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Time

Would the time factor make a difference.
On any given day x % could test positive and y% negative
Which and what percentage should you test every day?

If you repeat every day what happens re. Errors?

Kaiser

Time: If there is a reason why when someone tests affects the test result, then that factor has to be accounted for. But that doesn't seem like it applies here. Why are you thinking in that direction? (If you're talking about reporting time versus testing time, that's a different issue.)

Time

Let's leave the time aspect for now. Lets take your example at end and think of it applied 5 times to a manufacturing operation. 5 QC tests to eliminate errors before final output. If we start w1000 units what would be tge number of units at end falling into each of your categories

Kaiser

Time: Are you suggesting that another objection to the "test is inaccurate" excuse is that you can do repeated testing?

Time

Not really. But the likely required administration of testing, and or possible pattern of testing in certain environments will likely lead to repetition. If that is true (and it opens the debate) it would mean that accuracy would also need to measured as part of a process.
(Note some manufacturers state their tests are to be used this manner)

Not challenging your statement re politicians and standalone accuracy.

The e.g given more might apply to someone testing a set group over a period of time.

Time

This will fill some testing gaps https://doi.org/10.1101/2020.04.21.20068858 for

Kaiser

Time: thanks for that paper. I only read the abstract and will read the whole paper once I find some time. This study is very valuable, and its value lies in generalizing to the population. It seems like they should bring on a statistician to help generalize the data. From the abstract, it does not appear that they attempted to measure selection bias.

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