The THIRD big mistake is epidemiological. The authors assumed - with no evidence whatsoever - that an R(ADIR) of 0 meant immunity This is WRONGpic.twitter.com/2eCmbzdVDH
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But that's not true. They do not calculate either R or R0, they calculate a completely different metric from case numbers and called it R which tbh is another serious problem with the paper
Look more closely, and you'll find that they have constructed R_ADIR as an estimate of R(t)
That's certainly what they argue, but it is at best an extremely vague estimate and definitely not a realistic calculation
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