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Response surface test design and results of first group.
| No. | X1 | X2 | X3 | Y1 (%) |
|---|---|---|---|---|
| 1 | − 1 | − 1 | − 1 | 13.21 |
| 2 | 0 | − 1 | − 1 | 8.54 |
| 3 | 1 | − 1 | − 1 | 7.49 |
| 4 | − 1 | − 1 | 0 | 11.58 |
| 5 | 0 | − 1 | 0 | 11.02 |
| 6 | 1 | − 1 | 0 | 9.41 |
| 7 | 0 | − 1 | 1 | 10.88 |
| 8 | 1 | − 1 | 1 | 9.74 |
| 9 | − 1 | 0 | − 1 | 10.48 |
| 10 | 0 | 0 | − 1 | 8.53 |
| 11 | 1 | 0 | − 1 | 7.35 |
| 12 | − 1 | 0 | 0 | 11.87 |
| 13 | 0 | 0 | 0 | 10.96 |
| 14 | 1 | 0 | 0 | 9.83 |
| 15 | 0 | 0 | 1 | 8.79 |
| 16 | 1 | 0 | 1 | 8.37 |
| 17 | − 1 | 1 | − 1 | 8.52 |
