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Megan McArdle

Revisiting Obamacare's Health Benefits

Jim Manzi and Tyler Cowen are skeptical that a new study validates the health benefits of Obamacare.
The Massachusetts results should make you revise your estimates; they should not make you throw out everything else you know. Photographer: Spencer Platt/Getty Images
The Massachusetts results should make you revise your estimates; they should not make you throw out everything else you know. Photographer: Spencer Platt/Getty Images

Jim Manzi , my favorite writer on randomized controlled trials, e-mails to dissent from my assessment of the Massachusetts study:

This is quite fair, and I think that many people read my post as expressing a more radical change in my thinking than I meant. Ultimately, I do prefer RCTs to observational studies, for the same reasons that we use RCTs, and not observational studies, to test new health-care treatments. The Massachusetts results should make you revise your estimates; it should not make you throw out everything else you know.