Item Position and Item Difficulty Change in an IRT-Based Common Item Equating Design
| Autor: | Walter D. Way, Jason L. Meyers, G. Edward Miller |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Rasch model
Item bank Linear-on-the-fly testing behavioral disciplines and activities Differential item functioning Education Classical test theory Equating Item response theory Developmental and Educational Psychology Econometrics sense organs Computerized adaptive testing skin and connective tissue diseases Psychology |
| Zdroj: | Applied Measurement in Education. 22:38-60 |
| ISSN: | 1532-4818 0895-7347 |
| DOI: | 10.1080/08957340802558342 |
| Popis: | 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, test level, test content, and item format. As a follow-up to the real data analysis, a simulation study was performed to assess the effect of item position change on equating. Results from this study indicate that item position change significantly affects change in RID. In addition, although the test construction procedures used in the investigated state seem to somewhat mitigate the impact of item position change, equating results might be impacted in testing programs where other test construction practices or equating methods are utilized. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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