Dr. Duan is a professor at UCLA Medical School, Department of Psychiatry of Biobehavioral Sciences, Center for Community Health and Biostatistics Core. He received his Ph.D. in statistics at Stanford University in 1979, and has worked since as a practicing statistician, primarily in health services research. He served as the project statistician on a number of large-scale field studies, including the RAND Health Insurance Experiment, lead by Joe Newhouse, a randomized trial of the effect of insurance coverage on medical care expenditures and patient outcomes; the HIV Costs and Service Utilization Study, led by Martin Shapiro and Sam Bozzette, a longitudinal survey based on a national probability sample of HIV+ persons in care; the Los Angeles Mammography Promotion in Churches Study, led by Sarah Fox, a group randomized trial that studies the promotion of mammography through religious organizations; and the Partners-in-Care study, led by Ken Wells, a randomized trial of the effect of quality improvement interventions on the quality of depression care in primary, managed-care settings. Through those practical research studies, he has made significant contributions to statistical methodologies that address practical questions arising from those field studies, including transformation models and retransformation, multi-part models for semi-continuous data, model robustness, etc.

He is an elected fellow in the American Statistical Association and the Institute of Mathematical Statistics. He served on the editorial board for a number of leading methodological journals, including Journal of American Statistical Association, Statistica Sinica, and Health Services and Outcomes Research Methodology. He has served on a number of national panels and committees, including National Academy of Sciences, Institute of Medicine, National Institute of Mental Health, and U.S. Environmental Protection Agency.

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