Table 1.
Summary and description of the variables.
| Abbreviation | Variable name | Description |
|---|---|---|
| PCk | Principal components/eigenvectors | Contains the information about the marker movements that define the PMk |
| EVk | Eigenvalues | Absolute contribution of PMk to overall variance |
| PPk(t) | Principal positions | Time-series that quantifies the evolution of the posture with respect to PCk |
| PVk(t) | Principal velocities | Time-series that quantifies the velocity of the postural changes defined by PMk |
| PAk(t) | Principal accelerations | Time-series that quantifies the acceleration of the postural changes defined by PMk |
| rEVk | Relative eigenvalues | Relative contribution of PMk to overall variance |
| rVARk | Relative variances | Relative contribution of PMk to variance produced by trial. |
| rSTDk | Relative standard deviations | Relative contribution of PMk to movement of trial. |
| CUM_rEVk | Cumulative relative eigenvalues | Cumulative relative contribution of PMk to overall variance. |
| CUM_rVARk | Cumulative relative variances | Cumulative relative contribution of PMk to variance produced by trial. |
| CUM_rSTDk | Cumulative relative standard deviations | Cumulative relative contribution of PMk to movement in trial. |
| RVm | Residual variance | Unexplained variance after setting threshold of PM-order m. |
| Nk | number of PA zero crossings | Number of interventions of the control system with respect to the movement defined by PMk |
| σk | Standard deviation of times between zero crossings | Standard deviation of times between the interventions of the control system with respect to the movement defined by PMk |