\HeaderA{summary.negbin}{Summary Method Function for Objects of Class 'negbin'}{summary.negbin}
\aliasA{print.summary.negbin}{summary.negbin}{print.summary.negbin}
\keyword{models}{summary.negbin}
\begin{Description}\relax
Identical to \code{summary.glm}, but with three lines of additional output: the
ML estimate of theta, its standard error, and twice the log-likelihood
function.
\end{Description}
\begin{Usage}
\begin{verbatim}
## S3 method for class 'negbin':
summary(object, dispersion = 1, correlation = TRUE, ...)
\end{verbatim}
\end{Usage}
\begin{Arguments}
\begin{ldescription}
\item[\code{object}] Fitted model object of class \code{negbin} inheriting from \code{glm} and \code{lm}.
Typically the output of \code{glm.nb}.

\item[\code{dispersion}] as for \code{summary.glm}, with a default of 1.

\item[\code{correlation}] as for \code{summary.glm}.

\item[\code{...}] arguments passed to or from other methods.

\end{ldescription}
\end{Arguments}
\begin{Details}\relax
\code{summary.glm} is used to produce the majority of the output and supply the
result.
This function is a method for the generic function
\code{summary()} for class \code{"negbin"}.
It can be invoked by calling \code{summary(x)} for an
object \code{x} of the appropriate class, or directly by
calling \code{summary.negbin(x)} regardless of the
class of the object.
\end{Details}
\begin{Value}
As for \code{summary.glm}; the additional lines of output are not included in
the resultant object.
\end{Value}
\begin{Section}{Side Effects}
A summary table is produced as for \code{summary.glm}, with the additional
information described above.
\end{Section}
\begin{References}\relax
Venables, W. N. and Ripley, B. D. (2002)
\emph{Modern Applied Statistics with S.} Fourth edition.  Springer.
\end{References}
\begin{SeeAlso}\relax
\code{\LinkA{summary}{summary}}, \code{\LinkA{glm.nb}{glm.nb}}, \code{\LinkA{negative.binomial}{negative.binomial}}, \code{\LinkA{anova.negbin}{anova.negbin}}
\end{SeeAlso}
\begin{Examples}
\begin{ExampleCode}
summary(glm.nb(Days ~ Eth*Age*Lrn*Sex, quine, link = log))
\end{ExampleCode}
\end{Examples}