The study specifically controlled to find causationhttps://twitter.com/brobrahbrehbro/status/1142592617391120384 …
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The study followed individuals for over 20 years, testing their IQ at 13, and then in their 30s
Yes. But longitudinal studies by themselves cannot show causation. Bad study design + low power + no genetic controls + no randomization = no scientific value.
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There's a lot in the press about exercising improving health but is it possible for unhealthy people to exercise? Which is the proper causation?
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