About Me

I am Xinyu Zhang, a Postdoctoral Research Scholar in the Department of Statistics and Actuarial Science at The University of Iowa. I obtained my PhD from the Center for Statistical Science at Tsinghua University, where I was advised by Dr. Dong Li and Dr. Howell Tong. Currently, I’m working under the mentorship of Dr. Kung-Sik Chan.

My research interests include high-dimensional inference, change point detection, nonlinear time series analysis, frequency domain analysis, and bootstrap methods, as well as matrix and tensor data analysis. I also collaborate closely with scientists in the health sciences and have been working on projects involving brain data, lung radiology data, and more.

Beyond academics, I enjoy photography and traveling!

Education

• 2017/09 to 2022/06: PhD in Statistics, Tsinghua University.
• 2013/09 to 2017/07: B.S. in Statistics, Renmin University of China.
• 2013/09 to 2017/07: B.Ec. in Economic Statistics, Renmin University of China.

Publications

(* indicates corresponding author)

• Nadeem, S. A., Zhang, X., Nagpal P., Hoffman, E. A., Chan, K. S., Comellas, A. P., and Saha, P. K. (2024). Automated CT-based decoupling of the effects of airway narrowing and wall thinning on airway counts in chronic obstructive pulmonary disease. British Journal of Radiology. tqae211.
• Armstrong, M. K., Jain, S., Nuckols, V., Pewowaruk, R., Zhang, X., DuBose, L., Sodoma, M., Madero, B., Voss, M. W., and Pierce, G. L. (2024). The association of structural versus load-dependent large artery stiffness mechanisms with cerebrovascular damage and cortical atrophy in humans. GeroScience. 46, 5587–5597.
• Zhang, X. and Li, D. (2024). Smooth transition moving average models: Estimation, testing, and computation. Journal of Time Series Analysis. 45(3), 463-478.
• Zhang, X., Li, D. and Tong, H. (2024). On the least squares estimation of multiple-threshold-variable autoregressive models. Journal of Business and Economic Statistics. 42(1), 215-228.
• Nadeem, S. A., Zhang, X., Chan, K. S., Hoffman, E. A., Comellas, A. P., and Saha, P. K. (2023). New CT-based metrics of rib cage dynamics between inspiration and expiration reveal accelerated aging in COPD among smokers. In C29. MORE THAN MEETS THE EYE: ADVANCED LUNG IMAGING (pp. A4716-A4716). American Thoracic Society.
• Zhang, X. and Tong, H. (2022). Asymptotic theory of principal component analysis for time series data with cautionary comments. Journal of the Royal Statistical Society: Series A. 185(2), 543–565.

Manuscripts

• Zhang, X. and Chan, K. S. Spectral change point estimation for high dimensional time series by sparse tensor decomposition. arXiv:2305.10656. Under revision.
• Zhang, X. and Chan, K. S. Adaptive matrix change point detection: Leveraging structured mean shifts. arXiv:2401.17473. Under revision.
• Yu, C., Li, D., Zhang, X. *, and Tong, H. Two-way Threshold Matrix Autoregression. arXiv:2407.10272.
• Johnson, M., Eberle M., Hultman I., Zhang, X., Hing B., Filali Y., Jimenez A., Matkovich, M., Mitchell S., Miller J., Velamuri R., Adegboyo J., Chan, K. S., Srivastava S. and Hultman R. Peripheral CGRP engages brain-wide electrical network activity of migraine. bioRxiv 2024.11.14.622885.