A very, very impressive cluster randomized trial. Very hard to do! See thread for findings.https://twitter.com/Jabaluck/status/1433036923610742789 …
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Part that doesn't surprise me: people who will conflate what a randomized cluster trial measuring an ecological effect in a real life setting with a randomized *clinical* trial (where we control everything and don't deal with overdispersion and only measure individual benefits).
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I'll try to write longer eventually, but just wanted to put it here. Any discussion you trust should mention measuring ecological effects in real life, cluster trials, overdispersion, limits to controls, statistical power and difference with clinical trials. Glib tweets won't do.
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Also congratulations to the authors. I honestly did not think they could pull this off, but they did an incredible job despite all the hurdles: unavoidable ones for statistical power, funding, ethical limits (which they respected, of course), and, wow, implementation! Amazing.
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And public health folk don’t consult with experts in behavior/motivation
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That's why public health made its biggest gains when it was a branch of Civil Engineering.
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