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


Gene expression data (500 genes and 38 tumor mRNA samples) 
from the leukemia microarray study of Golub et al. 
The original dataset contains 3051 genes}
\item{golub}{matrix of gene expression levels for the 
38 tumor mRNA samples. Rows correspond to genes 
and columns to mRNA samples.}
\item{golub.cl}{numeric vector encoding the tumor 
classes, 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.}
Golub et al. (1999). Molecular classification of cancer: class
discovery and class prediction by gene expression
monitoring, \emph{Science}, Vol. 286:531-537.\cr

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. }