Method | No selection | Channel groups | Feature groups | ||
---|---|---|---|---|---|
 |  | Forward | Backward | Forward | Backward |
RF: number of features | 41 × 29 = 1189 | 4 × 29 = 116 | 35 × 29 = 1015 | 41 × 2 = 82 | 41 × 28 = 1148 |
RF: error rate | 0.08 | 0.10 | 0.07 | 0.09 | 0.08 |
SVM: number of features | 41 × 29 = 1189 | 5 × 29 = 145 | 23 × 29 = 667 | 41 × 2 = 82 | 41 × 9 = 369 |
SVM: error rate | 0.07 | 0.10 | 0.07 | 0.09 | 0.07 |