Table 4.

Power of multitrait tests for m = 8 continuous traits under significance level α = 10⁻⁴. The MAFs of SNP are 0.1 and 0.2 in the two populations, respectively. Q is the m-DF omnibus Wald test; T and T′ are the 1-DF Wald tests assuming common or common scaled effect. (Q_s, T_s, T_s′) are the corresponding GEE-based m-DF omnibus test and 1-DF tests assuming a common effect or common scaled effect. The highest powered tests are bold-faced.

(γ1,…, γ8)	Q	T	T′	Q s	T s	T s′
ρ = 0.5
γ 1 = 0.3, γi>1 = 0	0.303	0.001	0	0.229	0	0
(.3, .2, .1, .05,0,…, 0)	0.696	0	0.008	0.599	0	0.005
γ 1 = 0.2, γi>1 = 0.15	0.045	0.201	0.220	0.030	0.169	0.195
γ i = 0.15	0.048	0.237	0.193	0.032	0.204	0.170
ρ = 0
γ 1 = 0.3, γi>1 = 0	0.063	0.001	0.004	0.043	0.001	0.002
(.3, .2, .1, .05,0,…, 0)	0.467	0.156	0.224	0.372	0.102	0.152
γ 1 = 0.2, γi>1 = 0.15	0.934	0.996	0.997	0.887	0.992	0.993
γ i = 0.15	0.912	0.995	0.994	0.855	0.989	0.988