Correlation and causation (via xkcd)

Austin Frakt, PhD, is co-Editor-in-Chief of The Incidental Economist. His day job is Associate Director of the Partnered Evidence-based Policy Resource Center at the Boston VA Healthcare System, U.S. Department of Veterans Affairs. He is also a Principal Research Scientist with the Department of Health Policy and Management at the Harvard T.H. Chan School of Public Health, and Editor-in-Chief of the journal Health Services Research.