Table 2 Summary of secondary features calculated on each sensor channel (primary feature)
# | Secondary feature | Calculation notes |
|---|---|---|
1 | Mean | Mean value of each channel for a single motion |
2 | Standard deviation | Standard deviation of each channel |
3 | Duration | Number continuous samples above 20th percentile value for the motion |
4 | Energy | Squared sum of the data sequence |
5 | Dominant frequency power | The peak power of the Power Spectral Density (PSD), calculated with periodogram function in Matlab |
6 | Dominant frequency | The peak frequency of PSD |
7 | Mean power | Average power of PSD |