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Direct linkMeyers, Jason L.; Miller, G. Edward; Way, Walter D. – Applied Measurement in Education, 2009
In operational testing programs using item response theory (IRT), item parameter invariance is threatened when an item appears in a different location on the live test than it did when it was field tested. This study utilizes data from a large state's assessments to model change in Rasch item difficulty (RID) as a function of item position change,…
Descriptors: Test Items, Test Content, Testing Programs, Simulation
Puhan, Gautam – Applied Measurement in Education, 2009
The purpose of this study is to determine the extent of scale drift on a test that employs cut scores. It was essential to examine scale drift for this testing program because new forms in this testing program are often put on scale through a series of intermediate equatings (known as equating chains). This process may cause equating error to…
Descriptors: Testing Programs, Testing, Measurement Techniques, Item Response Theory
