Dr. Pan's research work focuses on causal inference, advanced statistical modeling, meta-analysis, psychometrics, and their applications in the social, behavioral, and health sciences. He has been involved in many research projects funded by federal agencies such as NIH and NSF. He has published numerous referred journal articles on both methodological and applied research studies. His recent book entitled "Propensity Score Analysis: Fundamentals and Developments" tackles both methodological and practical issues in propensity score methods in observational studies.