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% file MASS/man/negative.binomial.Rd
% copyright (C) 1994-2006 W. N. Venables and B. D. Ripley
%
\name{negative.binomial}
\alias{negative.binomial}
\title{
Family function for Negative Binomial GLMs
}
\description{
Specifies the information required to fit a Negative Binomial generalized
linear model, with known \code{theta} parameter, using \code{glm()}.
}
\usage{
negative.binomial(theta = stop("'theta' must be specified"), link = "log")
}
\arguments{
\item{theta}{
The known value of the additional parameter, \code{theta}.
}
\item{link}{
The link function, as a character string, name or one-element
character vector specifying one of \code{log}, \code{sqrt}
or \code{identity}, or an object of class
\code{"\link[=family]{link-glm}"}.
}
}
\value{
An object of class \code{"family"}, a list of functions and
expressions needed by \code{glm()} to fit a Negative Binomial
generalized linear model.
}
\seealso{
\code{\link{glm.nb}}, \code{\link{anova.negbin}},
\code{\link{summary.negbin}}
}
\references{
Venables, W. N. and Ripley, B. D. (1999)
\emph{Modern Applied Statistics with S-PLUS.} Third
Edition. Springer.
}
\examples{
# Fitting a Negative Binomial model to the quine data
# with theta = 2 assumed known.
#
glm(Days ~ .^4, family = negative.binomial(2), data = quine)
}
\keyword{regression}
\keyword{models}
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