Table 2.

Main Features of Shimmer3 IMU.

Features
Mean Absolute Value	$\frac{{\sum }_{i=1}^N\left|Ac{c}_i\right|}{N}$
Standard Deviation ($\sigma$)	$\sqrt{\frac{{\sum }_{i=1}^N{(Ac{c}_i-\mu )}^2}{N}}$ Where $\mu$ is mean of considered temporal window
Variance (VAR)	$\frac{{\sum }_{i=1}^N{(Ac{c}_i-\mu )}^2}{N}$ Where $\mu$ is mean of considered temporal window
Maximum	$max\left(Ac{c}_i\right)$
Minimum	$min\left(Ac{c}_i\right)$
Root Mean Square	$\sqrt{\frac{{\sum }_{i=1}^{N}Ac{c}_i^2}{N}}$
Simple Squared Integral	${\sum }_{i=1}^{N}Ac{c}_i^2$
Wavelet Entropy	$-{\sum }_{i=1}^{N}Ac{c}_i\ast ln\left(Ac{c}_i\right)$
Skewness	$\frac{{\sum }_{i=1}^N{(Ac{c}_i-\mu )}^3}{N\ast \sigma }$ Where $\mu$ is mean and $\sigma$ is the VAR of considered temporal window
Kurtosis	$\frac{{\sum }_{i=1}^N{(Ac{c}_i-\mu )}^4}{N\ast \sigma }$ Where $\mu$ is mean and $\sigma$ is the VAR of considered temporal window
Dynamic Acceleration Change	$max\left(Ac{c}_i\right)-min\left(Ac{c}_i\right)$
Static Acceleration Change	$max\left(FilteredAc{c}_i\right)-min\left(FilteredAc{c}_i\right)$
Log Energy Entropy	${\sum }_{i=1}^N{log}_2\left(Ac{c}_i\right)$