Table 2.

The list of features extracted for amount estimation.

Features	Description
$f_1$–$f_{11}$	Mean of $a_x$, $a_y$, $a_z$, ${\omega }_x$, ${\omega }_y$, ${\omega }_z$, $a_{norm}$, ${\omega }_{norm}$, $a_{norm,xy}$, $a_{norm,yz}$, $a_{norm,xz}$
$f_{12}$–$f_{22}$	Standard deviation of $a_x$, $a_y$, $a_z$, ${\omega }_x$, ${\omega }_y$, ${\omega }_z$, $a_{norm}$, ${\omega }_{norm}$, $a_{norm,xy}$, $a_{norm,yz}$, $a_{norm,xz}$
$f_{23}$–$f_{33}$	Variance of $a_x$, $a_y$, $a_z$, ${\omega }_x$, ${\omega }_y$, ${\omega }_z$, $a_{norm}$, ${\omega }_{norm}$, $a_{norm,xy}$, $a_{norm,yz}$, $a_{norm,xz}$
$f_{34}$–$f_{44}$	Maximum of $a_x$, $a_y$, $a_z$, ${\omega }_x$, ${\omega }_y$, ${\omega }_z$, $a_{norm}$, ${\omega }_{norm}$, $a_{norm,xy}$, $a_{norm,yz}$, $a_{norm,xz}$
$f_{45}$–$f_{55}$	Minimum of $a_x$, $a_y$, $a_z$, ${\omega }_x$, ${\omega }_y$, ${\omega }_z$, $a_{norm}$, ${\omega }_{norm}$, $a_{norm,xy}$, $a_{norm,yz}$, $a_{norm,xz}$
$f_{56}$–$f_{66}$	Range of $a_x$, $a_y$, $a_z$, ${\omega }_x$, ${\omega }_y$, ${\omega }_z$, $a_{norm}$, ${\omega }_{norm}$, $a_{norm,xy}$, $a_{norm,yz}$, $a_{norm,xz}$
$f_{67}$–$f_{77}$	Kurtosis of$a_x$, $a_y$, $a_z$, ${\omega }_x$, ${\omega }_y$, ${\omega }_z$, $a_{norm}$, ${\omega }_{norm}$, $a_{norm,xy}$, $a_{norm,yz}$, $a_{norm,xz}$
$f_{78}$–$f_{88}$	Skewness of $a_x$, $a_y$, $a_z$, ${\omega }_x$, ${\omega }_y$, ${\omega }_z$, $a_{norm}$, ${\omega }_{norm}$, $a_{norm,xy}$, $a_{norm,yz}$, $a_{norm,xz}$
$f_{89}$	Duration of the sip gesture