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<table width="100%" summary="page for summary.negbin {MASS}"><tr><td>summary.negbin {MASS}</td><td align="right">R Documentation</td></tr></table>
<h2>Summary Method Function for Objects of Class 'negbin'</h2>
<h3>Description</h3>
<p>
Identical to <code>summary.glm</code>, but with three lines of additional output: the
ML estimate of theta, its standard error, and twice the log-likelihood
function.
</p>
<h3>Usage</h3>
<pre>
## S3 method for class 'negbin':
summary(object, dispersion = 1, correlation = FALSE, ...)
</pre>
<h3>Arguments</h3>
<table summary="R argblock">
<tr valign="top"><td><code>object</code></td>
<td>
Fitted model object of class <code>negbin</code> inheriting from <code>glm</code> and <code>lm</code>.
Typically the output of <code>glm.nb</code>.
</td></tr>
<tr valign="top"><td><code>dispersion</code></td>
<td>
as for <code>summary.glm</code>, with a default of 1.
</td></tr>
<tr valign="top"><td><code>correlation</code></td>
<td>
as for <code>summary.glm</code>.
</td></tr>
<tr valign="top"><td><code>...</code></td>
<td>
arguments passed to or from other methods.
</td></tr>
</table>
<h3>Details</h3>
<p>
<code>summary.glm</code> is used to produce the majority of the output and supply the
result.
This function is a method for the generic function
<code>summary()</code> for class <code>"negbin"</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.negbin(x)</code> regardless of the
class of the object.
</p>
<h3>Value</h3>
<p>
As for <code>summary.glm</code>; the additional lines of output are not included in
the resultant object.</p>
<h3>Side Effects</h3>
<p>
A summary table is produced as for <code>summary.glm</code>, with the additional
information described above.
</p>
<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="../../Zelig/html/summary.zelig.html">summary</a></code>, <code><a href="glm.nb.html">glm.nb</a></code>, <code><a href="negative.binomial.html">negative.binomial</a></code>, <code><a href="anova.negbin.html">anova.negbin</a></code>
</p>
<h3>Examples</h3>
<pre>
summary(glm.nb(Days ~ Eth*Age*Lrn*Sex, quine, link = log))
</pre>
<hr><div align="center">[Package <em>MASS</em> version 7.2-44 <a href="00Index.html">Index]</a></div>
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