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Andrich, David; Marais, Ida; Humphry, Stephen Mark – Educational and Psychological Measurement, 2016
Recent research has shown how the statistical bias in Rasch model difficulty estimates induced by guessing in multiple-choice items can be eliminated. Using vertical scaling of a high-profile national reading test, it is shown that the dominant effect of removing such bias is a nonlinear change in the unit of scale across the continuum. The…
Descriptors: Guessing (Tests), Statistical Bias, Item Response Theory, Multiple Choice Tests
Reckase, Mark D.; Xu, Jing-Ru – Educational and Psychological Measurement, 2015
How to compute and report subscores for a test that was originally designed for reporting scores on a unidimensional scale has been a topic of interest in recent years. In the research reported here, we describe an application of multidimensional item response theory to identify a subscore structure in a test designed for reporting results using a…
Descriptors: English, Language Skills, English Language Learners, Scores
Humphry, Stephen M. – Educational and Psychological Measurement, 2010
Discrimination has traditionally been parameterized for items but not other empirical factors. Consequently, if person factors affect discrimination they cause misfit. However, by explicitly formulating the relationship between discrimination and the unit of a metric, it is possible to parameterize discrimination for person groups. This article…
Descriptors: Discriminant Analysis, Models, Simulation, Reading Tests
Peer reviewed
Styles, Irene; Andrich, David – Educational and Psychological Measurement, 1993
This paper describes the use of the Rasch model to help implement computerized administration of the standard and advanced forms of Raven's Progressive Matrices (RPM), to compare relative item difficulties, and to convert scores between the standard and advanced forms. The sample consisted of 95 girls and 95 boys in Australia. (SLD)
Descriptors: Adaptive Testing, Computer Assisted Testing, Difficulty Level, Elementary Education