ERIC Number: ED344935
Record Type: RIE
Publication Date: 1992-Apr
Reference Count: 0
Measurement Accuracy: An Application of Multidimensional Item Response Theory to the Woodcock-Johnson Psycho-Educational Battery-Revised Achievement Scales.
Davison, Mark L.; Chang, Yu-Wen
A two-dimensional, compensatory item response model and a unidimensional model were fitted to the reading and mathematics items in the Woodcock-Johnson Psycho-Educational Battery-Revised for a sample of 1,000 adults aged 20-39 years. Multidimensional information theory predicts that if the unidimensional abilities can be represented as vectors in the two-dimensional solution, then the multidimensional model can be used to obtain ability scores with smaller standard errors. In reading, the multidimensional model yielded scores with smaller standard errors, but multidimensional scores from subtests within reading were identical to the overall reading score. In mathematics, unidimensional scores were non-linearly related to multidimensional ability estimates, and for some subjects, multidimensional ability scores had larger standard errors. There is a 16-item list of references. One table and 12 figures provide analysis information. (Author/SLD)
Descriptors: Achievement Tests, Adults, Equations (Mathematics), Error of Measurement, Estimation (Mathematics), Information Theory, Item Response Theory, Mathematical Models, Mathematics Tests, Measurement Techniques, Multidimensional Scaling, Reading Tests, Scores, Test Validity, Vectors (Mathematics)
Publication Type: Reports - Evaluative; Speeches/Meeting Papers
Education Level: N/A
Authoring Institution: N/A
Identifiers: Ability Estimates; Accuracy; Woodcock Johnson Psycho Educational Battery
Note: Paper presented at the Annual Meeting of the American Educational Research Association (San Francisco, CA, April 20-24, 1992).