A Sagarin difference is a statistical calculation used to determine the relative strength of two teams in a particular sport, such as football or basketball. The Sagarin difference is calculated by subtracting the Sagarin rating of one team from the Sagarin rating of the other team. Sagarin ratings are a type of power rating system that uses a mathematical formula to rate teams based on their performance in past games, taking factors such as margin of victory and strength of schedule into account. The Sagarin difference is commonly used by sports analysts and handicappers to help predict the outcomes of upcoming games.