Medicare currently allows beneficiaries to choose between a government-run health plan and a privately- administered program known as Medicare Advantage (MA). Because enrollment in MA is optional, conventional observational estimates of the program's impact are potentially subject to selection...

Conventional outcomes report cards-- public disclosure of information about the patient-background-adjusted health outcomes of individual hospitals and physicians -- may help improve quality, but they may also encourage providers to "game" the system by avoiding sick and/or seeking healthy...