Table 2.

List of extracted features.

Domain	Features	Expression
Statistical	RMS	$z_{rms}=\sqrt{\frac{1}{n}{\sum }_{i=1}^n{z}_i^2}$
	Variance	$z_{var}=\frac{1}{n}{\sum }_{i=1}^n{(z_i-\overline{z})}^2$
	Maximum	$z_{max}=max\left(z\right)$
	Skewness	$z_{skew}=E[{(\frac{z-\mu }{\sigma })}^3]$
	Kurtosis	$z_{kurt}=E[{(\frac{z-\mu }{\sigma })}^4]$
	Peak-to-Peak	$z_{p-p}=max\left(z\right)-min\left(z\right)$
Frequency	Spectral Skewness	$f_{skew}={\sum }_{i=1}k{(\frac{f_i-\overline{f}}{\sigma })}^{3}S\left(f_i\right)$
	Spectral Kurtosis	$f_{kurt}={\sum }_{i=1}k{(\frac{f_i-\overline{f}}{\sigma })}^{4}S\left(f_i\right)$
Time-Frequency	Wavelet Energy	$E_{WT}={\sum }_{i=1}^{N}w{t}_{\varphi }^2\left(i\right)/N$