Important for updating on prevalence of "asymptomatic COVID" — many may be asymptomatic when they test positive, but go on to develop symptomshttps://twitter.com/Iceland_Review/status/1245690575808008192 …
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This seems especially likely to throw off your data if you rapidly ramp up testing capacity while the real-world spread still fits an exponential curve, since a much larger % of your cases will be from the last week than from 2 weeks ago
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There's a similar problem with trying to get a handle on CFR — if your cases are still growing exponentially, but it takes 3-4 weeks for people to fall mortally ill, a disproportionately large number of new cases will mask the deaths from earlier cohorts
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