\name{golub}
\alias{golub}
\alias{golub.cl}
\alias{golub.gnames}

\title{sub set of the Gene expression dataset from Golub et al. (1999)}

\usage{
data(golub)
}

\description{
  Gene expression data (500 genes and 38 tumor mRNA samples) 
  from the leukemia microarray study of Golub et al. 
  (1999). Original data set contain 3051 genes }

\value{
  \item{golub}{matrix of gene expression levels for the 
       38 tumor mRNA samples, rows correspond to genes 
        (500 genes) and columns to mRNA samples.}
  \item{golub.cl}{numeric vector indicating the tumor 
       class, 27 acute lymphoblastic leukemia (ALL) cases 
     (code 0) and 11 acute myeloid leukemia (AML) cases (code 1). }
  \item{golub.gnames}{a matrix containing the names of 
     the 500 genes for the expression matrix \code{golub}. 
     The three columns correspond to the gene \code{index}, 
     \code{ID}, and \code{Name}, respectively.}
}

\source{
Golub et al. (1999). Molecular classification of cancer: class
discovery and class prediction by gene expression
monitoring, \emph{Science}, Vol. 286:531-537.\cr
\url{http://www-genome.wi.mit.edu/MPR/}
.}

\references{
S. Dudoit, J. Fridlyand, and T. P. Speed (2002). 
Comparison of discrimination methods for the  classification 
of tumors using gene expression data. 
\emph{Journal of the American Statistical Association}, Vol. 97, No. 457, p. 77--87. }

\keyword{datasets}