There is an article in "The Atlantic" titled "A New Statistic Reveals Why America’s COVID-19 Numbers Are Flat": https://www.theatlantic.com/technology/archive/

There is an article in "The Atlantic" titled "A New Statistic Reveals Why America’s COVID-19 Numbers Are Flat": https://www.theatlantic.com/technology/archive/2020/04/us-coronavirus-outbreak-out-control-test-positivity-rate/610132/ https://www.theatlantic.com/technology/archive/2020/04/us-co... the article discusses the use of "positivity rate" by doctors and epidemiologists, whom in recent months I have come to view as charlatans. To the good, the article at least tries to justify the statistic "positivity rate" somewhat. My conclusion is that it is both more honest and more enlightening simply to provide to the public the two numbers (total tests, positive tests) rather than a quantity derived from the two, such as "positivity rate" which can be easily misunderstood, misinterpreted or misused.