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Overcoming Bias Commenter's avatar

There is some criticism of the Rand study here (http://www.marginalrevoluti..., basically arguing that those participants with significant health costs were more likely to leave the study to regain full coverage, thus skewing the results. If that criticism is correct, the entire premise of the argument collapses.

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Overcoming Bias Commenter's avatar

Floccina, they asked 60% of their subjects how much they exercised, at the start of their participation in the study. Then they asked all of them how much they exercised at the end of the study. They folded this information into a bigger combined variable. They found that having 50% more visits to doctors and 50% more hospitalisations didn't have much effect on the bigger health variable.

It makes sense that wouldn't have much effect on how much exercise people said they did, doesn't it?

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