Paper on which the code is based: <a href="https://www.nature.com/articles/s41591-020-0916-2" rel="nofollow">https://www.nature.com/articles/s41591-020-0916-2</a><p>The RIVM, the Dutch public health agency, referred me to this paper after I asked about combinations of symptoms (their website[1] only lists individual symptom occurrence percentages for seropositive and seronegative cases). Given that most people will not read a scientific paper and calculate that formula, I thought this might be helpful to others.<p>Disclaimer, as is also written on the site in bold and red: <i>this is NOT validated or endorsed by the authors of that paper and this is NOT a replacement for a real COVID-19 test!</i> The point is to give a rough indication using the same phrasing and exact model from the paper.<p>[1] <a href="https://www.rivm.nl/pienter-corona-studie/resultaten" rel="nofollow">https://www.rivm.nl/pienter-corona-studie/resultaten</a> (Dutch, see "Tabel 1")