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Peer reviewedZwick, Rebecca; Thayer, Dorothy T.; Mazzeo, John – Applied Measurement in Education, 1997
Differential item functioning (DIF) assessment procedures for items with more than two ordered score categories, referred to as polytomous items, were evaluated. Three descriptive statistics (standardized mean difference and two procedures based on the SIBTEST computer program) and five inferential procedures were used. Conditions under which the…
Descriptors: Item Bias, Research Methodology, Statistical Inference, Test Construction
