Table VI.

Locally D-optimal designs {d₀ = 0, d₁, d₂, d₃, d₄ = 0.15; 1/5,…, 1/5} for the exp+weib model for different nominal values. The D-efficiencies of designs ξ_u and ${\xi }_0={\xi }_D^{\ast }(\theta ){\mid }_{\theta =(0.9,10.5,0.55,65,1.8)}$ and the corresponding threshold τ are given in the last 3 penultimate columns. The last column shows the τ-efficiencies of the design ξ_u.

c0	c1	β0	β1	β2	d1	d2	d3	effD(ξu)	effD(ξ0)	τ	effτ(ξu)
0.9	10.5	0.55	65	1.8	0.0161	0.0535	0.1047	0.92	1	0.040	0.461
0.9	7.5	0.55	65	1.8	0.0160	0.0537	0.1050	0.92	0.99	0.028	0.431
0.9	13.5	0.55	65	1.8	0.0159	0.0532	0.1042	0.92	0.99	0.050	0.401
0.9	10.5	0.55	45	1.8	0.0167	0.0565	0.1092	0.91	0.99	0.059	0.372
0.9	10.5	0.55	85	1.8	0.0151	0.0509	0.0998	0.92	0.99	0.029	0.446
0.9	10.5	0.55	65	1.5	0.0091	0.0361	0.0827	0.72	0.82	0.007	0.110
0.9	10.5	0.55	65	2.1	0.0222	0.0665	0.1167	0.87	0.94	0.085	0.422