False positives are not just a result of the testing process. They are also a function of the population being tested. Plus you can't take a minimum value - it will tend to a mean.
That's literally the mathematics assuming a sensitivity of 80% with the numbers from the ONS. 159 samples positive in 209,000 tests means minimum possible spec is 99.92%, 80% sensitivity gives you ~99.9947%
-
-
You can only do that maths with a ground truth. What's your ground truth?
-
Sorry what? As I said, if we assume that the PCR test used by ONS is totally worthless and NEVER picks up any actual infections, because the rate of +ve results is ~8 per 10,000 the minimum POSSIBLE specificity is 99.92%
- Show replies
New conversation -
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.
