Actually the 0.9% is based on the April serology. Depending on how you account for right-censoring, the serology from April implies an IFR of 0.77-1% in NYC
Sample definitely isn't way too small, it's far more about design than specifically large sample sizes. Some of the more robust epidemiological surveys in the US have only 10k participants total
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It’s way too small & narrow for NYC’s heterogeneity. Neighborhoods, apartment complexes & nursing homes w/ massive outbreaks & 50+% seroprevalence had ZERO representation in NYC sample. People who make livings underwriting this risk know it as do all the quants here. IFRs lower.
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Look, I'm not going to go over epidemiological sampling for you any more, it's a complex topic and there's only so much time in the world. Look it up sometime

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