289 citations · 554 across the 25 of their papers we have counts for
4 papers · 1 filter
Validation of gait characteristics extracted from raw accelerometry during walking against measures of physical function, mobility, fatigability, and fitness
Jacek K. Urbanek, Vadim Zipunnikov, Tamara Harris +3
Background. Wearable accelerometry devices allow collection of high-density activity data in large epidemiological studies both in-the-lab as well as in-the-wild (free-living). Suc…
Simple fixed-effects inference for complex functional models
So Young Park, Ana-Maria Staicu, Luo Xiao +1
We propose simple inferential approaches for the fixed effects in complex functional mixed effects models. We estimate the fixed effects under the independence of functional residu…
Stride variability measures derived from wrist- and hip-worn accelerometers
Jacek K. Urbanek, Jaroslaw Harezlak, Nancy W. Glynn +3
Many epidemiological and clinical studies use accelerometry to objectively measure physical activity using the activity counts, vector magnitude, or number of steps. These measures…
Fast Covariance Estimation for Sparse Functional Data
Luo Xiao, Cai Li, William Checkley +1
Smoothing of noisy sample covariances is an important component in functional data analysis. We propose a novel covariance smoothing method based on penalized splines and associate…