How might policymakers make reasonable decisions when they have limited information? That's the question Northwestern University's Charles F. Manski explores in his new paper, "Vaccination With Partial Knowledge of External Effectiveness." The paper is published online by the Proceedings of the National Academy of Sciences (PNAS) at http://www.pnas.org/content/early/2010/02/05/0915009107.full.pdf+html...

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