A Confidence Region for Zero-Gradient Solutions for Robust Parameter Design Experiments

Table 1

Noise-variable-reduced models for simulations.

Model no.	k	h	Model form
1	3	2	𝑦=1+𝑥1+𝑥2+𝑥3+𝑥^21+𝑥^22+𝑥1×𝑥2+𝑧1+𝑥1×𝑧1+𝑥2×𝑧1+𝑧2−𝑥3×𝑧2+𝑒
2	4	2	𝑦=1+𝑥1+𝑥2+𝑥3+𝑥4+𝑥^21+𝑥^22+𝑥2×𝑥3+𝑧1+𝑥1×𝑧1+𝑥2×𝑧1+𝑧2−𝑥3×𝑧2+𝑥4×𝑧2+𝑒
3	4	3	𝑦=1+𝑥1+𝑥2+𝑥3+𝑥4+𝑥^21+𝑥^22+𝑥2×𝑥3+𝑧1+𝑥1×𝑧1+𝑥2×𝑧1+𝑧2+𝑥3×𝑧2+𝑧3+𝑥4×𝑧3+𝑒