Table 1.

Description of the data sets.

Data set	Samples	Probes	Classes	SDR	Types	Reference
GSE3744	47	54675	2	0.00086	Breast cancer	Richardson et al., 2006
GSE25099	79	17881	2	0.00441	Oral cancer	Peng et al., 2011
GSE26712	195	22283	2	0.00875	Ovarian cancer	Bonome et al., 2008
GSE2280	27	22283	2	0.00121	Squamous cell carcinoma	O'Donnell et al., 2005
GSE7670	66 (54*)	22283	2	0.00296	Lung cancer	Su et al., 2007
GSE4290	180	54613	2	0.00329	Brain cancer	Sun et al., 2006

^*Total 27 paired samples are used in this example.

Samples/dimensions ratio (SDR) refers to the ratio between the number of samples and the number of dimensions (or features).