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\item{contrasts}{an optional list. See the \code{contrasts.arg}
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\item{contrasts}{an optional list. See the \code{contrasts.arg}
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of \code{\link{model.matrix.default}}.}
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of \code{\link{model.matrix.default}}.}
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\item{offset}{this can be used to specify an \emph{a priori} known
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\item{offset}{this can be used to specify an \emph{a priori} known
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component to be included in the linear predictor during fitting.
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component to be included in the linear predictor during fitting.
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This should be \code{NULL} or a numeric vector of length equal to
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This should be \code{NULL} or a numeric vector or matrix of extents
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the number of cases. One or more \code{\link{offset}} terms can be
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matching those of the response. One or more \code{\link{offset}} terms can be
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included in the formula instead or as well, and if more than one are
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included in the formula instead or as well, and if more than one are
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specified their sum is used. See \code{\link{model.offset}}.}
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specified their sum is used. See \code{\link{model.offset}}.}
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\item{\dots}{additional arguments to be passed to the low level
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\item{\dots}{additional arguments to be passed to the low level
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regression fitting functions (see below).}
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regression fitting functions (see below).}
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