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Direct linkScarpati, Stanley E.; Wells, Craig S.; Lewis, Christine; Jirka, Stephen – Journal of Special Education, 2011
The purpose of this study was to use differential item functioning (DIF) and latent mixture model analyses to explore factors that explain performance differences on a large-scale mathematics assessment between examinees allowed to use a calculator or who were afforded item presentation accommodations versus those who did not receive the same…
Descriptors: Testing Accommodations, Test Items, Test Format, Validity
