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\arguments{
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\arguments{
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  \item{formula}{a \code{\link{formula}}, such as \code{y ~ x}.}
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  \item{formula}{a \code{\link{formula}}, such as \code{y ~ x}.}
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  \item{data}{a data.frame (or list) from which the variables in
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  \item{data}{a data.frame (or list) from which the variables in
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    \code{formula} should be taken.}
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    \code{formula} should be taken.}
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  \item{\dots}{Further graphical parameters may also be passed as
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  \item{\dots}{Further graphical parameters may also be passed as
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    arguments, see \code{\link{par}}.}
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    arguments, see \code{\link{par}}.  \code{horizontal = TRUE}
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    is also accepted.}
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  \item{subset}{an optional vector specifying a subset of observations
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  \item{subset}{an optional vector specifying a subset of observations
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    to be used in the fitting process.}
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    to be used in the fitting process.}
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  \item{ylab}{the y label of the plot(s).}
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  \item{ylab}{the y label of the plot(s).}
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  \item{ask}{logical, see \code{\link{par}}.}
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  \item{ask}{logical, see \code{\link{par}}.}
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}
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}
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  \code{data} is a list or a data frame. The terms of the formula and
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  \code{data} is a list or a data frame. The terms of the formula and
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  those arguments in \code{\dots} that are of the same length as
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  those arguments in \code{\dots} that are of the same length as
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  \code{data} are subjected to the subsetting specified in
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  \code{data} are subjected to the subsetting specified in
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  \code{subset}. If the formula in \code{plot.formula} contains more
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  \code{subset}. If the formula in \code{plot.formula} contains more
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  than one non-response term, a series of plots of y against each term
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  than one non-response term, a series of plots of y against each term
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  is given. A plot against the running index can be specified as
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  is given.  A plot against the running index can be specified as
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  \code{plot(y~1)}.
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  \code{plot(y~1)}.
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  If \code{y} is an object (ie. has a \code{\link[base]{class}} attribute)
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  If \code{y} is an object (ie. has a \code{\link[base]{class}} attribute)
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  then \code{plot.formula} looks for a plot method for that class first.
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  then \code{plot.formula} looks for a plot method for that class first.
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  Otherwise, the class of \code{x} will determine the type of the plot.
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  For factors this will be a parallel boxplot, and argument
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  \code{horizontal = TRUE} can be used (see \code{\link{boxplot}}).
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}
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}
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\value{
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\value{
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  These functions are invoked for their side effect of drawing 
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  These functions are invoked for their side effect of drawing 
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  in the active graphics device.
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  in the active graphics device.
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}
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}