Abstract

ESTEVES, Germano Gabriel Lima  and  ANDRADE, Josemberg Moura de. Assessing ITR Parameters of The Varieties of Sadistic Tendencies Items. Psicol. teor. prat. [online]. 2024, vol.26, n.2, ePTPPA15356.  Epub Dec 02, 2024. ISSN 1516-3687.  https://doi.org/10.5935/1980-6906/eptppa15356.en.

This study aimed to estimate the item parameters of the Varieties of Sadistic Tendencies (VAST) through Item Response Theory (IRT) using Samejima’s Graduated Response Model. Hence, 396 participants of both sexes, aged 26.93 (SD=8.91) on average, were included. The participants completed the (1) Varieties of Sadistic Tendencies and a (2) Sociodemographic questionnaire. Confirmatory Factor Analysis (CFA) was performed, which identified a two-dimensional model with appropriate goodness of fit indicators (CFI= .97; TLI= .97; RMSEA= .04). Thus, the item parameters were calculated for each dimension separately. The results indicated that the dimension items showed good discrimination, information breadth, and a good range of response thresholds. The conclusion is that the item parameters of VAST provide information that allows a better interpretation of its scores.

Keywords : sadism; item response theory; dark tetrad; validity; reliability.

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