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Coefficient of determination (R2) for the performance evaluation of regression models.
| Task | Random forest, R2 (SD) | Support vector machine, R2 (SD) | Gradient boosting, R2 (SD) | k-nearest neighbors, R2 (SD) |
| Tap | 0.610 (0.024) | 0.693 (0.039) | 0.675 (0.031)) | 0.650 (0.099) |
| Flick | 0.567 (0.028) | 0.644 (0.042) | 0.634 (0.030) | 0.625 (0.106) |
| Drag | 0.570 (0.033) | 0.659 (0.025) | 0.648 (0.046) | 0.634 (0.012) |
| All | 0.638 (0.026) | 0.802 (0.036) | 0.731 (0.042) | 0.706 (0.095) |
