TABLE 5.

Type I error results for β_X1 = 0 are given for 1000 simulated datasets for the proposed method

Se a	Sp b	${\widehat{\delta }}_{(1)}$ c	CR d	Type I Error
0.80	0.90	0.30	0.55	0.048
			0.90	0.042
		0.60	0.55	0.058
			0.90	0.042
0.90	0.80	0.30	0.55	0.043
			0.90	0.039
		0.60	0.55	0.049
			0.90	0.044

Note: Let β_X1 = log(1.5), β_Z1 = log(0.7), and β_Z2 = log(1.3); e is normally distributed with mean zero.

^aSe = Sensitivity.

^bSp = Specificity.

^c${\widehat{\delta }}_{(1)}$ = Estimate of attenuation coefficient.

^dCR = True censoring rate.