dclayh comments on Experts vs. parents - Less Wrong
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As a statistical aside, I see no strong reason to believe a meta-analysis should be any more convincing than a single, large, well-designed study. In fact, by mixing the results of rigorous studies in with the unrigorous ones, you're probably just diluting the signal to noise ratio.
Does anyone claim it is? I thought the advantage of a meta-analysis was the cost savings of not having to do a new, large study.