Measure | Validity | Sensitivity | Reliability | Practicality | ||
---|---|---|---|---|---|---|
D | M1 | M2 | Measurement noise | |||
Root mean square jerk | × | - | - | - | - | ✓ |
Normalized mean absolute jerk | × | - | - | - | - | ✓ |
Dimensionless jerk | ✓ | ✓ | ✓ | × | × | ✓ |
Log dimensionless jerk | ✓ | ✓ | ✓ | ✓ | × | ✓ |
No. of peaks | ✓ | ✓ | ✓ | × | × | ✓ |
Speed arc length | ✓ | ✓ | ✓ | ✓ | × | ✓ |
Spectral arc length | ||||||
(SAL introduced in [4]) | × | ✓ | ✓ | ✓ | ✓ | ✓ |
Spectral arc length | ||||||
(SPARC introduced in this paper) | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |