Saifuddin Azwar

Abilitas Komposit dalam Tes Potensi

When a unidimensionality assumption has been actually violated, interpretation of test scores might be jeopardized. It couldn’t be overemphasized in case of high-stake exams such as PAPs UGM (academic potentiality test for UGM graduate student candidates) which was supposed to reflect a composite ability. This study aimed at revealing item characteristics of PAPs A-1 Series based on UIRT and MIRT and discovering dimensionality of the three subtests of the test. Scores of subject (n=2035) on the 3 subtests were analysed and the results showed that 27 items (10 of Verbal, 8 of Kuantitatif, and 9 of Penalaran) were flagged for having rbis of less than 0.25 and 6 other items for having abnormally high pseudo-guessing parameters. Dimensionality analyses found out that Penalaran subtest was local-dependent while Verbal and Kuantitatif subtests both were local-independent. In addition, MIRT analyses failed to fully describe item characteristics of the test due to effect of interaction among probabilities of correct response of the three subtests. Keywords: dimensionality, PAPs UGM, MIRT, UIRT

KUALITAS TES POTENSI AKADEMIK VERSI 07A

Karakteristik butir dan subtes dari Tes Potensi Akademik (TPA) versi 07A diteliti berdasarkan data jawaban 198 pelamar Program Magister Psikologi UGM tahun 2007, sementara validitas prediksi tes dianalisis berdasarkan data jawaban 80 mahasiswa yang diterima. Hasil penelitian menunjukkan bahwa butir-butir subtes verbal, kuantitatif, dan penalaran memiliki tingkat kesulitan sedang, indeks daya beda sangat baik, dan distraktor berfungsi dengan baik. Semua skor subtes memiliki koefisien reliabilitas yang sangat tinggi, demikian juga skor TPA. Namun, analisis validitas skor TPA kurang dapat memprediksi IPK semester pertama. Kata kunci: TPA, analisis butir, validitas prediksi