Rasch Model

The Rasch model is a way to measure people's abilities or traits, like skills or attitudes, based on their responses to questions or items. It assumes that each person has a certain level of ability, and each question has a certain difficulty. The model predicts that someone with higher ability is more likely to answer difficult questions correctly. By analyzing responses across many people and items, the Rasch model provides a fair and consistent way to assess both the person's ability and the item's difficulty, allowing for meaningful comparisons regardless of different sets of questions.