epidemiology

Model infectious-disease outbreaks — run SIR and SEIR compartmental models, find the epidemic peak height and timing and the final attack rate, compute the basic reproduction number R0 and the herd-immunity threshold, and convert between growth rate, doubling time, and case counts. Includes a stdlib model runner (RK4 integration). Use when the user asks about an SIR/SEIR curve, R0 or Rt, herd immunity, flattening the curve, epidemic peak or final size, or the doubling time of case counts. Informational modeling, not clinical or public-health advice.