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| Error | ||||
| Covariance | Selected Features | SO | SI | Rank SI |
| None | 1, 5, 6, 7, 8 | 13.1% | 13.1% | 1 |
| Block 1 | 1, 5, 6, 7, 8 | 13.1% | 13.1% | 1 |
| Block 2 | 1, 5, 8, 9, 10 | 14.9% | 18.2% | 64 |
| Block 3 | 1, 5, 6, 7, 8 | 13.1% | 13.1% | 1 |
| Block 1∼2 | 1, 4, 5, 8, 9 | 6.1% | 14.0% | 143 |
| Block 1∼3 | 1, 5, 6, 7, 8 | 11.6% | 11.6% | 1 |
| Block 2∼3 | 1, 2, 3, 7, 8 | 2.2% | 3.5% | 18 |
