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    data frame}
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    data frame}
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  \item{form}{a two-sided formula whose left side evaluates to the
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  \item{form}{a two-sided formula whose left side evaluates to the
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    vector to be unstacked and whose right side evaluates to the
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    vector to be unstacked and whose right side evaluates to the
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    indicator of the groups to create.  Defaults to \code{formula(x)}
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    indicator of the groups to create.  Defaults to \code{formula(x)}
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    in \code{unstack.data.frame}.}
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    in \code{unstack.data.frame}.}
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  \item{\dots}{further arguments passed to or from other methods.}
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}
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}
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\details{
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\details{
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  The \code{stack} function is used to transform data available as
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  The \code{stack} function is used to transform data available as
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  separate columns in a data frame or list into a single column that can
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  separate columns in a data frame or list into a single column that can
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  be used in an analysis of variance model or other linear model.  The
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  be used in an analysis of variance model or other linear model.  The