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. Author manuscript; available in PMC: 2008 Apr 1.
Published in final edited form as: Hum Mol Genet. 2006 Dec 7;16(1):24–35. doi: 10.1093/hmg/ddl441

Figure 5.

Figure 5

Q-Q plot of logistic regression ANOVA deviance produced from samples added to Stage I samples at Stage II. Because these samples are independent of Stage I samples used for the SNP selection from pooled genotyping the test statistic is expected to largely follow the null distribution (Chi-square distribution with 2 degrees of freedom). Due to the lower power of this sample set compared to the combined set of samples and the small effect sizes found in this study, any possible associations are not expected to cluster together at low p-values, thereby changing the linear shape of this Q-Q plot. The dotted line represents 95% point-wise confidence envelope of expected null distribution.