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Direct linkAnderson, Daniel; Kahn, Joshua D.; Tindal, Gerald – Applied Measurement in Education, 2017
Unidimensionality and local independence are two common assumptions of item response theory. The former implies that all items measure a common latent trait, while the latter implies that responses are independent, conditional on respondents' location on the latent trait. Yet, few tests are truly unidimensional. Unmodeled dimensions may result in…
Descriptors: Robustness (Statistics), Item Response Theory, Mathematics Tests, Grade 6
Randall, Jennifer; Engelhard, George, Jr. – Applied Measurement in Education, 2010
The psychometric properties and multigroup measurement invariance of scores across subgroups, items, and persons on the "Reading for Meaning" items from the Georgia Criterion Referenced Competency Test (CRCT) were assessed in a sample of 778 seventh-grade students. Specifically, we sought to determine the extent to which score-based…
Descriptors: Testing Accommodations, Test Items, Learning Disabilities, Factor Analysis
