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Refinements of Stout's Procedure for Assessing Latent Trait Unidimensionality.

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Nandakumar, Ratna; Stout, William – 1992

A detailed investigation of the statistical procedure of W. Stout (the computer program DIMTEST) for testing the hypothesis that an essentially unidimensional latent trait model fits observed binary response data from a psychological test is presented. One finding is that DIMTEST may fail to perform as desired in the presence of guessing when…

Descriptors: Computer Simulation, Computer Software, Equations (Mathematics), Estimation (Mathematics)

ASCAL: A Microcomputer Program for Estimating Logistic IRT Item Parameters.

Vale, C. David; Gialluca, Kathleen A. – 1985

ASCAL is a microcomputer-based program for calibrating items according to the three-parameter logistic model of item response theory. It uses a modified multivariate Newton-Raphson procedure for estimating item parameters. This study evaluated this procedure using Monte Carlo Simulation Techniques. The current version of ASCAL was then compared to…

Descriptors: Adaptive Testing, Bayesian Statistics, Computer Assisted Testing, Computer Simulation