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  collapse the contingency table into flat form.  If neither of these
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  collapse the contingency table into flat form.  If neither of these
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  two is given, the last variable is used for the columns.  If both are
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  two is given, the last variable is used for the columns.  If both are
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  given and their union is a proper subset of all variables involved,
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  given and their union is a proper subset of all variables involved,
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  the other variables are summed out.
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  the other variables are summed out.
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  When the arguments are \R expressions interpreted as factors,
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  additional arguments will be passed to \code{table} to control how
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  the variable names are displayed; see the last example below.
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  Function \code{\link{ftable.formula}} provides a formula method for
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  Function \code{\link{ftable.formula}} provides a formula method for
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  creating flat contingency tables.
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  creating flat contingency tables.
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}
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}
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\seealso{
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\seealso{
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  \code{\link{ftable.formula}} for the formula interface (which allows a
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  \code{\link{ftable.formula}} for the formula interface (which allows a
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## Start with a data frame.
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## Start with a data frame.
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data(mtcars)
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data(mtcars)
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x <- ftable(mtcars[c("cyl", "vs", "am", "gear")])
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x <- ftable(mtcars[c("cyl", "vs", "am", "gear")])
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x
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x
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ftable(x, row.vars = c(2, 4))
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ftable(x, row.vars = c(2, 4))
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## Start with expressions, use table()'s "dnn" to change labels
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ftable(mtcars$cyl, mtcars$vs, mtcars$am, mtcars$gear, row.vars = c(2, 4),
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       dnn = c("Cylinders", "V/S", "Transmission", "Gears"))
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}
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 }
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\keyword{category}
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\keyword{category}