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Observed data probabilities by MAF. X-axis N·MAF. The y-axis shows the probability of each special data type conditional on the SNP being polymorphic: occurring only in cases (red), once in controls and zero times in cases (blue) and all other (black). Green = expected log-odds-ratio (OR) of sampled SNPs (same numeric scale). The log-ORs are assumed to be distributed left: N(0, 1); center: N(0, 0.52); right: N(0, 0.252); other settings are as in Figure 2.
