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. 2007 Jun 25;8:220. doi: 10.1186/1471-2105-8-220

Figure 2.

Figure 2

Each point represents the log2 (R/G) value for the specified genes on a particular array. The Pearson correlation and the biweight correlation give opposite values for these group 2 pairs. Due to the outlying values, it is clear that the Pearson correlation is quite misleading.