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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
Andrich, David; Hagquist, Curt – Educational and Psychological Measurement, 2015
Differential item functioning (DIF) for an item between two groups is present if, for the same person location on a variable, persons from different groups have different expected values for their responses. Applying only to dichotomously scored items in the popular Mantel-Haenszel (MH) method for detecting DIF in which persons are classified by…
Descriptors: Test Bias, Test Items, Item Response Theory, Statistical Analysis
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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