</p> </td></tr> <tr valign="top"><td><code>corCompSymm</code></td> <td> <p>compound symmetry structure corresponding to a constant correlation.</p> </td></tr> <tr valign="top"><td><code>corExp</code></td> <td> <p>exponential spatial correlation.</p> </td></tr> <tr valign="top"><td><code>corGaus</code></td> <td> <p>Gaussian spatial correlation.</p> </td></tr> <tr valign="top"><td><code>corLin</code></td> <td> <p>linear spatial correlation.</p> </td></tr> <tr valign="top"><td><code>corRatio</code></td> <td> <p>Rational quadratics spatial correlation.</p> </td></tr> <tr valign="top"><td><code>corSpher</code></td> <td> <p>spherical spatial correlation.</p> </td></tr> <tr valign="top"><td><code>corSymm</code></td> <td> <p>general correlation matrix, with no additional structure.</p> </td></tr> </table> <h3>Note</h3> <p>Users may define their own <code>corStruct</code> classes by specifying a <code>constructor</code> function and, at a minimum, methods for the functions <code>corMatrix</code> and <code>coef</code>. For examples of these functions, see the methods for classes <code>corSymm</code> and <code>corAR1</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>References</h3> <p>Pinheiro, J.C., and Bates, D.M. (2000) "Mixed-Effects Models in S and S-PLUS", Springer. </p> <h3>See Also</h3> <p><code><a href="corAR1.html">corAR1</a></code>, <code><a href="corARMA.html">corARMA</a></code>, <code><a href="corCAR1.html">corCAR1</a></code>, <code><a href="corCompSymm.html">corCompSymm</a></code>, <code><a href="corExp.html">corExp</a></code>, <code><a href="corGaus.html">corGaus</a></code>, <code><a href="corLin.html">corLin</a></code>, <code><a href="corRatio.html">corRatio</a></code>, <code><a href="corSpher.html">corSpher</a></code>, <code><a href="corSymm.html">corSymm</a></code>, <code><a href="summary.corStruct.html">summary.corStruct</a></code></p> <hr /><div style="text-align: center;">[Package <em>nlme</em> version 3.1-139 <a href="00Index.html">Index</a>]</div> </body></html>