https://en.wikipedia.org/wiki/Sigmoid_function
https://en.wikipedia.org/wiki/Gompertz_curve
The basic idea is that the ratio of infected to susceptible people grows exponentially to infinity, which means the absolute number of infected people follows a logistic function.
I tried this with the China data and it seems to fit well, thanks.
https://en.wikipedia.org/wiki/Sigmoid_function
https://en.wikipedia.org/wiki/Gompertz_curve
The basic idea is that the ratio of infected to susceptible people grows exponentially to infinity, which means the absolute number of infected people follows a logistic function.
I tried this with the China data and it seems to fit well, thanks.