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\name{aircraft}
\alias{aircraft}
\docType{data}
\title{Aircraft Data}
\description{
Aircraft Data, deals with 23 single-engine aircraft built
over the years 1947-1979, from Office of Naval Research.
The dependent variable is cost (in units of $100,000)
and the explanatory variables are aspect ratio, lift-to-drag ratio,
weight of plane (in pounds) and maximal thrust.
}
\usage{data(aircraft, package="robustbase")}
\format{
A data frame with 23 observations on the following 5 variables.
\describe{
\item{\code{X1}}{Aspect Ratio}
\item{\code{X2}}{Lift-to-Drag Ratio}
\item{\code{X3}}{Weight}
\item{\code{X4}}{Thrust}
\item{\code{Y}}{Cost}
}
}
\source{
P. J. Rousseeuw and A. M. Leroy (1987)
\emph{Robust Regression and Outlier Detection};
Wiley, page 154, table 22.
}
\examples{
data(aircraft)
summary( lm.airc <- lm(Y ~ ., data = aircraft))
summary(rlm.airc <- MASS::rlm(Y ~ ., data = aircraft))
aircraft.x <- data.matrix(aircraft[,1:4])
c_air <- covMcd(aircraft.x)
c_air
}
\keyword{datasets}
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