Table 1. Feature extracted from the RAW data.

Feature name	Definition
Mean	AVG(Σxi); AVG(Σyi); AVG(Σzi)
Mean-magnitude	$\text{AVG}(\sqrt{x_i^2+y_i^2+z_i^2})$
Magnitude-mean	$\sqrt{{\overline{x}}^2+{\overline{y}}^2+{\overline{z}}^2}$
Max, min, zero-cross	max, min, zero-cross
Variance	VAR(Σxi); VAR(Σyi); VAR(Σzi)
Correlation	$\mathit{\text{corr}}(x,y)=\frac{\mathit{\text{cov}}(x,y)}{{\sigma }_x,{\sigma }_y}$