\HeaderA{offset}{Include an Offset in a Model Formula}{offset}
\keyword{models}{offset}
\begin{Description}\relax
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.
\end{Description}
\begin{Usage}
\begin{verbatim}
offset(object)
\end{verbatim}
\end{Usage}
\begin{Arguments}
\begin{ldescription}
\item[\code{object}] An offset to be included in a model frame
\end{ldescription}
\end{Arguments}
\begin{Details}\relax
There can be more than one offset in a model formula, but \code{-} is
not supported for \code{offset} terms (and is equivalent to \code{+}).
\end{Details}
\begin{Value}
The input value.
\end{Value}
\begin{SeeAlso}\relax
\code{\LinkA{model.offset}{model.offset}}, \code{\LinkA{model.frame}{model.frame}}.

For examples see \code{\LinkA{glm}{glm}} and
\code{\LinkA{Insurance}{Insurance}} in package \pkg{MASS}.
\end{SeeAlso}

