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feature-list.md

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Hand Crafted Features List

The table below presents an overview of the hand crafted features that have been curated as inputs for the Random Forest model. These features are extracted from the Euclidean norm of the triaxial accelerometer data, minus 1 to remove gravity.

Feature Name Description Units
Moment features
avg Mean g
std Standard deviation g
skew Skewness
kurt Kurtosis
Quantile Features
min Minimum g
q25 Lower quartile g
med Median g
q75 Upper quartile g
max Maximum g
Autocorrelation features
acf_1st_max Maximum autocorrelation
acf_1st_max_loc Location of 1st autocorrelation maximum s
acf_1st_min Minimum autocorrelation
acf_1st_min_loc Location of 1st autocorrelation minimum s
acf_zeros Number of autocorrelation zero-crossings
Spectral features
pentropy Signal's spectral entropy nats
power Signal's total power $g^2$/s
f1, f2, f3 1st, 2nd and 3rd dominant frequencies Hz
p1, p2, p3 Power spectral densities of respective dominant frequencies $g^2$/s
fft0, fft1, fft2, ... Power spectral density for frequencies 0Hz, 1Hz, 2Hz, ... $g^2$/s
Peak features
npeaks Number of peaks in the signal per second 1/s
peaks_avg_promin Average prominence of peaks g
peaks_min_promin Minimum prominence of peaks g
peaks_max_promin Maximum prominence of peaks g