Jiaxin Qiu (邱佳鑫)
😀 About Me
Hi! 👋 I am currently a Postdoctoral Fellow in the Department of Mathematics at the University of Hong Kong, where I am mentored by Zhigang Bao.
🧐 Research Interests
- Random Matrix Theory
- High-dimensional Statistics
🏫 Education
- Ph.D. in Statistics, The University of Hong Kong, 2020 - 2024
- Supervisors: Jianfeng (Jeff) Yao (CUHK-SZ) and Zeng Li (SUSTech)
- M.Sc. in Statistics, Harbin Institute of Technology, 2018 - 2020
- Supervisor: Guoliang Tian
- B.Sc. in Mathematics, Southern University of Science and Technology, 2014 - 2018
📝 Publications & Preprints
[* = corresponding author, † = equal contribution, α-β = alphabetical order]
[The preprints on this website may be more up-to-date than their arXiv versions.]
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Spike Estimation from Heteroscedastic Noise via Random Splitting.
(α-β) Zhigang Bao, Kha Man Cheong, Yuji Li, Jiaxin Qiu (2026). Submitted.
arXiv
PDF
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A spectral approach for online covariance change point detection.
(α-β) Zhigang Bao, Kha Man Cheong, Yuji Li, Jiaxin Qiu (2026). Submitted.
arXiv
PDF
Code
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On eigenvalues of sample covariance matrices based on high-dimensional compositional data.
Qianqian Jiang†, Jiaxin Qiu†, Zeng Li* (2023). Submitted.
arXiv
PDF
Code
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On spiked eigenvalues of general sample covariance matrices under extreme aspect ratio.
Jiaxin Qiu, Zeng Li*, Jianfeng Yao (2026). Manuscript. -
Robust estimation for number of factors in high dimensional factor modeling via Spearman correlation matrix.
Jiaxin Qiu, Zeng Li*, Jianfeng Yao (2025). Journal of the American Statistical Association, 120:550, 1139-1151.
Link
PDF
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On singular values of large dimensional lag-tau sample auto-correlation matrices.
Zhanting Long, Zeng Li*, Ruitao Lin, Jiaxin Qiu (2023). Journal of Multivariate Analysis, 197.
Link
PDF
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Asymptotic normality for eigenvalue statistics of a general sample covariance matrix when $ p/n\to\infty $ and applications.
Jiaxin Qiu, Zeng Li*, Jianfeng Yao (2023). The Annals of Statistics, 51(3): 1427-1451.
Link
PDF
🤝 Academic Services
- Journal Reviewer for: Annals of Statistics, Biometrics, Communications in Statistics — Theory and Methods
😴 Teaching Assistant
- @HKU
- STAT6010/7610: Advanced Probability (Fall 2023)
- STAT2601: Probability and Statistics (Spring 2021, Spring 2024)
- @SUSTech
- STA5001: High Dimensional Statistics (Spring 2022, Spring 2023)
- MA308: Statistical Computation and Software (Fall 2020)
- MAT7102/MA412: Selected Research Topics in Statistics (Spring 2020)
- MA103A: Linear Algebra A (Fall 2018, Fall 2019)
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