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Table 2 Number of genes with dye effects. Observed, expected and best fitting mixture distributions of the number of positive log ratios. Observed distribution in the self-self experiment has distinctly heavier tails than the expected binomial null distribution.

From: Pre-processing Agilent microarray data

pos. log ratios 0 1 2 3 4
observed dist 0.176 0.207 0.236 0.205 0.177
binomial (p = 0.5) 0.062 0.250 0.375 0.250 0.062
best fitting mixture 0.177 0.206 0.235 0.206 0.177