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Download full textMoses, Tim; Miao, Jing; Dorans, Neil – Educational Testing Service, 2010
This study compared the accuracies of four differential item functioning (DIF) estimation methods, where each method makes use of only one of the following: raw data, logistic regression, loglinear models, or kernel smoothing. The major focus was on the estimation strategies' potential for estimating score-level, conditional DIF. A secondary focus…
Descriptors: Test Bias, Statistical Analysis, Computation, Scores
Young, John W.; Holtzman, Steven; Steinberg, Jonathan – Educational Testing Service, 2011
In this research investigation of score comparability for language minority students (English language learners [ELLs] and former English language learners), we examined 3 indicators of score comparability (reliability, internal test structure, and differential item functioning) for 4th and 8th grade students who took the NCLB-mandated content…
Descriptors: Language Minorities, Second Language Learning, Grade 8, Minority Group Students
