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\value{
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\value{
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  \code{unstack} produces a list of columns according to the formula
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  \code{unstack} produces a list of columns according to the formula
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  \code{form}.  If all the columns have the same length, the resulting
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  \code{form}.  If all the columns have the same length, the resulting
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  list is coerced to a data frame.
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  list is coerced to a data frame.
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  \code{stack} produces a data frame with two columns:
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  \code{stack} produces a data frame with two columns:
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  \item{values}{the result of concatenating the selected vectors in
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  \item{values}{the result of concatenating the selected vectors in
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    \code{x}.}
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    \code{x}.}
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  \item{ind}{a factor indicating from which vector in \code{x} the
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  \item{ind}{a factor indicating from which vector in \code{x} the
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    observation originated.}
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    observation originated.}