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Han, Kyung T.; Wells, Craig S.; Sireci, Stephen G. – Applied Measurement in Education, 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…
Descriptors: Item Response Theory, Test Items, Scaling, Methods
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Li, Xueming; Sireci, Stephen G. – Educational and Psychological Measurement, 2013
Validity evidence based on test content is of essential importance in educational testing. One source for such evidence is an alignment study, which helps evaluate the congruence between tested objectives and those specified in the curriculum. However, the results of an alignment study do not always sufficiently capture the degree to which a test…
Descriptors: Content Validity, Multidimensional Scaling, Data Analysis, Educational Testing