Table I.

Locally D-optimal designs {d₀ = 0, d₁, d₂, d₃; 1/4, 1/4, 1/4, 1/4}for the Hunt-Bowman model for different nominal values. The D- and τ-efficiencies of the design ξ_u are given, along with the D-efficiencies of ${\xi }_0={\xi }_D^{\ast }({\theta }^{(0)})$ where θ⁽⁰⁾ =(170, 0.04, 1.46, 40)^T.

c1	τ	β0	β1	d1	d2	d3	effD(ξu)	effD(ξ0)	effτ (ξu)
170	0.04	1.46	40	0.020	0.04	0.0991	0.80	1	0.346
170	0.03	1.46	40	0.015	0.0404	0.0926	0.61	0.93	0.583
170	0.05	1.46	40	0.025	0.05	0.1090	0.86	0.70	0.405
170	0.04	1.26	40	0.020	0.0454	0.0976	0.81	0.98	0.420
170	0.04	1.66	40	0.020	0.04	0.1026	0.77	0.99	0.279
170	0.04	1.46	30	0.020	0.04	0.1188	0.75	0.94	0.205
170	0.04	1.46	50	0.020	0.0483	0.0901	0.76	0.88	0.541