Simple Mathematical Law Predicts Movement in Cities around the World
Scientific American - 09/14/2021
Many researchers estimate travel with “gravity models,” which assume that movement between cities is proportional to their population sizes. But these models do not account for travel patterns within cities—information that is particularly critical in tackling disease transmission. Northeastern University epidemiologist Sam Scarpino, who was not involved in the study, says models based on this new finding might better track that flow.