Table 5.
The 23 features selected by sequential forwarding selection for support vector classifier. K indicates an iteration number in feature selection.
| K | Accumulated features | F1 |
|---|---|---|
| 1 | Audio amplitude (24H) | 0.657 |
| 2 | Audio amplitude (6PM-0AM) | 0.655 |
| 3 | Variability of time spent at “religious” location | 0.642 |
| 4 | Distance travelled (24H) | 0.668 |
| 5 | Variability of activity “walking” duration (6PM-0AM) | 0.680 |
| 6 | Number of place visited (6PM-0AM) | 0.710 |
| 7 | Variability of activity “still” duration (6PM-0AM) | 0.775 |
| 8 | Variability of number of place visited (24H) | 0.698 |
| 9 | Variability of audio amplitude (24H) | 0.718 |
| 10 | Number of unlock (0–9AM) | 0.719 |
| 11 | Regularity of time spent at “religious” location | 0.727 |
| 12 | Variability of audio amplitude (0–9AM) | 0.719 |
| 13 | Regularity of activity “running” duration (0–9AM) | 0.746 |
| 14 | Activity “still” duration (6PM-0AM) | 0.743 |
| 15 | Time spent at “religious” location | 0.747 |
| 16 | Variability of conversation duration (24H) | 0.762 |
| 17 | Distance travelled (0–9AM) | 0.789 |
| 18 | Variability of distance travelled (24H) | 0.777 |
| 19 | Activity “walking” duration (24H) | 0.772 |
| 20 | Regularity of time spent at “greek” location | 0.759 |
| 21 | Conversation duration (0–9AM) | 0.766 |
| 22 | Variability of number of unlock (6PM-0AM) | 0.764 |
| 23 | Regularity of number of unlock (6PM-0AM) | 0.793 |