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Tuesday, June 3, 2014
3:30 pm to 4:50 pm
Health Sciences K-069

"Difference-in-Difference Approach in Epidemiologic Research"




Ali Rowhani-Rahbar, MD, MPH, PhD

Assistant Professor, Epidemiology


The Difference-in-Difference (DiD) estimation is a popular approach in social sciences to examine the effect of interventions or policy changes on a variety of metrics especially those used in econometrics.  This seminar is devoted to a discussion of DiD approach and its applications in contemporary epidemiologic research.  Examples from epidemiology literature in different subdisciplines including vaccine and drug pharmacoepidemiology, injury epidemiology, infectious disease epidemiology, and psychiatric epidemiology along with their strengths and limitations, and “best practices” for the use of this approach in health sciences research, will be discussed.   

About the Speaker:

Dr. Rowhani-Rahbar has been a member of the faculty in the Department of Epidemiology since 2012. Prior to joining the University of Washington, he served as a postdoctoral scholar in the Department of Pediatrics at Stanford University, and subsequently completed a CDC-sponsored national Vaccine Safety Research Fellowship program during which he studied the epidemiology of adverse events following immunization.  The main goals of his research are to: (1) evaluate vaccine safety, effectiveness, and utilization; and (2) generate epidemiologic evidence with translational potential for the development of interventions designed to prevent injury and improve its outcomes.  His methodologic work involves the assessment of acute events following transient exposures using self-controlled designs.    

Suggested Readings:

The impact of Iraq War on neonatal polio immunisation coverage: a quasi-experimental study, Cetorelli V.,J Epidemiol Community Health, 2013;0:1–6. doi:10.1136/jech-2013-203174

Age, Antipsychotics, and the Risk of Ischemic Stroke in the Veterans Health Administration,Wang S1, Linkletter C, Dore D, Mor V, Buka S, Maclure M.Stroke. 2012 Jan;43(1):28-31. doi: 10.1161/STROKEAHA.111.617191. Epub 2011 Oct 27.


Updated on April 22, 2014