Work out epidemic growth rate instantly with clear inputs, formula shown and shareable results.
Estimates the exponential growth rate from two case counts and converts it into a reproduction number using the mean serial interval.
Growth rate to Rt
r = ln(later cases / earlier cases) / days; Rt = 1 + r x mean serial interval (linear approximation)
It is good for slow growth; for fast growth the moment-generating function of the serial interval distribution should be used.
Yes. A negative rate means cases are declining and implies an Rt below 1.