Revision 6599e015b196d3220041ffaf64414375c87d5be5 authored by Roger Koenker on 14 May 2016, 00:47:02 UTC, committed by cran-robot on 14 May 2016, 00:47:02 UTC
1 parent cba29df
plot.rqs.Rd
\name{plot.rqs}
\alias{plot.rqs}
\title{Visualizing sequences of quantile regressions}
\description{A sequence of coefficient estimates for quantile
regressions with varying \code{tau} parameters is visualized.}
\usage{
\method{plot}{rqs}(x, parm = NULL, ols = TRUE,
mfrow = NULL, mar = NULL, ylim = NULL, main = NULL, col = 1:2, lty = 1:2,
cex = 0.5, pch = 20, type = "b", xlab = "", ylab = "", \dots)
}
\arguments{
\item{x}{an object of class \code{"rqs"} as produce by \code{\link{rq}}
(with a vector of \code{tau} values).}
\item{parm}{a specification of which parameters are to be plotted,
either a vector of numbers or a vector of names. By default, all
parameters are considered.}
\item{ols}{logical. Should a line for the OLS coefficient (as estimated
by \code{\link[stats]{lm}}) be added?}
\item{mfrow, mar, ylim, main}{graphical parameters. Suitable defaults are chosen
based on the coefficients to be visualized.}
\item{col, lty}{graphical parameters. For each parameter, the first
element corresponds to the \code{rq} coefficients and the second to
the \code{lm} coefficients.}
\item{cex, pch, type, xlab, ylab, \dots}{further graphical parameters
passed to \code{\link[graphics]{plot}}.}
}
\details{The \code{plot} method for \code{"rqs"} objects visualizes the
coefficients only, confidence bands can be added by using the \code{plot}
method for the associated \code{"summary.rqs"} object.}
\seealso{\code{\link{rq}}, \code{\link{plot.summary.rqs}}}
\value{A matrix with all coefficients visualized is returned invisibly.}
\examples{
## fit Engel models (in levels) for tau = 0.1, ..., 0.9
data("engel")
fm <- rq(foodexp ~ income, data = engel, tau = 1:9/10)
## visualizations
plot(fm)
plot(fm, parm = 2, mar = c(5.1, 4.1, 2.1, 2.1), main = "", xlab = "tau",
ylab = "income coefficient", cex = 1, pch = 19)
}
\keyword{hplot}
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