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Evaluation Methods3
Item Response Theory3
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Applied Psychological…3
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Woods, Carol M.2
Su, Ya-Hui1
Wang, Wen-Chung1
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Ramsay-Curve Item Response Theory for the Three-Parameter Logistic Item Response Model
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Woods, Carol M. – Applied Psychological Measurement, 2008
In Ramsay-curve item response theory (RC-IRT), the latent variable distribution is estimated simultaneously with the item parameters of a unidimensional item response model using marginal maximum likelihood estimation. This study evaluates RC-IRT for the three-parameter logistic (3PL) model with comparisons to the normal model and to the empirical…
Descriptors: Test Length, Computation, Item Response Theory, Maximum Likelihood Statistics
Ramsay Curve IRT for Likert-Type Data
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Woods, Carol M. – Applied Psychological Measurement, 2007
Ramsay curve item response theory (RC-IRT) was recently developed to detect and correct for nonnormal latent variables when unidimensional IRT models are fitted to data using maximum marginal likelihood estimation. The purpose of this research is to evaluate the performance of RC-IRT for Likert-type item responses with varying test lengths, sample…
Descriptors: Test Length, Item Response Theory, Sample Size, Comparative Analysis
Factors Influencing the Mantel and Generalized Mantel-Haenszel Methods for the Assessment of Differential Item Functioning in Polytomous Items
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Wang, Wen-Chung; Su, Ya-Hui – Applied Psychological Measurement, 2004
Eight independent variables (differential item functioning [DIF] detection method, purification procedure, item response model, mean latent trait difference between groups, test length, DIF pattern, magnitude of DIF, and percentage of DIF items) were manipulated, and two dependent variables (Type I error and power) were assessed through…
Descriptors: Test Length, Test Bias, Simulation, Item Response Theory