% File src/library/stats/man/line.Rd
% Part of the R package, http://www.R-project.org
% Copyright 1995-2012 R Core Team
% Distributed under GPL 2 or later

\name{line}
\alias{line}
\alias{residuals.tukeyline}
\title{Robust Line Fitting}
\description{
  Fit a line robustly as recommended in \emph{Exploratory Data Analysis}.
}
\usage{
line(x, y)
}
\arguments{
  \item{x, y}{the arguments can be any way of specifying x-y pairs.  See
    \code{\link{xy.coords}}.}
}
\details{
  Cases with missing values are omitted.

  Long vectors are not supported.
}
\value{
  An object of class \code{"tukeyline"}.

  Methods are available for the generic functions \code{coef},
  \code{residuals}, \code{fitted}, and \code{print}.
}
\references{
  Tukey, J. W. (1977).
  \emph{Exploratory Data Analysis},
  Reading Massachusetts: Addison-Wesley.
}
\seealso{
  \code{\link{lm}}.
}
\examples{
require(graphics)

plot(cars)
(z <- line(cars))
abline(coef(z))
## Tukey-Anscombe Plot :
plot(residuals(z) ~ fitted(z), main = deparse(z$call))
}
\keyword{robust}
\keyword{regression}