Fig. 1
From: Motif clustering and digital biomarker extraction for free-living physical activity analysis
Visualization of the mean activity function (\(\:\frac{1}{n}\sum\:_{i=1}^{n}\frac{1}{D}\sum\:_{d}{A}_{id}^{\left(k\right)}\left(t\right)\)) for each cluster representing different motifs identified by the elastic distance-based motif clustering algorithm in the NHANES study. The mean activity function of the triaxial accelerometer is presented in (A) the X-axis, (B) the Y-axis, (C) the Z-axis, and (D) the combined magnitude of activity, calculated as \(\:\sqrt{{x\left(t\right)}^{2}+{y\left(t\right)}^{2}+z{\left(t\right)}^{2}}\)