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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
