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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