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. 2018 Apr 4;9:325. doi: 10.3389/fphys.2018.00325

Table 1.

Time-domain features employed for joint feature.

Feature	Expression	Description
f₁	$\frac{1}{L} \sum_{i = k - L + 1}^{k} y_{i}$	Mean of EEG signal within the sliding window
f₂	max{y_k−L+1, …, y_k}	Maximum of EEG signal within the sliding window
f₃	min{y_k−L+1, …, y_k}	Minimum of EEG signal within the sliding window
f₄	$\frac{1}{L} \sum_{i = k - L + 1}^{k} {(y_{i} - f_{1})}^{2}$	Variance of EEG signal within the sliding window
f₅	$\sqrt{\frac{1}{L} \sum_{i = k - L + 1}^{k} {(y_{i} - f_{1})}^{2}}$	Standard deviation of EEG signal within the sliding window