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Henson, Robert; Roussos, Louis; Douglas, Jeff; He, Xuming – Applied Psychological Measurement, 2008
Cognitive diagnostic models (CDMs) model the probability of correctly answering an item as a function of an examinee's attribute mastery pattern. Because estimation of the mastery pattern involves more than a continuous measure of ability, reliability concepts introduced by classical test theory and item response theory do not apply. The cognitive…
Descriptors: Diagnostic Tests, Classification, Probability, Item Response Theory
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Potenza, Maria T.; Dorans, Neil J. – Applied Psychological Measurement, 1995
A classification scheme is presented for procedures to detect differential item functioning (DIF) for dichotomously scored items that is applicable to new DIF procedures for polytomously scored items. A formal development of a polytomous version of a dichotomous DIF technique is presented. (SLD)
Descriptors: Classification, Evaluation Methods, Identification, Item Bias