Table 5.
Performance of the classification rules based on single features and on the best subset of features
| Features | ACC | SEN | SPE | PPV | NPV | Classified as stress if |
|---|---|---|---|---|---|---|
| SD2 | 73% | 79% | 67% | 70% | 76% | SD2<0.0646 |
| D2 | 73% | 69% | 76% | 74% | 71% | D2<2.2533 |
| REC | 71% | 67% | 76% | 74% | 70% | REC>0.3791 |
| En(rchon) | 71% | 64% | 79% | 75% | 69% | En(rchon)<1.0530 |
| α1 | 71% | 57% | 86% | 80% | 67% | α1<1.2479 |
| ShEn | 68% | 64% | 71% | 69% | 67% | ShEn>3.3060 |
| lmean | 67% | 57% | 76% | 71% | 64% | lmean>13.2302 |
| En(0.2) | 64% | 62% | 67% | 65% | 64% | En(0.2)<1.0517 |
| lmax | 60% | 62% | 57% | 59% | 60% | lmax<250.6263 |
| En(rmax) | 58% | 64% | 52% | 57% | 59% | En(rmax)<1.1099 |
| DET | 56% | 69% | 43% | 55% | 58% | DET>0.9870 |
| α2 | 40% | 50% | 31% | 42% | 38% | α2<0.7711 |
| SD1 | 39% | 33% | 45% | 38% | 40% | SD1>0.0243 |
| SD1,SD2, En(0.2) | 90% | 86% | 95% | 95% | 87% | See formula 15 |