These values can be used to calculate S, I, Imm, and daily new cases (Equation 11-15) that day. Please see SI Excel sheets for the detailed calculations on both models. Each student was assigned a state and was instructed to use a source whose data can be verified by the CDC. Daily cases can be found by subtracting that day's positive case count by the day before giving roughly the change in S with the assumption that everyone counted in the N value will be susceptible and ignore infectious people who were not tested. A smoothed daily case count can then be generated with a moving average of the daily change in cases with 3 days before and after(Figure ).