Table 1.

Coverage rate for 95% confidence intervals

	Sample Size	Coverage
		t=0.2	t=0.4	t=0.6	t=0.8
Model i	100	0.95	0.95	0.94	0.94
	200	0.95	0.94	0.95	0.95
	500	0.94	0.94	0.94	0.95
Model ii	100	0.95	0.95	0.95	0.95
	200	0.94	0.94	0.93	0.93
	500	0.94	0.95	0.95	0.94