| | Feature | Description |
| | Standard deviation | Standard deviations of (x, y, z, magnitude) from accelerometer, gyroscope signals, and EMG signal | Standard deviation
Auto-correlation | Auto-correlation of the standard deviations of (x, y, z, magnitude) from accelerometer, gyroscope signals, and EMG signal
Adopted function: statsmodels.tsa.stattools.acf (x, unbiased = false, nlags = 40, qstat = false, fft = none, alpha = none, missing = “none”) | Standard deviation
Auto-covariance | Auto-covariance of the standard deviations of (x, y, z, magnitude) from accelerometer, gyroscope signals and EMG signal
Adopted function: statsmodels.tsa.stattools.acv (x, unbiased = false, nlags = 40, qstat = false, fft = none, alpha = none, missing = “none”) | | Variance | Variance of (x, y, z, magnitude) from accelerometer, gyroscope signals, and EMG signal | | Mean | Mean of (x, y, z, magnitude) from accelerometer, gyroscope signals, and EMG signal | Mean
Auto-covariance | Auto-covariance of the mean values of (x, y, z, magnitude) from accelerometer, gyroscope signals, and EMG signal | Mean
Auto-correlation | Auto-correlation of the mean values of (x, y, z, magnitude) from accelerometer, gyroscope signals, and EMG signal | | Minimum | Minimum value of (x, y, z, magnitude) from accelerometer, gyroscope signals, and EMG signal | | Maximum | Maximum value of (x, y, z, magnitude) from accelerometer, gyroscope signals, and EMG signal | | Skewness | Asymmetry of (x, y, z, magnitude) from accelerometer, gyroscope signals, and EMG signal
Adopted function: scipy.stats.skew (a, axis = 0, bias = true) | | Kurtosis | Fourth central moment value divided by the variance square value of (x, y, z, magnitude) from accelerometer, gyroscope signals, and EMG signal
Adopted function: scipy.stats.skew (a, axis = 0, bias = true) | | Root-mean squared | Square root of the mean square (x, y, z, magnitude) from accelerometer, gyroscope signals, and EMG signal | | Mean crossing rate | Mean crossing rate of (x, y, z, magnitude) from accelerometer, gyroscope signals, and EMG signal | | Jitter | Jitter of (x, y, z, magnitude) from accelerometer, gyroscope signals, and EMG signal, where the jitter is defined as the deviation of a signal’s significant instants from their ideal positions in time |
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