Table 1.

Type I error of simulation 1

	β=0.15				β=0.3
	Set 1	Set 5	Set 10	Set 15	Set 20	Set 1	Set 5	Set 10	Set 15	Set 20
Weighted	0.007	0.007	0.006	0.009	0.017	0	0	0	0.001	0.001
Unweighted	0.002	0.007	0.008	0.014	0.022	0	0	0	0	0.003
GOSeq	0.019	0	0	0	0	0	0	0	0	0
CAMERA	0	0	0	0	0	0	0	0	0	0

Type I error of selected sets (p-value <0.05) under different β. All four methods maintain the type I error under the controlled level (0.05)