More clarity on False Positives https://abs.twimg.com/emoji/v2/... draggable="false" alt="👇" title="Rückhand Zeigefinger nach unten" aria-label="Emoji: Rückhand Zeigefinger nach unten">. My calcs w/ 99.25% Specificity (& assume 80% sensitivity & prevalance of 2.2% in tested cohort) -> Positive Predictive Value of 70.58% and Positive Test Percent of 2.49% - which is approx where we are now. i.e 29.4% of +ve test are false https://twitter.com/DavQuinn/status/1308493818027741184">https://twitter.com/DavQuinn/...

It will be surprise to those who see case no.s as accurate representation of infections & comparing to Mar/Apr. Many factors which make no.s now diff to Mar/Apr - extended testing, age, false +ves. Factors are a/c& #39;d for by HSE & doesn& #39;t change underlying acute disease

I am curious how certain cohorts e.g. Meat factories (& school children?) were reported as testing as low as 0.4%. Perhaps there were re-tests involved - otherwise they might be suggestive of sensitivity of c.99.7% rather than 99.25%.