Ph.D. Economics, McMaster University, Canada  2011
Ph.D. Dissertation: Essays in Health  Economics and Robust Econometrics
M.A. Economics, University of Guelph,  Canada 2005

Master's Thesis: A Comparison between Flexible  Parametric and Kernel Estimators B.Sc. Mathematics and Applied Mathematics,  Hebei Normal University, China 2004

1. COVID-19 and health inequality: Evidence from risky behaviors, (with C. Huang, F. Liu, S. Wei, and R.Xu), 2025, Journal of Comparative Economics,  https://doi.org/10.1016/j.jce.2025.06.001.

2. Vaccination and risky behaviors: evidence from the hepatitis B vaccination campaign in China, (with C. Huang, F. Liu, and R.Xu), 2023, Journal of Population Economics, Vol. 36, Pages 2549–2580.

3. Optimal model averaging of varying coefficient models (with Q. Li, J.Racine, and D. Zhang), 2018, Statistica Sinica, Vol. 28, Pages 2795-2809

4. Cross-validated mixed-datatype bandwidth selection for nonparametric cumulative distribution/survivor functions (with H. Li and J. Racine), 2017, Econometric Reviews, doi: 10.1080/07474938.2017.1307900.

5. Gradient-based bandwidth selection for estimating average derivatives(with Y. Wang), 2016, Economics letters, Vol. 140, Pages 19-22.

6. Binary response correlated random coefficient panel data models (with Y. Gao and Z. Liang), 2015, Journal of Econometrics, Vol. 188, Issue 2, Pages 421-434.

7. Asymptotics for nonparametric and semiparametric fixed effects panel models (with Z. Liang), 2015, Journal of Econometrics, Vol. 185, Issue 2, Pages 420-434.

8. A smooth nonparametric conditional density test for categorical responses (with J. Racine), 2013, Econometric Theory, Vol. 29, Pages 629-641.