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. 2021 Mar 22;8(21):16035–16046. doi: 10.1109/JIOT.2021.3067605

TABLE III. Functionals Applied to LLDs in the ComParE Feature Set. Note That Some Functionals of This Table May or May Not be Used to All of the LLDs Listed in Table II. Details Can be Found in [55].

Functionals
Temporal centroid
Peak mean value and distance to arithmetic mean
Mean and standard deviation of peak to peak distances
Peak and valley range (absolute and relative)
Peak-valley-peak slopes mean and standard deviation
Segment length mean, minimum, maximum, standard deviation
Up-level time 25%, 50%, 75%, 90%
Rise time, left curvature time
Linear prediction gain and coefficients 1–5
Arithmetic or positive arithmetic mean
Root-quadratic mean, flatness
Standard deviation, skewness, kurtosis, quartiles 1–3
Inter-quartile ranges 1–2, 2–3, 1–3,
99-th and 1-st percentile, range of these
Relative position of maximum and minimum value
Range (difference between maximum and minimum values)
Linear regression slope, offset
Linear regression quadratic error
Quadratic regression coefficients
Quadratic regression quadratic error