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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)

Simultaneous DIF Amplification and Cancellation: Shealy-Stout's Test for DIF.

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Nandakumar, Ratna – 1992

The phenomenon of simultaneous differential item functioning (DIF) amplification and cancellation and the role of the SIBTEST computer program in detecting it were studied. A variety of simulated test data was generated for this purpose. In addition, the following real test data were used: (1) American College Testing program data for 2,115 males…

Descriptors: Black Students, Comparative Testing, Computer Simulation, Computer Software