Rasch Models

Rasch models are statistical methods used in measurement theory to assess how well tests or questionnaires measure abilities or traits, like knowledge or attitudes. They operate on the principle that the probability of a correct response to a question depends on both the person's ability and the difficulty of the question. Rasch models provide a way to create reliable and valid measurements by ensuring that the scoring system is consistent and meaningful, allowing comparisons across different individuals and items. Ultimately, they help in understanding how to improve tests and ensure fair evaluations.