Do Masks Work?
With regard to COVID, we are awash in unreliable or even intentionally misleading empirical claims. A neurosurgeon from D.C. who understands statistics analyzes a popular claim that is being made on behalf of mask mandates. I encountered a Washington Post figure making its way through social media, suggesting that not wearing masks is conclusively the reason for COVID spread: If you look at the figure closely, the y-axis is "% who know someone with COVID-19." Why on earth would any reasonable scientist or public health official use this "survey" variable to honestly study a scientific/public health effect? The reason is, it is...
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