Table 3.

Mean Square Error (MSE) in log scale (n = 1500)

RR	Prob (Y = 1)	Contamination rate	Association bet Z and Y: Linear		Association bet Z and Y: Linear		Association bet Z and Y: Non-Linear		Association bet Z and Y: Non-Linear
			Level of association bet Z and X, Z and Y: Moderate		Level of association bet Z and X, Z and Y: Strong		Level of association bet Z and X, Z and Y: Moderate		Level of association bet Z and X, Z and Y: Strong
			LB	RP	LB	RP	LB	RP	LB	RP
1.5	10%	0%	0.025	0.025	0.027	0.027	0.025	0.025	0.024	0.024
		2%	0.026	0.025	0.025	0.024	0.036	0.026	0.033	0.026
		5%	0.049	0.038	0.045	0.038	0.066	0.044	0.063	0.046
	25%	0%	0.008	0.008	0.008	0.008	0.009	0.009	0.008	0.008
		2%	0.010	0.010	0.009	0.010	0.011	0.010	0.013	0.012
		5%	0.018	0.017	0.019	0.019	0.027	0.020	0.038	0.028
	40%	0%	0.004	0.004	0.004	0.004	0.004	0.004	0.004	0.004
		2%	0.005	0.005	0.006	0.006	0.006	0.006	0.008	0.007
		5%	0.010	0.010	0.013	0.014	0.016	0.014	0.027	0.021
2.0	10%	0%	0.028	0.028	0.027	0.027	0.027	0.027	0.029	0.029
		2%	0.040	0.038	0.035	0.035	0.057	0.039	0.053	0.038
		5%	0.105	0.085	0.096	0.081	0.134	0.091	0.135	0.093
	25%	0%	0.009	0.009	0.010	0.010	0.009	0.009	0.009	0.010
		2%	0.012	0.013	0.014	0.014	0.016	0.014	0.018	0.016
		5%	0.034	0.031	0.013	0.035	0.051	0.036	0.065	0.047
	40%	0%	0.005	0.005	0.005	0.005	0.005	0.005	0.005	0.005
		2%	0.007	0.007	0.007	0.008	0.008	0.008	0.011	0.010
		5%	0.018	0.018	0.021	0.022	0.026	0.023	0.039	0.034

Association between Z and X always linear.

LB: Log-Binomial Model.

RP: Robust Poisson.

Mean square error was calculated by taking the sum of the squared bias in log scale and the variances.