Shouldn't this tool allow for modifying the numbers in the "Severity assumptions" section, too? This uses the same estimate from the Imperial College model, which is basically an educated guess at this point:
> A total of 72,314 patient records—44,672 (61.8%) confirmed cases, 16,186 (22.4%) suspected cases, 10,567 (14.6%) clinically diagnosed cases (Hubei Province only), and 889 asymptomatic cases (1.2%)—contributed data for the analysis.
Another study guesses that 86% of cases are asymptomatic and/or otherwise undocumented:
> A total of 72,314 patient records—44,672 (61.8%) confirmed cases, 16,186 (22.4%) suspected cases, 10,567 (14.6%) clinically diagnosed cases (Hubei Province only), and 889 asymptomatic cases (1.2%)—contributed data for the analysis.
Another study guesses that 86% of cases are asymptomatic and/or otherwise undocumented:
https://science.sciencemag.org/content/early/2020/03/13/scie...