In other words, the R0 is based on a situation where no one is immune - the default for a novel virus - and no one is social distancing in any waypic.twitter.com/ug3ggyBLOA
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To an extent, R gives you an idea of the DIRECTION of the epidemic, without telling you much about how a country or area is actually doingpic.twitter.com/0PxWyUKrNr
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It's also RETROSPECTIVE, which means you can only have a decent idea of R a few days or even a week after the fact (this is based on the serial interval) New infections tomorrow means that the R may be higher today than you thought!
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All of this is why it is very hard to see how you could base fast-moving policy decisions on R (it's also a bit of a pain to calculate)
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If you ARE going to use R as a metric on which to base policy, it's probably a good idea to include a bunch of other metrics as well This is a good thing - more data is always useful!
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