\name{dat2}
 \docType{data}
 \alias{dat2}
 \title{Simulated gene expression data.}
 \description{
 This data set is a simulated gene expression matrix "dat2" with 500
 genes and 20 arrays used for testing predictions based on the data "dat"
 }
 \usage{dat2}
 \format{matrix}
 \keyword{datasets}