Table 2.

Simulation results for adjusted association

	θ0 = θ1 = 1:6				θ0 = 2; θ1 = 4
n	Bias	SE	SEE	95% CI	Bias	SE	SEE	95% CI
50	−0.02	0.39	0.37	0.93	−0.54	0.42	0.40	0.80
100	−0.01	0.28	0.26	0.94	−0.67	0.30	0.29	0.65
150	0.01	0.23	0.22	0.95	−0.89	0.24	0.24	0.51

noindent Note: θ₀ and θ₁ denote dependence parameters in Clayton-Oakes model for control and treatment groups, respectively. In situation where θ₁ ≠ θ₂, bias is calculated using the true theta value is 2. SE is the standard error of θ across simulation samples; SEE denotes average of standard errors based on empirical distribution of θ.