Resumen

KLEIN, Ruben. Use of item Response Theory at the Brazilian Assessment System for Basic Education. Ensaio: aval. pol. públ. educ. [online]. 2003, vol.11, n.40, pp.283-296. ISSN 0104-4036.

The paper introduces Item Response Theory (IRT) in its usual form of one group and for multiple groups and explains how IRT for multiple groups is being used in the Brazilian Assesment System for Basic education (SAE8) for item calibration and for obtaining a unique scale, by discipline, for student proficiencies of the 4^th, 8^th and 11^th grade of Basic Education, for all SAEB's since 1995. The paper presents the adopted equating procedure among grades and among years and introduces a new method for equating assessments that use some SAEB items with SAEB. Finally, the paper explains how SAEB scales are interpreted.

Palabras clave : IRT - Multiple Groups; SAEB; Equating; Scale Interpretation; Proficiency; Bayes Marginal Estimation.

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