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Educational and Psychological Measurement
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Local Item Dependence for Items Across Tests Connected by Common Stimuli

Wen-Chung Wang

National Chung Cheng University, psywcw{at}ccu.edu.tw

Ying-Yao Cheng

National Sun Yat-sen University

Mark Wilson

University of California at Berkeley

A parallel design, in which items across different scales within an instrument share common stimuli and subjects respond to the common stimulus for each scale, is sometimes used in questionnaires or inventories. Because the items across scales share the same stimuli, the assumption of local item independence may not hold, thereby violating the assumption of local item independence under standard psychometric models. In this study, the authors describe a multidimensional item response model to detect specific forms of local item dependence. Three real data sets were analyzed to illustrate implications and applications of the proposed method.

Key Words: test design • item bundle • testlet • multidimensional item response model • Rasch model • item response theory

Educational and Psychological Measurement, Vol. 65, No. 1, 5-27 (2005)
DOI: 10.1177/0013164404268676
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 Applied Psychological MeasurementHome page
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Applied Psychological Measurement, October 1, 2009; 33(7): 555 - 569.
[Abstract] [PDF]