Georg Rasch

Georg Rasch was a Danish mathematician and psychometrician who developed a statistical model for measuring abilities and traits, like intelligence or attitudes, through test or survey data. His Rasch model ensures that the results are fair and meaningful by converting raw responses into consistent, interval-level measurements. This approach helps create valid, comparable assessments across different groups and tests. Rasch’s work is widely used in education, psychology, and health to develop better testing designs and to accurately interpret complex data on human abilities and preferences.