The aim of this research study was to find out characteristics of items and subtests of Tes Potensi akademik (TP) College Admissions (ujian masuk, UM) UGM 2006 approached by unidimensional and multidimensional item response theory with 3 parameter logistic model. Meanwhile, dimensionality investigated by conditional covariance-based approached.
The data for the research consist of UM UGM 2006 applicants’ responses. The subjects were 15670. The items were calibrated by unidimensional item response theory (UIRT) and multidimensional item response theory (MIRT) with 3 parameter logistic model using BILOG-MG and BMIRT program. Dimensionality assess by semi confirmatory factor analysis using HCA/CCPROX, DETECT, DIMTEST procedures.
Results of the study show that items of Verbal, Quantitative, and Reasoning subtests grouped by HCA/CCPROX and DETECT procedures into 3 clustered as well as the blueprint. Nevertheless, DIMTEST procedure shows that items of Quantitative and Reasoning subtest were locally independent.
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