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Avaliação Psicológica

Print version ISSN 1677-0471On-line version ISSN 2175-3431


PRIMI, Ricardo. Psychometrics: mathematical foundations of classical test theory. Aval. psicol. [online]. 2012, vol.11, n.2, pp. 297-307. ISSN 1677-0471.

This paper revisits the classic texts in psychometrics and presents the mathematical foundations of the classical test theory. It discusses the mathematical model of factor analysis, the classical linear model, the derivation of the reliability and types of calculation of the reliability coefficient, the standard error of measurement, the integration of validity with factor analysis and, finally, item analysis procedures. The text concerns those who want to deepen their knowledge in the concepts of psychometrics, understanding the origin of the main formulas that we use when doing psychometric analysis of tests and scales.

Keywords : classical test theory; psychometrics; reliability; validity; factor analysis.

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