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Download full textLi, Yanmei; Li, Shuhong; Wang, Lin – Educational Testing Service, 2010
Many standardized educational tests include groups of items based on a common stimulus, known as "testlets". Standard unidimensional item response theory (IRT) models are commonly used to model examinees' responses to testlet items. However, it is known that local dependence among testlet items can lead to biased item parameter estimates…
Descriptors: English, Language Tests, Reading Tests, Item Response Theory
Katz, Irvin R.; Xi, Xiaoming; Kim, Hyun-Joo; Cheng, Peter C. H. – Educational Testing Service, 2004
This research applied a cognitive model to identify item features that lead to irrelevant variance on the Test of Spoken English[TM] (TSE[R]). The TSE is an assessment of English oral proficiency and includes an item that elicits a description of a statistical graph. This item type sometimes appears to tap graph-reading skills--an irrelevant…
Descriptors: Test Format, English, Test Items, Language Proficiency
