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Selected experiments for the D-optimal design.
| Experiment | X1 | X2 | X3 | X4 |
|---|---|---|---|---|
| 1 | 0 | 1 | − 1 | − 1 |
| 2 | − 1 | − 1 | 1 | − 1 |
| 3 | 1 | − 1 | 1 | − 1 |
| 4 | 0 | 0 | 1 | − 1 |
| 5 | − 1 | 1 | 1 | − 1 |
| 6 | 1 | 1 | 1 | − 1 |
| 7 | − 1 | − 1 | − 1 | 1 |
| 8 | 1 | − 1 | − 1 | 1 |
| 9 | 0 | 0 | − 1 | 1 |
| 10 | − 1 | 1 | − 1 | 1 |
| 11 | 1 | 1 | − 1 | 1 |
| 12 | − 1 | − 1 | 1 | 1 |
| 13 | 1 | − 1 | 1 | 1 |
| 14 | − 1 | 1 | 1 | 1 |
| 15 | 1 | 1 | 1 | 1 |
| 16 | 0 | − 1 | − 1 | − 1 |
| 16 replicate 2 | 0 | − 1 | − 1 | − 1 |
| 17 | − 1 | 0 | − 1 | − 1 |
| 17 replicate 2 | − 1 | 0 | − 1 | − 1 |
| 18 | 1 | 0 | − 1 | − 1 |
| 18 replicate 2 | 1 | 0 | − 1 | − 1 |
