Reader Laurence Hodge has sent through (in response to a request made in comments) some graphs looking at SARS-CoV-2 tests done versus positive results. Of course we have to take the positive result numbers with a pinch of salt, but it’s still interesting to see what the relationship is. Here’s the first graph (all graphs can be clicked to enlarge).
Here’s the same data, but with an extra axis on the right-hand side just for the positives so we can zoom in on them more closely.
And here’s a graph of the positives compared to the false positives, assuming a false positive rate of 0.8%, which is about what Matt Hancock thought it was (although I suspect the false positive rate has increased recently due to rising amounts of SARS2 and labs doing more tests than they can properly handle, resulting in contamination).
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