Qingwen Zhang | Department of Mathematics, National University of Singapore

About Me

I am a Research Fellow in the Department of Mathematics at the National University of Singapore, under the supervision of Prof. Vincent Y. F. Tan. I received my Ph.D. from the Hong Kong University of Science and Technology, where I was co-supervised by Prof. Wenjia Wang and Prof. Yuan Yao.

Research Interests

Sequential Decision-Making
Offline Reinforcement Learning
Nonparametric Statistics
High-Dimensional Inference

Academic Positions

Research Fellow, Department of Mathematics, National University of Singapore, Aug. 2026–Present
Research Fellow, Department of Industrial Systems Engineering & Management, National University of Singapore, Jan. 2026–Aug. 2026

Publications and Preprints

Sobolev Calibration of Imperfect Computer Models

Qingwen Zhang, Wenjia Wang

Journal of the American Statistical Association, 120(549), 408–418, 2025.

Article
SPARKLE: A Nonparametric Approach for Online Decision-Making with High-Dimensional Covariates

Wenjia Wang^*, Qingwen Zhang^*#, Xiaowei Zhang^*

Manuscript under review, 2026.

arXiv
Attack-Resistant Uniform Fairness: Near-Optimal Algorithms for Linear and Smooth Contextual Bandits

Qingwen Zhang, Wenjia Wang

Manuscript under review, 2026.

arXiv
High-Dimensional Data Integrative Analysis and Subgroup Identification Incorporating Data Source Network Structure

Kuangnan Fang, Qingwen Zhang, Hongwei Lin

Statistical Research, 39(7), 125–136, 2022. (In Chinese)

Article

^* Equal contribution; ^# Corresponding author.

Teaching and Professional Activities

Oral Presentation, 14th POMS-HK Conference, 2024
Teaching Assistant, Empirical Process, Fall 2022
Teaching Assistant, Honors Calculus I, Fall 2023

Honors and Awards

Outstanding Master’s Thesis in Fujian Province, 2022
Best Paper Award, Wang Yanan Institute for Studies in Economics, 2021
Horizon Scholarship, 2020
National Scholarship, 2019