Table 2. Type I error rates for evaluating GI effects (nominal alpha = 0.05).

Model	CCRET	PLINKenrich	PLINK enrich.dup	PLINK enrich.del
(A) Between-locus heterogeneity	0.041	0.044	0.051	0.042
(B) Within-locus heterogeneity	0.043	0.051	0.052	0.043