Figure 4
From: A robust measure of correlation between two genes on a microarray
Each point represents the log2 (R/G) value for the specified genes on a particular array. The biweight correlation is close to zero, and the Pearson correlation gives a high absolute correlation. Group 4 pairs are the most worrisome; it would be a mistake to think that two genes were highly correlated when that high correlation is simply due to one outlying point.