Özet:

In the current research, the psychometric properties of the subtests of the MMPI inventory were examined within the scope of item response theory. In this context, item fit indexes were compared under 1PLM, 2PLM and 3PLM, item fit and discrimination indexes were examined, test information functions and total informations were calculated for all subtests. The research data consists of 750 people over the age of 18 who were chosen randomly. All the results of the research were analyzed in the R studio program. Before the research problems, unidimensionality and local independence, which are the assumptions of IRT, were checked. Parallel analysis method was applied for unidimensionality and eigenvalue ratios confirmed that each subtest was unidimensional. The unidimensionality assumption can be presented as evidence for the local independence assumption, the assumptions thought to be provided. In terms of model-data fit, it was found that 2PLM was the best fitting model of all. In general, item discrimination indexes were estimated low and medium level. In test information functions at medium range of −1 < 𝜃 < +1, were calculated that the most informative subtest was Sc(34.97), and the least information subtest was L(3.5). Considering the test information, it was calculated that the highest information belonged to the Sc subtest with 84.61, followed by the Hy subtest with 45.76.

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