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Browsing by Author "Dinero, Thomas E."

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    Applicability of the Rasch model with varying item discriminations
    (1977) Dinero, Thomas E.; Haertel, Edward
    Among the varieties of logistic models, those attributed to Birnbaum (involving the parameters of item discrimination, item difficulty, and person ability) and Rasch (involving only item difficulty and person ability) have received attention. The present research simulated the responses of 75 subjects responding to 30 items under the Birnbaum model and then attempted a fit to the data using the Rasch model. When item discriminations varied from a variance of .05 to .25 within distributions of different form (uniform, normal, and positively skewed), the poorest overall fit appeared within the uniform distribution. For each distribution there was only a slight increase in the lack of fit as the variances increased.
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    A cross-cultural analysis of the fairness of the Cattell Culture Fair Intelligence Test using the Rasch model
    (1981) Nenty, H. Johnson; Dinero, Thomas E.
    Logistic models can be used to estimate item parameters of a unifactor test that are free of the examinee groups used. The Rasch model was used to identify items in the Cattell Culture Fair Intelligence Test that did not conform to this model for a group of Nigerian high school students and for a group of American students, groups believed to be different with respect to race, culture, and type of schooling. For both groups a factor analysis yielded a single factor accounting for 90% of the test’s variance. Although all items conformed to the Rasch model for both groups, 13 of the 46 items had significant between score group fit in either the American or the Nigerian sample or both. These were removed from further analyses. Bias was defined as a difference in the estimation of item difficulties. There were six items biased in "favor" of the American group and five in "favor" of the Nigerian group; the remaining 22 items were not identified as biased. The American group appeared to perform better on classification of geometric forms, while the Nigerians did better on progressive matrices. It was suggested that the replicability of these findings be tested, especially across other types of stimuli.