"COVID-19 is getting less lethal!"
"Has the denominator changed?"
"...yes"

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Well said. I wonder who will disagree with this, and why.
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I like to check it at least 3 times. Sometimes more. I’ve made a mistake once where I didn’t double check. Fortunately it was coursework in grad school. I’m neurotic about checking! For non-people things, I also check units MANY times.
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Non-epidemiologist here. I think I know broadly what you mean. Is this about many more people getting infected (higher denominator), therefore—even with diminishing lethality & with more effective treatments—the overall hospitalization & death number being higher than ever?
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No, I think cases were hugely underestimated originally. Lethality didn't change, they are just testing more.
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3rd rule check the missing data?
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Love it! So true
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Also #1 in social survey tabulations & analyses. Or large, complex administrative datasets.
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Additional consideration even before you get to rule 1: Look in the mirror and ask yourself "am I actually an epidemiologist?" The answer may be "I am a random bloke on my sofa" or "I am a celebrity chef", in which case: take pause.
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Addendum to consideration: should people attempt to understand, learn about, question or offer insights to fields outside our expertise?
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