X1 | X2 | X3 | X4 | |
试验1 | 1 | 1 | 1 | 1 |
试验2 | 1 | 2 | 2 | 2 |
试验3 | 1 | 3 | 3 | 3 |
试验4 | 2 | 1 | 2 | 3 |
试验5 | 2 | 2 | 3 | 1 |
试验6 | 2 | 3 | 1 | 2 |
试验7 | 3 | 1 | 3 | 2 |
试验8 | 3 | 2 | 1 | 3 |
试验9 | 3 | 3 | 2 | 1 |