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Direct linkLee, Young-Sun – Applied Psychological Measurement, 2007
This study compares the performance of three nonparametric item characteristic curve (ICC) estimation procedures: isotonic regression, smoothed isotonic regression, and kernel smoothing. Smoothed isotonic regression, employed along with an appropriate kernel function, provides better estimates and also satisfies the assumption of strict…
Descriptors: Nonparametric Statistics, Computation, Item Response Theory, Evaluation Methods
Peer reviewedJunker, Brian; Sijtsma, Klaas – Applied Psychological Measurement, 2001
Discusses usability and interpretation issues for single-strategy cognitive assessment models that posit a stochastic, conjunctive relationship between a set of cognitive attributes to be assessed and performance on particular items/tasks of the assessment. Also discusses stochastic ordering and monotonicity properties that enhance the…
Descriptors: Cognitive Processes, Evaluation Methods, Item Response Theory, Models
Penfield, Randall D. – Applied Psychological Measurement, 2005
Differential item functioning (DIF) is an important consideration in assessing the validity of test scores (Camilli & Shepard, 1994). A variety of statistical procedures have been developed to assess DIF in tests of dichotomous (Hills, 1989; Millsap & Everson, 1993) and polytomous (Penfield & Lam, 2000; Potenza & Dorans, 1995) items. Some of these…
Descriptors: Test Bias, Item Analysis, Psychological Studies, Evaluation Methods
