Cumulative incidence of coronavirus infections was computed from zip code-specific data, reported by the New York Department of Public Health, and census data on zip code-specific populations. Incidence rates were rendered visually in a three-class color scheme, where light green represents less than 70 cases per 10,000, medium green corresponds to at least 70 but less than 100 cases per 10,000, an dark green corresponds to at least 100 cases per 10,000. The two images represent the cumulative incidence as of March 31 and April 8, 2020, respectively. See Harris, J.E. The Subways Seeded the Massive Coronavirus Epidemic in New York City, April 13, 2020, to appear as National Bureau of Economic Research Working Paper 27021.
Life Under Quarantine 