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\method{model.frame}{glm}(formula, \dots)
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\method{model.frame}{glm}(formula, \dots)
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\method{model.frame}{lm}(formula, \dots)
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\method{model.frame}{lm}(formula, \dots)
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}
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}
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\arguments{
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\arguments{
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  \item{formula}{a model formula or an \R object.}
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  \item{formula}{a model \code{\link{formula}} or \code{\link{terms}}
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    object or an \R object.}
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  \item{data}{\code{data.frame}, list, \code{environment} or object
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  \item{data}{\code{data.frame}, list, \code{environment} or object
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    coercible to \code{data.frame} containing the variables in
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    coercible to \code{data.frame} containing the variables in
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    \code{formula}.  Neither a matrix nor an array will be accepted.}
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    \code{formula}.  Neither a matrix nor an array will be accepted.}
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  The rest of this section applies only to the default method.
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  The rest of this section applies only to the default method.
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  If either \code{formula} or \code{data} is already a model frame (a
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  If either \code{formula} or \code{data} is already a model frame (a
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  data frame with a \code{"terms"} attribute and the other is missing,
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  data frame with a \code{"terms"} attribute and the other is missing,
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  the model frame is returned.  Unless \code{formula} is a terms object,
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  \code{terms} is called on it.  (If you wish to use the
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  \code{keep.order} argument of \code{terms.formula}, pass a terms
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  the model frame is returned.
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  object rather than a formula.)
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  All the variables in \code{formula}, \code{subset} and in \code{\dots}
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  All the variables in \code{formula}, \code{subset} and in \code{\dots}
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  are looked for first in \code{data} and then in the environment of
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  are looked for first in \code{data} and then in the environment of
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  \code{formula} (see the help for \code{\link{formula}()} for further
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  \code{formula} (see the help for \code{\link{formula}()} for further
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  details) and collected into a data frame. Then the \code{subset}
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  details) and collected into a data frame. Then the \code{subset}