Product Code Database
Georg William Rasch () (21 September 1901 – 19 October 1980) was a Danish mathematician, statistician, and Psychometrics, most famous for the development of a class of measurement models known as . He studied with Ronald Fisher and also briefly with Ragnar Frisch, and was elected a member of the International Statistical Institute in 1948.
In 1919, Rasch began studying mathematics at the University of Copenhagen. He completed a master's degree in 1925 and received a doctorate in science with thesis director Niels Erik Nørlund in 1930. Rasch married in 1928. Unable to find work as a mathematician in the 1930s, he turned to work as a statistical consultant. In this capacity, he worked on a range of problems, including problems of biological growth.
He later developed the Rasch model for dichotomous data, which he applied to response data derived from intelligence and attainment tests including data collected by the Danish military. At the same epoch, United States scientists independently developed item response theory (IRT). Within IRT, the Rasch model is one of the most simple response models. In contrast to other simple models, the Rasch model has a distinctive mathematical property: the model parameters (item difficulties, examinee ability) are sufficient statistics. Rasch demonstrated that his approach met criteria for measurement deduced from an analysis of measurement in the physical sciences. He also proposed generalizations of his model (Rasch, 1960/1980, 1977).
Today, the Rasch model is used extensively in assessment in education and educational psychology, particularly for attainment and cognitive assessments.
|
|
