Interesting comparison - US vs Italy in terms of the daily % increase in case numbers since 100 cases
Italy
every day, trending towards 0
US
every day, trending higher stillpic.twitter.com/fbPPfevE13
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That's why rates are very useful. As long as the protocol is relatively similar, the proportion of cases/true infections will remain relatively steady, meaning this is indicative of actual increases even if the 'true' number of cases is higher
This rate is just (absolute n case t-1)/(absolute n cases t) right? So if you ramp up testing today, your growth rate will be impacted. However, the proportion (cases/n tests) might change and be good indication of real growth in a population.
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