posted on 2015-10-06, 03:02authored byBrian J. Goode, Siddharth Krishnan, Michael Roan, Naren Ramakrishnan
The nodes, xs, xi, and xr represent counts within a population to the susceptible, infected, and recovered states, respectively. The transmission rate, β, controls the flow of susceptible individuals to infected. The recovery rate, γ, controls the flow of individuals out of the cascade.