Rasch analysis is a statistical method used to analyze categorical data, particularly in the fields of education and psychology. It is based on the Rasch model, which is a mathematical model that aims to measure a latent trait (such as ability or attitude) from observable responses to a set of items or questions. Rasch analysis helps to determine the difficulty of items, the ability of individuals, and the appropriateness of the items in a given test or assessment. It allows researchers to assess the reliability and validity of the measurement instrument and to make comparisons between different groups of individuals. Overall, Rasch analysis is a powerful tool for understanding and improving the measurement of latent traits in various research settings.