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\name{stat_quantile}
\alias{stat_quantile}
\alias{StatQuantile}
\title{stat\_quantile}
\description{Continuous quantiles}
\details{
This page describes stat\_quantile, see \code{\link{layer}} and \code{\link{qplot}} for how to create a complete plot from individual components.
}
\section{Aesthetics}{
The following aesthetics can be used with stat\_quantile. Aesthetics are mapped to variables in the data with the aes function: \code{stat\_quantile(aes(x = var))}
\itemize{
\item \code{x}: x position (\strong{required})
\item \code{y}: y position (\strong{required})
}
}
\usage{stat_quantile(mapping = NULL, data = NULL, geom = "quantile",
position = "identity", quantiles = c(0.25, 0.5, 0.75), formula = y ~
x, method = "rq", na.rm = FALSE, ...)}
\arguments{
\item{mapping}{mapping between variables and aesthetics generated by aes}
\item{data}{dataset used in this layer, if not specified uses plot dataset}
\item{geom}{geometric used by this layer}
\item{position}{position adjustment used by this layer}
\item{quantiles}{conditional quantiles of y to calculate and display}
\item{formula}{formula relating y variables to x variables}
\item{method}{NULL}
\item{na.rm}{NULL}
\item{...}{other arguments}
}
\seealso{\itemize{
\item \url{http://had.co.nz/ggplot2/stat_quantile.html}
}}
\value{A \code{\link{layer}}}
\examples{\dontrun{
msamp <- movies[sample(nrow(movies), 1000), ]
m <- ggplot(msamp, aes(y=rating, x=year)) + geom_point()
m + stat_quantile()
m + stat_quantile(quantiles = 0.5)
m + stat_quantile(quantiles = seq(0.1, 0.9, by=0.1))
# Doesn't work. Not sure why.
# m + stat_quantile(method = rqss, formula = y ~ qss(x), quantiles = 0.5)
# Add aesthetic mappings
m + stat_quantile(aes(weight=votes))
# Change scale
m + stat_quantile(aes(colour = ..quantile..), quantiles = seq(0.05, 0.95, by=0.05))
m + stat_quantile(aes(colour = ..quantile..), quantiles = seq(0.05, 0.95, by=0.05)) +
scale_colour_gradient2(midpoint=0.5, low="green", mid="yellow", high="green")
# Set aesthetics to fixed value
m + stat_quantile(colour="red", size=2, linetype=2)
# Use qplot instead
qplot(year, rating, data=movies, geom="quantile")
}}
\author{Hadley Wickham, \url{http://had.co.nz/}}
\keyword{hplot}
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