The R Project SVN R

\name{sleep}
\alias{sleep}
\title{Students' Sleep Data}
\usage{data(sleep)}
\description{
    Data which show the effect of two soporific drugs (increase in hours
    of sleep) on groups consisting of 10 patients each.
}
\format{
    A data frame with 20 observations on 2 variables.
    \tabular{rlll}{
        [, 1] \tab extra \tab numeric \tab increase in hours of sleep
    \cr
    [, 2] \tab group \tab factor  \tab patient group
    }
}
\source{
    Student (1908),
    The probable error of the mean.
    \emph{Biometrika}, \bold{6}, 20.
}
\references{
    Scheffé, Henry (1959):
    \emph{The analysis of variance}.
    New York, NY: Wiley.
}
\examples{
data(sleep)
## ANOVA
anova(lm(extra ~ group, data = sleep))
}
\keyword{datasets}