So what’s your argument here? That places where people where masks systematically do less testing? What’s the purported confounding mechanism?
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My whole thing is examining how well we can actually estimate these things in any meaningful sense. In COVID in particular, everything gets much, much harder to the point of near-hopelessness for many questions. I think we all need to get much more comfortable with that.
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Identifying and estimating causal effects is extremely important, no doubt. But short of estimating identified causal effects, we can get practical guidance and update our default hypotheses based on our background structural knowledge and observed associations.
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