. 2022 Nov 11;22(22):8733. doi: 10.3390/s22228733

Table 2.

Feature additions of the ASF-14NP stroke-oriented multidomain feature set.

Domain	Feature	Internal Parameters	Short Description
Time domain	LRMSV2-3	$γ = 2, 3$	$LRMSV γ = l o g {(\frac{1}{N} \sum_{n = 1}^{N} x_{n}^{γ})}^{\frac{1}{γ}}$ ;
	ASM	$e x p = \{\begin{matrix} 0.5, i f (n \geq 0.25 N a n d n \leq 0.75) \\ 0.75, o t h e r w i s e \end{matrix}$ ;	$ASM = \|\frac{\sum_{n = 1}^{N} {(x_{n})}^{e}}{N}\|$ ;
	ASR		$ASR = \|\sum_{n = 1}^{N} {(x_{n})}^{\frac{1}{2}}\|$ ;
	AAC		$AAC = \frac{1}{N} \sum_{n = 1}^{N - 1} \|x_{n + 1} - x_{n}\|$ ;
	HPC	$A c t i v i t y = \frac{1}{N} \sum_{n = 0}^{N - 1} {(x_{n} - \bar{x})}^{2}$ $, M o b i l i t y = \sqrt{\frac{A c t i v i t y (d n / d t)}{A c t i v i t y}}$ ;	$HPC = \sqrt{\frac{M o b i l i t y (d n ∕ d t)}{M o b i l i t y}}$ ;
Frequency domain	MMDF		$MMDF = \frac{1}{2} \sum_{j = 1}^{M} A_{j}$ ;
Frequency domain	SMD		$SMD = \frac{1}{2} \sum_{n = 1}^{M} P S D_{n}$ ;
Spatial domain	FER-4	The normalized mean value of the ratio between flexors and extensors channels.

$A_{j}$ represents the signal’s amplitude spectrum in a certain bin socket j, M is the frequency bin length (MMDF), and PSD is power spectral density of the signal (SMD).