Table 2.
Comparison index performance of R2.
| Model | Comparison index of training set R2 | Comparison index of testing set R2 | ||||||
|---|---|---|---|---|---|---|---|---|
| Min | Max | Mean | Std | Min | Max | Mean | Std | |
| GA–SVR | 0.9882 | 0.9963 | 0.9916 | 0.0027 | 0.8235 | 0.8661 | 0.8488 | 0.0115 |
| SVR | 0.6958 | 0.6958 | 0.6958 | 0.0000 | 0.6899 | 0.6899 | 0.6899 | 0.0000 |
| BP | 0.3468 | 0.7106 | 0.5483 | 0.0967 | 0.3627 | 0.6050 | 0.5157 | 0.0631 |
| RF | 0.9238 | 0.9325 | 0.9283 | 0.0023 | 0.6655 | 0.6982 | 0.6882 | 0.0072 |
The optimal values of each evaluation index are in [bold].