Farr was an early public health statistician. His law says that the curve of the number of infected during an epidemic is roughly bell-shaped. He did this by fitting quadratics and cubics to the logarithm of the number of infections. Complete the square on the former then exponentiate to produce the normal distribution.
Exponential growth, Epidemiology, Normal distribution
| 1840 AD | Farr | Farr's Law |
| 1927 AD | Kermack & McKendrick | Standard SIR model |