THE PHILIPPINE APTITUDE CLASSIFICATION TEST: WHY SHIFT FROM CLASSICAL TEST THEORY TO ITEM RESPONSE THEORY?

THE PHILIPPINE APTITUDE CLASSIFICATION TEST: WHY SHIFT FROM CLASSICAL TEST THEORY TO ITEM RESPONSE THEORY?

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THE PHILIPPINE APTITUDE CLASSIFICATION TEST: WHY SHIFT FROM CLASSICAL TEST THEORY TO ITEM RESPONSE THEORY?

The Philippine Aptitude Classification Test (PACT) is an instrument developed by the Center for Educational Measurement, Inc. in response to the need for a comprehensive system of identifying specific abilities of high school students for the purpose of educational and vocational guidance. The present study was designed to investigate which of the two theories, classical test theory (CTT) or item response theory (IRT), would best improve the quality of the PACT in terms of item development, test design, and scoring, and to look into the implications of using IRT for making decisions about career choices. It specifically aimed to (a) evaluate which item response theory model among the one-, two- and threeparameter logistic models was most suitable in evaluating the PACT, and (b) compare the chosen IRT model with the indices of the CTT. The study involved responses on the PACT of 1,023 third year high school students from 28 schools. The findings indicated that the three-parameter model is the most suitable for PACT. Furthermore, the IRT model yielded more accurate estimates over CTT, which in turn would lead to more reliable testtakers’, prediction of success in the appropriate educational courses.

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