Table 3. Performance of the integrated training sets under the four rules.
| Testing sets | Training sets | P-values |
| ECO | STY, PAU, BSU, CCS | 0.0080 |
| STY | ECO, PAU, BSU, FTN | 0.0037 |
| HIN | STY, PAU, SPO, SAO | 0.0024 |
| VCH | ECO, PAU, SPO, FTN | 0.0014 |
| PAU | VCH, CCS, ECO, FTN | 0.0011 |
| ACI | PAU, SSA, ECO, CCS | 0.0003 |
| FTN | VCH, PAU, ECO, BTH | 0.0048 |
| HPY | PAU, STY, ECO, VCH | 0.0013 |
| CCS | PAU, FTN, ECO, BTH | 0.0035 |
| BSU | SAO, SPN, ECO, CCS | 0.0022 |
| SAO | SPN, BSU, SCE, ECO | 0.0402 |
| SPN | SAO, HIN, ECO, SSA | 0.0095 |
| SSA | SAO, ACI, ECO, FTN | 0.0247 |
| MGE | MPU, SAO, ECO, HIN | 0.0017 |
| MPU | MGE, SAO, ECO, FTN | 0.0063 |
| MTU | SAO, HIN, ECO, CCS | 0.0034 |
| BTH | PGN, HIN, SCE, FTN | 0.0020 |
| PGN | BTH, PAU, ECO, SAO | 0.0030 |
| SCE | SPO, MGE, ECO, HPY | 0.0012 |
| SPO | SCE, MGE, ECO, HPY | 0.0147 |
Note: The first column indicates the species used as the testing set. The second column indicates the training sets selected according to the four criteria.