| Encode variables | Real values | ||
X1 | X2 | X1 | X2 | |
Factorial trials | −1 | −1 | 58.66 | 68.78 |
| 1 | −1 | 76.34 | 68.78 |
| −1 | 1 | 58.66 | 111.22 |
| 1 | 1 | 76.34 | 111.22 |
Star trials | −1.41 | 0 | 55.00 | 90.00 |
| 1.41 | 0 | 80.00 | 90.00 |
| 0 | −1.41 | 67.50 | 60.00 |
| 0 | 1.41 | 67.50 | 120.00 |
Centre trials | 0 | 0 | 67.50 | 90.00 |
| 0 | 0 | 67.50 | 90.00 |
| 0 | 0 | 67.50 | 90.00 |
| 0 | 0 | 67.50 | 90.00 |
| 0 | 0 | 67.50 | 90.00 |