Free Covid Tests and Their Accuracy

People in the U.S. can order free Covid at-home tests now at COVIDtests.gov — Free at-home COVID-19 tests. It is great because it is free! But how accurate is it?

It is not hard to find online that the accuracy of at-home tests is about 85%, which means if you are infected, your test will be positive with probability 85%, i.e., Pr( positive | infected ) = 0.85. Here “Pr” means probability; “|” is read…

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