| Subjects | Mean square error |
| 1 | 5.96E−04 |
| 2 | 3.00E−04 |
| 3 | 4.59E−04 |
| 4 | 4.19E−04 |
| 5 | 3.90E−04 |
| 6 | 4.25E−04 |
| 7 | 1.98E−04 |
| 8 | 2.75E−04 |
| 9 | 2.18E−04 |
| 10 | 1.59E−04 |
| 11 | 2.31E−04 |
| 12 | 1.85E−04 |
| 13 | 4.37E−04 |
| 14 | 3.95E−04 |
| 15 | 1.68E−04 |