Table 1.

Simulation results: Examination of bias at different time points (n=200)

			t=1		t=2		t=3
	Setting	C%	log ϕ1(t)	BIAS	log ϕ1(t)	BIAS	log ϕ1(t)	BIAS
	I	23%	0	0.004	0.283	0.017	0.584	0.008
		40%	0	0.019	0.283	0.022	0.584	−0.007
log ϕ̂1(t)	II	13%	0.496	0.013	0.778	0.004	1.076	0.009
		33%	0.496	0.037	0.778	0.022	1.076	0.017
	III	28%	0.496	0.038	0.778	0.018	1.076	0.012
		46%	0.496	0.058	0.778	0.024	1.076	0.006
	Setting	C%	log RR1(t)	BIAS	log RR1(t)	BIAS	log RR1(t)	BIAS
	I	23%	0	0.004	0.238	0.015	0.429	0.008
		40%	0	0.019	0.238	0.019	0.429	−0.004
$\text{log }{\widehat{\mathit{\text{RR}}}}_1(t)$	II	13%	0.451	0.014	0.619	0.007	0.715	0.011
		33%	0.451	0.036	0.619	0.021	0.715	0.016
	III	28%	0.451	0.037	0.619	0.017	0.715	0.011
		46%	0.451	0.056	0.619	0.024	0.715	0.011
	Setting	C%	Δ1(t)	BIAS	Δ1(t)	BIAS	Δ1(t)	BIAS
	I	23%	0	0.001	−0.036	−0.002	−0.171	−0.002
		40%	0	−0.001	−0.036	−0.004	−0.171	−0.003
Δ̂1(t)	II	13%	−0.042	0.001	−0.197	0.005	−0.502	0.009
		33%	−0.042	−0.001	−0.197	−0.002	−0.502	0.001
	III	28%	−0.042	−0.001	−0.197	−0.002	−0.502	0.001
		46%	−0.042	−0.001	−0.197	−0.001	−0.502	0.005

Setting I: η₁ = 0, η₂ = 0.2, η₃ = 0.5, θ = 1

Setting II: η₁ = 0.5, η₂ = 0.2, η₃ = 0.5, θ = 1

Setting III:η₁ = 0.5, η₂ = 0.2, η₃ = 0.5, θ = 0.25