Objective Measurement in Psychological Science:An Overview of Rasch Model
Yan Zi · 2010
Rasch model is a latent trait model which has drawn international interest among researchers.It provides a promising solution to ensure objective measurement in psychological science.However,the research and applicatoin of Rasch model are not as popular as expected among domestic scholars.Unlike general IRTs that adopt a the model fits position and use different parameters to accommodate idiosyncrasies of set,the Rasch model requires that data fit model.Its unique features including same metric shared by persons and items,data linearity,and parameter separation ensure achievement of objective measurement.The foci of future development of Rasch model include multidimensional Rasch model,test equating and linking,computer adaptive testing,and Rasch-based measurement system such as Lexile framework.