Table 2.
Extracted features representing bradykinesia and tremor symptoms. The features that represent both symptoms are shown in separate rows. All the features were extracted from the time domain except for the shaded features that were extracted from the spectral domain. All the features except for the cross correlation features were extracted from each X, Y, and Z signal separately resulting in three extracted features. The number of extracted features are provided in the last column.
| Symptom | Features | # |
|---|---|---|
| Bradykinesia | Average Jerk | 3 |
| Peak-Peak Amplitude | 3 | |
| Mean Amplitude | 3 | |
| SD Amplitude | 3 | |
| Skewness | 3 | |
| Kurtosis | 3 | |
| Sample Entropy | 3 | |
| Shannon Entropy | 3 | |
| Gini Index | 3 | |
| 1–4 Hz Signal Power | 3 | |
| Tremor | First Autocorrelation Peak Amplitude | 3 |
| First Autocorrelation Peak Lag | 3 | |
| Cross Correlation XY | 1 | |
| Cross Correlation XZ | 1 | |
| Cross Correlation YZ | 1 | |
| 4–6 Hz Signal Power | 3 | |
| Percentage Peak Frequencies >4 Hz | 3 | |
| Second Spectral Peak Frequency | 3 | |
| Second Spectral Peak Power | 3 | |
| Bradykinesia & Tremor | Autocorrelation Sum | 3 |
| 0.5–15 Hz Signal Power | 3 | |
| Spectral Entropy | 3 | |
| First Spectral Peak Frequency | 3 | |
| First Spectral Peak Power | 3 | |
| Number of Extracted Symptom-Based Features | 66 | |