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A study from Bangladesh touted by advocates of mask mandates already has been accused of design flaws and overstated findings, and now a researcher is spotlighting the minuscule infection differences between “treatment” and control groups randomized across 600 villages.
University of California Berkeley professor Ben Recht, who studies machine learning, pointed out in an essay that in a total study population of 342,126 adults, 1,106 people in the control group tested positive, compared to 1,086 in the treatment group, Just the News reported .
“I have a hard time going from these numbers to the assured conclusions that ‘masks work’ that was promulgated by the media or the authors after this preprint [not yet peer reviewed] appeared,” he wrote.
Recht said the “raw number of seropositive cases” had been left out of the preprint by researchers, preventing him from “computing standard statistical analyses of their results.”
The researchers, led by Yale University economists Jason Abaluck and Ahmed Mobarak, posted the replication code and data in early November
That was long after media coverage touted “the largest randomized trial to demonstrate the effectiveness of surgical masks, in particular, to curb transmission of the coronavirus,” Just the News said.
Recht pointed out the study was not blinded, did not exclude pre-intervention infections and was “highly complex” because of the mixed interventions.
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One of the study authors, Abaluck, responded to Recht’s analysis in an email to Just the News, calling it “deeply flawed.”
Recht, Abaluck wrote, agrees that “our intervention led to a roughly 10% reduction in symptomatic seropositivity (going from 12% to 41% of the population masked).””Taking this estimate at face value, going from no one masked to everyone masked would imply a considerably larger effect” — a 33% reduction in COVID,” the Yale researcher said.”People underwhelmed by the absolute number of cases prevented need to ask, what did you expect if masks are as effective as the observational literature suggests?”Abaluck agreed with Recht that “survey response bias is a potential concern.” But he argued the “direction of the bias is unclear — individuals might be more attuned to symptoms in the treatment group.”Recht gave a short response in […]
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