Multiple lines of scientific evidence confirm that masks work. Whether you prefer physics, occupational health data, lab-based studies, behavioral data, or if you’re into epi, science has you covered.https://twitter.com/apoorva_nyc/status/1330287178639962112 …
I’m personally not a fan if ecological studies. Have written that many times. We have mechanisms—as we do for many other things. But in this case the confounding looks like the other way: the spike before and the rising in separate places all push in the opposite direction.
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I agree one can look at this and explain it in a way that's consistent with the theory but that's not what it means to learn something from the study. The pre-mandate data shows these county sets are very different, in ways other than the later implementation of a mask mandate.
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For example, the MMWR is a much more simplistic, naive analysis than the paper below, which tried to disentangle the effects of various interventions and did not find effectiveness for mandates. If we accept ecological data, why the MMWR and not this? https://www.medrxiv.org/content/10.1101/2020.05.28.20116129v4 …
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