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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: Include an Offset in a Model Formula</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 offset {stats}"><tr><td>offset {stats}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Include an Offset in a Model Formula</h2> <h3>Description</h3> <p>An offset is a term to be added to a linear predictor, such as in a generalised linear model, with known coefficient 1 rather than an estimated coefficient. </p> <h3>Usage</h3> <pre> offset(object) </pre> <h3>Arguments</h3> <table summary="R argblock"> <tr valign="top"><td><code>object</code></td> <td> <p>An offset to be included in a model frame</p> </td></tr> </table> <h3>Details</h3> <p>There can be more than one offset in a model formula, but <code>-</code> is not supported for <code>offset</code> terms (and is equivalent to <code>+</code>). </p> <h3>Value</h3> <p>The input value. </p> <h3>See Also</h3> <p><code><a href="model.extract.html">model.offset</a></code>, <code><a href="model.frame.html">model.frame</a></code>. </p> <p>For examples see <code><a href="glm.html">glm</a></code> and <code><a href="../../MASS/html/Insurance.html">Insurance</a></code> in package <a href="https://CRAN.R-project.org/package=MASS"><span class="pkg">MASS</span></a>. </p> <hr /><div style="text-align: center;">[Package <em>stats</em> version 3.6.0 <a href="00Index.html">Index</a>]</div> </body></html>