SIR Models (IMAGE) Brown University Caption SIR models are used to estimate how a pathogen moves through a population. Researchers at Brown have shown that machine learning can make them more predictive. Credit Karniadakis lab / Brown University Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.