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Advances in Psychological Science    2015, Vol. 23 Issue (10) : 1859-1868     DOI: 10.3724/SP.J.1042.2015.01859
Research Methods |
Item Parameter Drift: The Definition and Related Research
YE Meng1; XIN Tao2
(1 Key Laboratory of Modern Teaching Technology, Ministry of Education, Shaanxi Normal University, Xi’an 710062, China)
(2 Institute of Developmental Psychology, Beijing Normal University, Beijing 100875, China)
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Item Parameter Drift (IPD) refers to change in parameter value (s) of the anchor item across several sequential testing occasions or test levels. This concept is essentially different from the concept of Differential Item Functioning (DIF). Current research on IPD spans five aspects: the practical existence, reasons, detection methods, and linking effects of IPD, and the strategy to the outlier anchor item. With respect to horizontal IPD, further and more comprehensive research is needed; esp., we should study the contextual applicability of DIF detection methods in the detection of IPD and develop detection methods for IPD specially, and develop revised linking procedures. Systematic and deep investigations are called up on vertical IPD.

Keywords test linking      parameter invariance      item parameter drift      differential item functioning      nonequivalent groups with anchor test design.     
Corresponding Authors: XIN Tao, E-mail:   
Issue Date: 15 October 2015
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YE Meng,XIN Tao. Item Parameter Drift: The Definition and Related Research[J]. Advances in Psychological Science, 2015, 23(10): 1859-1868.
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