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  Models specified by \code{scope} can be templates to update
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  Models specified by \code{scope} can be templates to update
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  \code{object} as used by \code{\link{update.formula}}.
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  \code{object} as used by \code{\link{update.formula}}.
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  There is a potential problem in using \code{\link{glm}} fits with a
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  There is a potential problem in using \code{\link{glm}} fits with a
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  variable \code{scale}, as in that case the deviance is not simply
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  variable \code{scale}, as in that case the deviance is not simply
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  related to the maximized log-likelihood. The function
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  related to the maximized log-likelihood. The \code{"glm"} method for
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  \code{\link{extractAIC.glm}} makes the
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  function \code{\link{extractAIC}} makes the
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  appropriate adjustment for a \code{gaussian} family, but may need to be
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  appropriate adjustment for a \code{gaussian} family, but may need to be
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  amended for other cases. (The \code{binomial} and \code{poisson}
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  amended for other cases. (The \code{binomial} and \code{poisson}
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  families have fixed \code{scale} by default and do not correspond
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  families have fixed \code{scale} by default and do not correspond
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  to a particular maximum-likelihood problem for variable \code{scale}.)
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  to a particular maximum-likelihood problem for variable \code{scale}.)
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}
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}