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. 2014 Sep 26;9(9):e108103. doi: 10.1371/journal.pone.0108103

Figure 1. Quantile-quantile plot of significance level and Type I error rate.

Figure 1

The Type I error is evaluated by GEE-GMDR method with digenic, trigenic and tetragenic models in presence of no gene-gene interaction and no residual correlation. The reference line is a diagonal line with unit slope through the origin. An unbiased method is expected to give the points falling on or near the reference line (i.e., Type I error rate is very close to the nominal level).