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\encoding{UTF-8}
\name{lines.roc}
\alias{lines.roc}
\alias{lines.roc.roc}
\alias{lines.smooth.roc}
\alias{lines.roc.smooth.roc}
\alias{lines.roc.default}
\alias{lines.roc.formula}
\title{
Add a ROC line to a ROC plot
}
\description{
This convenience function adds a ROC line to a ROC curve.
}
\usage{
\S3method{lines}{roc}(x, ...)
\S3method{lines}{smooth.roc}(x, ...)
\S3method{lines.roc}{roc}(x, lwd=2, ...)
\S3method{lines.roc}{formula}(x, data, subset, na.action, ...)
\S3method{lines.roc}{default}(x, predictor, ...)
\S3method{lines.roc}{smooth.roc}(x, ...)
}
\arguments{
\item{x}{a roc object from the \link{roc} function (for plot.roc.roc),
a formula (for plot.roc.formula) or a response vector (for
plot.roc.default).
}
\item{predictor, data}{arguments for the \link{roc} function.}
\item{subset,na.action}{arguments for \code{\link{model.frame}}}
\item{lwd}{line width (see \code{\link{par}}).}
\item{\dots}{graphical parameters for \code{\link{lines}}, and
especially \code{type} (see \code{\link{plot.default}}) and
arguments for \code{\link{par}} such as \code{col} (color),
\code{lty} (line type) or line characteristics \code{lend},
\code{ljoin} and \code{lmitre}.
}
}
\value{
This function returns a list of class \dQuote{roc} invisibly. See \code{\link{roc}} for more details.
}
\seealso{
\code{\link{roc}}, \code{\link{plot.roc}}
}
\examples{
# Create a few ROC curves:
data(aSAH)
roc.s100b <- roc(aSAH$outcome, aSAH$s100b)
roc.wfns <- roc(aSAH$outcome, aSAH$wfns)
# We need a plot to be ready
plot(roc.s100b, type = "n") # but don't actually plot the curve
# Add the line
lines(roc.s100b, type="b", pch=21, col="blue", bg="grey")
# Add the line of an other ROC curve
lines(roc.wfns, type="o", pch=19, col="red")
# Without using 'lines':
rocobj <- plot.roc(aSAH$outcome, aSAH$s100b, type="b", pch=21, col="blue", bg="grey")
}
\keyword{univar}
\keyword{nonparametric}
\keyword{utilities}
\keyword{aplot}
\keyword{hplot}
\keyword{roc}
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