Table 2 Features employed in this study
Domain | Name of the features | Number of features |
|---|---|---|
Time based | Average, maximum, standard deviation, minimum, variance, CoV, skewness, kurtosis, RMS | 9 |
Entropy based | Hjorth mobility, Hjorth complexity, mean of lower envelop, mean of upper envelop, mean diff operator, Higuchi fractal dimension, Higuchi algorithmic entropy, renyi entropy, shannon entropy, Tsallis entropy, Hurst exponential, approximate entropy, sample entropy | 13 |
Frequency based | Spectral flatness, spectral flux, spectral entropy, spectral edge frequency (SEF) 80, spectral edge power (SEF) 80, spectral edge frequency (SEF) 90, spectral edge power (SEF) 90, spectral edge frequency (SEF) 95, spectral edge power (SEF) 95 | 9 |
Time–frequency | Symlet 4 wavelet family and decomposition level:3. Entropy (e), variance(V), standard deviation, median (s), average, ration of maximum and min of 4 decomposing s vector’s. Percentage of energy corresponding to the approximation, percentage of energy corresponding to the details | 26 |
– | – | Total 57 |