A Mobile Application for Easy Design and Testing of Algorithms to Monitor Physical Activity in the Workplace

Table 4

Common features used in HAR systems classified by domain.

Type	Feature
Time and statistical	Mean, median, maximum, minimum, variance, standard deviation, cross-correlation, Root Mean Square (RMS), Signal Magnitude Area (SMA), Median Absolute Deviation (MAD), Time Between Peaks (TBP), max-delta between axis, skewness, kurtosis, displacement
Frequency	Discrete Fourier Transform (DFT), Discrete Cosine Transform (DCT), energy, max-coefficient, mean-frequency, skewness, kurtosis, Interquartile Range (IRQ)
Structural	Autoregressive (AR)
Transient	Trend, Magnitude Of Change (MOC)