Table 4.
Experimental design matrix.
| Experiment | I | x 1 | x 2 | x 3 | y |
|---|---|---|---|---|---|
| (1) | 1 | −1 | −1 | −1 | 0.013 |
| (2) | 1 | 1 | −1 | −1 | 0.030 |
| (3) | 1 | 1 | 1 | −1 | 0.031 |
| (4) | 1 | −1 | −1 | 1 | 0.014 |
| (5) | 1 | 1 | 1 | 1 | 0.038 |
| (6) | 1 | −1 | 1 | −1 | 0.015 |
| (7) | 1 | −1 | 1 | 1 | 0.026 |
| (8) | 1 | 1 | −1 | 1 | 0.033 |
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