Table 1.

Coverage and median width of confidence intervals for different estimators.

	Coverage			Median Width
	${\beta }_1$	${\beta }_2$	${\beta }_3$	${\beta }_1$	${\beta }_2$	${\beta }_3$
GCD	0.94	0.96	0.94	0.25	0.39	0.16
GCDE1	1.00	0.99	1.00	1.61	0.63	1.68
GCDE2	0.98	0.98	0.99	1.94	3.91	0.24
OLS	0.09	0.00	0.35	0.15	0.23	0.09