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Table 2 Summary of secondary features calculated on each sensor channel (primary feature)

From: Would a thermal sensor improve arm motion classification accuracy of a single wrist-mounted inertial device?

# 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