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ERIC Number: EJ962951
Record Type: Journal
Publication Date: 2012
Pages: 21
Abstractor: As Provided
Reference Count: 23
ISSN: ISSN-0895-7347
The Impact of Multidirectional Item Parameter Drift on IRT Scaling Coefficients and Proficiency Estimates
Han, Kyung T.; Wells, Craig S.; Sireci, Stephen G.
Applied Measurement in Education, v25 n2 p97-117 2012
Item parameter drift (IPD) occurs when item parameter values change from their original value over time. IPD may pose a serious threat to the fairness and validity of test score interpretations, especially when the goal of the assessment is to measure growth or improvement. In this study, we examined the effect of multidirectional IPD (i.e., some items become harder while other items become easier) on the linking procedure and rescaled proficiency estimates. The impact of different combinations of linking items with various multidirectional IPD on the test equating procedure was investigated for three scaling methods (mean-mean, mean-sigma, and TCC method) via a series of simulation studies. It was observed that multidirectional IPD had a substantive effect on examinees' scores and achievement level classifications under some of the studied conditions. Choice of linking method had a direct effect on the results, as did the pattern of IPD. (Contains 3 tables, 4 figures, and 1 footnote.)
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A