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Selene Yue Xu
University of California, San Diego
2Publications
1H-index
1Citations
Publications 2
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#1Selene Yue Xu (UCSD: University of California, San Diego)H-Index: 1
#2Sandahl H. Nelson (SDSU: San Diego State University)H-Index: 6
Last.Loki Natarajan (UCSD: University of California, San Diego)H-Index: 49
view all 10 authors...
Accelerometers are person-worn sensors that provide objective measurements of movement based on minute-level activity counts, thus providing a rich framework for assessing physical activity patterns. New statistical approaches and computational tools are needed to exploit these densely sampled time-series data. We implement a functional principal component mixed model approach to ascertain temporal activity patterns in 578 overweight women (60% cancer survivors) and summarize individual patterns...
#1Selene Yue Xu (UCSD: University of California, San Diego)H-Index: 1
#2Sandahl H. Nelson (SDSU: San Diego State University)H-Index: 6
Last.Loki Natarajan (UCSD: University of California, San Diego)H-Index: 49
view all 9 authors...
Physical inactivity is a recognized risk factor for many chronic diseases. Accelerometers are increasingly used as an objective means to measure daily physical activity. One challenge in using these devices is missing data due to device nonwear. We used a well-characterized cohort of 333 overweight postmenopausal breast cancer survivors to examine missing data patterns of accelerometer outputs over the day. Based on these observed missingness patterns, we created psuedo-simulated datasets with r...
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