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roystgnr comments on [Link] Social interventions gone wrong - Less Wrong Discussion
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Seeing the phrase "randomized controlled trials" over and over was at least a nice start. Too much social policy debate seems to compare Group A with Policy A and Group B with Policy not-A as if "A vs not-A" wasn't merely one out of thousands of major economic and cultural difference between the two self-selected groups.
Agreed on RCTs being the gold standard, the top tier of the evidence hierarchy (other than reviews of multiple RCTs).
However, if you choose a biased (corrupted) indicator, all your perfect measurement methodology can only minimize additional biases. A top of the line flood-proof house that you erect on top of a swamp will still go down. (Substitute with weakest-link analogy of your choice.)