\name{cushny}
\alias{cushny}
\docType{data}
\title{
A data set from Cushny and Peebles (1905) on the effect of three drugs on hours of sleep, used by Student (1908)
}
\description{The classic data set used by Gossett (publishing as Student) for the introduction of the t-test.  The design was a within subjects study with hours of sleep in a control condition compared to those in 3 drug conditions.  Drug1 was 06mg of L Hscyamine, Drug 2L and Drug2R were .6 mg of  Left and Right isomers of Hyoscine.  The detal1, delta2L and delta2R are changes from the baseline control.  
}
\usage{data(cushny)}
\format{
  A data frame with 10 observations on the following 7 variables.
  \describe{
    \item{\code{Control}}{Hours of sleep in a control condition}
    \item{\code{drug1}}{Hours of sleep in Drug condition 1}
    \item{\code{drug2L}}{Hours of sleep in Drug condition 2}
    \item{\code{drug2R}}{Hours of sleep in Drug condition 3 (an isomer of the drug in condition 2}
    \item{\code{delta1}}{Change from control, drug 1}
    \item{\code{delta2L}}{Change from control, drug 2L}
    \item{\code{delta2R}}{Change from control, drug 2R}
  }
}
\details{The original analysis by Student is used as an example for the t-test function, both as a paired t-test and a two group t-test.  The data are also useful for a repeated measures analysis of variance.  

}

\source{Cushny, A.R. and Peebles, A.R. (1905) The action of optical isomers: II hyoscines.  The Journal of Physiology 32, 501-510.

Student (1908) The probable error of the mean.  Biometrika, 6 (1) , 1-25.

}
\references{See also the data set sleep and the examples for the t.test}

\examples{
data(cushny)
with(cushny, t.test(drug1,drug2L,paired=TRUE)) #within subjects 

error.bars(cushny[1:4],within=TRUE,ylab="Hours of sleep",xlab="Drug condition",main="95\% confidence of within subject effects")
}
\keyword{datasets}