Vector of sample names corresponding to the column headers containing the
data in both the copy number (acgh.data) and expression (expr.data) example datasets.
Pollack JR, Sorlie T, Perou CM, Rees CA, Jeffrey SS, Lonning PE, Tibshirani R, Botstein D, Borresen-Dale AL, Brown PO (2002).
Microarray analysis reveals a major direct role of DNA copy number alteration in the transcriptional program of human breast tumors.
Proc Natl Acad Sci USA. 1, 99(20), 12963-8.