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. 2021 Feb 17;16(2):e0246167. doi: 10.1371/journal.pone.0246167

Fig 1. The first regression of log of confirmed cases vs consecutive days for 4 of the total of 50 countries is shown.

Fig 1

Starting with the date of the first case for each country, which was standardized to day 1 for purposes of visual comparison, we examined linear regressions of the log of the daily cumulative COVID-19 cases versus time in sequential days. From this analysis we calculated the resulting regression coefficients (which we termed coefficients of time (CT) with units of log cases/day) for each country.