Resumen

NOJOSA, Ronaldo Targino. Teoria da Resposta ao Item (TRI): modelos multidimensionais. Est. Aval. Educ. [online]. 2002, n.25, pp.123-166. ISSN 0103-6831.

The item response models currently applied in most educacional evaluations seek to measure a latent trait (ability) which can be represented by only one dimension (unidimensionality). Some educacional evaluations, however, do not fit into a one-dimensional framework. This is case of the ‘Exame Nacional do Ensino Médio’ (ENEM), which has been designed according to a matrix of five different skills. At the outset, this article presents a brief overview of the unidimensional Item Response Theory and some tecniques that are helpful in determining the dimensionality of a given set of items. One of these techniques is the Full Information Factorial Analysis, which we propose as a way to check the dimensionality of ENEM. The results suggest that this exam in 1999 is at least fivefold dimensional. We also present models designed to model multidimensional evaluations.

Palabras clave : Item Response Theory; Multidimensional Item Response Theory; Dimensionality; Factor Analysis.

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