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Please use this identifier to cite or link to this item: http://hdl.handle.net/11299/98621

Title: Applicability of the Rasch model with varying item discriminations
Authors: Dinero, Thomas E.
Haertel, Edward
Issue Date: 1977
Citation: Dinero, Thomas E & Haertel, Edward. (1977). Applicability of the Rasch model with varying item discriminations. Applied Psychological Measurement, 1, 581-592. doi:10.1177/014662167700100413
Abstract: 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.
URI: http://purl.umn.edu/98621
Appears in Collections:Volume 01, 1977

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