An Estimate of Unidentified and Total U.S. Coronavirus Cases by State on April 21, 2020

I use data on cumulative tests, positive tests, and deaths for the coronavirus in South Korea and the U.S. lower-48 states during April 2020 to estimate the extent of infection and the unidentified share of the infected population in each state and in the U.S. as a whole on April 21, 2020. I find th...