Table 1.

Bias (×10⁻³) and MS (×10⁻²) of β̂_I and β̂_E for double directional case. Bias denotes the bias of the mean of the estimates; MS denotes the root-mean-square error. For each parameter, the first row is for β̂_I and the second is for β̂_E. Moreover, the constraints β_5c,1 = β_6c,1 and β_5c,2 = β_6c,2 are imposed.

	n = 40		n = 80		n = 120
	Bias	MS	Bias	MS	Bias	MS
β5d,1 = 1.2	3.15	13.26	4.35	10.04	4.22	7.75
	3.40	13.10	4.36	9.82	3.98	7.60
β5c,1 = β6c,1 = 1	9.29	19.19	1.74	12.76	7.43	10.31
	8.93	18.02	0.89	12.09	7.27	9.81
β5d,2 = 1.2	9.44	13.69	2.05	10.19	0.86	7.80
	9.81	13.29	0.88	9.59	0.43	7.69
β5c,2 = β6c,2 = 1	6.90	18.55	5.00	13.08	0.64	10.53
	6.74	17.50	5.67	12.44	0.62	9.99
β6d,1 = 0.8	5.18	16.85	3.23	9.74	2.49	7.93
	5.69	12.91	3.10	9.65	2.69	7.76
β6d,2 = 0.8	2.34	14.84	1.31	9.78	0.86	8.47
	1.32	13.06	0.98	9.71	0.91	8.07