Figure 4.

Contour plots of densities of CV for gene-expression indexes versus probe-level data. (a) CV density for MAS5 indexes versus probe-level, (b) CV density for dChip PM-only versus probe-level (c) CV density for known positives only (n = 1,274) for MAS5 versus probe-level and (d) CV density for known positives for dChip PM-only versus probe-level. Dashed line indicates equal CV. Dotted line indicates optimal CV ratio = .