A new metric for conceptualizing cases

Last week, a new metric appeared in the COVID Tracking Project’s daily updates. Here’s how it works. You take the number of COVID-19 cases reported in the past week and divide the current U.S. population by that case number. There are variations; the metric may also be calculated for different time spans or smaller geographies, such as a specific U.S. state. But the standard calculation focuses on the nation, over the past week.

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