Erjia Cui

Below are the main themes of my research work, along with key publications in each area.

Bayesian Functional Data Analysis

Tutorial on Bayesian Functional Regression Using Stan (2025) [link] [R package]
- Ziren Jiang, Ciprian M. Crainiceanu, and Erjia Cui
- Statistics in Medicine, 44(20-22), e70265.

Multilevel Functional Data Analysis

Fast Penalized Generalized Estimating Equations for Large Longitudinal Functional Datasets (2026) [link]
- Gabriel Loewinger, Alexander W. Levis, Erjia Cui, and Francisco Pereira
- Biometrics, 82(3), ujag106.
INTACT: A Method for Integration of Longitudinal Physical Activity Data from Multiple Sources (2026) [link] (with discussion)
- Jingru Zhang, Erjia Cui, Hongzhe Li, and Haochang Shou
- Biometrics, 82(2), ujag112.
A Case Study of Glucose Levels During Sleep Using Fast Function on Scalar Regression (2023) [link]
- Renat Sergazinov, Andrew Leroux, Erjia Cui, Ciprian M. Crainiceanu, R. Nisha Aurora, Naresh M. Punjabi, and Irina Gaynanova
- Biometrics, 79(4), 3873-3882.
Fast Multilevel Functional Principal Component Analysis (2023) [link] [R software]
- Erjia Cui, Ruonan Li, Ciprian M. Crainiceanu, and Luo Xiao
- Journal of Computational and Graphical Statistics, 32(2), 366-377.
Fixed-effects Inference and Tests of Correlation for Longitudinal Functional Data (2022) [link]
- Ruonan Li, Luo Xiao, Ekaterina Smirnova, Erjia Cui, Andrew Leroux, and Ciprian M. Crainiceanu
- Statistics in Medicine, 41(17), 3349-3364.
Fast Univariate Inference for Longitudinal Functional Models (2022) [link] [R package]
- Erjia Cui, Andrew Leroux, Ekaterina Smirnova, and Ciprian M. Crainiceanu
- Journal of Computational and Graphical Statistics, 31(1), 219-230.

Survival Analysis with Functional Predictors

Additive Functional Cox Model (2021) [link] [R software]
- Erjia Cui, Ciprian M. Crainiceanu, and Andrew Leroux
- Journal of Computational and Graphical Statistics, 30(3), 780-793.

Wearable Devices & Physical Activity

Association of Chronic Disease Risk and Physical Activity Measured by Wearable Devices in the All of US Program (2026) [link]
- Yu Hou, Erjia Cui, Kelvin Lim, Lisa S. Chow, Michael Howell, Sayeed Ikramuddin, and Rui Zhang
- Communications Medicine.
Moderate-to-Vigorous Physical Activity at any Dose Reduces All-Cause Dementia Risk Regardless of Frailty Status (2025) [link]
- Amal A. Wanigatunga, Yiwen Dong, Mu Jin, Andrew Leroux, Erjia Cui, Xinkai Zhou, Angela Zhao, Jennifer A. Schrack, Karen Bandeen-Roche, Jeremy D. Walston, Qian-Li Xue, Martin A. Lindquist, and Ciprian M. Crainiceanu
- Journal of the American Medical Association, 26(3), 105456.
Objectively Measured Physical Activity Using Wrist-worn Accelerometers as a Predictor of Incident Alzheimer's Disease in the UK Biobank (2025) [link]
- Angela Zhao, Erjia Cui, Andrew Leroux, Xinkai Zhou, John Muschelli, Martin A. Lindquist, and Ciprian M. Crainiceanu
- The Journals of Gerontology, Series A: Biological Sciences and Medical Sciences, 80(2), glae287.
NHANES 2011-2014: Objective Physical Activity is the Strongest Predictor of All-Cause Mortality (2024) [link] (featured article)
- Andrew Leroux*, Erjia Cui*, Ekaterina Smirnova, John Muschelli, Jennifer A. Schrack, and Ciprian M. Crainiceanu
- Medicine & Science in Sports & Exercise, 56(10), 1926-1934.
Gender Difference in "Second-Shift" Physical Activity: New Insights from Analyzing Accelerometry Data in a Nationally Representative Sample (2023) [link]
- Wenxuan Huang, Lingxin Hao, Xingyun Wu, Xiao Yu, Erjia Cui, and Andrew Leroux
- SSM - Population Health, 24, 101536.
Evaluating the Prediction Performance of Objective Physical Activity Measures for Incident Parkinson's Disease in the UK Biobank (2023) [link]
- Angela Zhao, Erjia Cui, Andrew Leroux, Martin A. Lindquist, and Ciprian M. Crainiceanu
- Journal of Neurology, 270, 5913-5923.
Quantifying the Association Between Objectively Measured Physical Activity and Multiple Sclerosis in the UK Biobank (2023) [link]
- Qier Meng*, Erjia Cui*, Andrew Leroux, Ellen M. Mowry, Martin A. Lindquist, and Ciprian M. Crainiceanu
- Medicine & Science in Sports & Exercise, 55(12), 2194-2202.

Amyotrophic Lateral Sclerosis

Risk Prediction for ALS Using Semi-competing Risk Models with Applications to ALS Natural History Consortium Dataset (2025) [link]
- Andres Arguedas, David Schneck, Erjia Cui, Annette Xenoloupos-Oddsson, David Walk, Mark Fiecas, and ALS NHC Investigators
- Amyotrophic Lateral Sclerosis and Frontotemporal Degeneration, 26(5-6), 550-557.

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