Two strategies for fitting real data to Rasch polytomous models.
Copyright policy )Two strategies for fitting real data to Rasch polytomous models.
A comparative study of the results provided by two strategies for fitting data to Latent Trait Theory Models has been performed. The first, called Total-Persons-Items (TPI), is structured in three phases: 1) assessment of item fit, 2) assessment of person fit; and finally, 3) overall fit of data to the models (items and persons). The second strategy, the Total-Items-Persons (TIP), changes the order of the phases: 1) assessment of person fit, 2) assessment of item fit and, 3) overall fit of data to the models. To verify the results of these two strategies, a set of 30 items, designed to measure religious attitude, was administered to a sample of 821 persons. The Latent Trait Theory Models used were the Partial Credit Model and the Rating Scale Model. The results underline an important difference between the two procedures: the TPI maximizes the number of persons with good fit and the TIP maximizes the number of items with good fit. Moreover, a procedure for controlling the sensitivity of fit to sample size is proposed.
- University of Almería Spain
Adult, Male, Religion and Psychology, Models, Statistical, Adolescent, Personality Inventory, Psychometrics, Reproducibility of Results, Middle Aged, Attitude, Humans, Female
Adult, Male, Religion and Psychology, Models, Statistical, Adolescent, Personality Inventory, Psychometrics, Reproducibility of Results, Middle Aged, Attitude, Humans, Female
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