作者: Erling B. Andersen
DOI: 10.1007/BF02291180
关键词: Mathematics 、 Item analysis 、 Rasch model 、 Econometrics 、 Goodness of fit 、 Test (assessment) 、 Polytomous Rasch model 、 Psychometrics 、 Statistics 、 Constant (mathematics) 、 Logarithm
摘要: The Rasch model is an item analysis with logistic characteristic curves of equal slope,i.e. constant discriminating powers. proposed goodness fit test based on a comparison between difficulties estimated from different scoregroups and over-all estimates. Based the within scoregroup estimates conditional likelihood ratio formed. It shown that—2 times logarithm this isx 2-distributed when true. power discussed for alternative models curves, but unequal items scholastic aptitude test.