Abstract
The aim of this study was to explore the psychometric parameters of the Gratitude Questionnaire through the Item Response Theory (IRT), using the Graduated Response Model. Therefore, 533 respondents participated (Mage = 29.9), mostly women (67.7%). At the beginning, we checked the dimensionality of the scale, which supported a quadratic structure (CFI = 0.99; TLI = 0.99). The parameters of the items were performed separately for each factor, and the results indicated that all items adequately discriminate participants. The items of the Gift Recognition factor required a greater amount of theta to be fully endorsed and the Interpersonal Gratitude factor required less amount of theta to be the answer option, perhaps because it is better accepted socially. It is estimated that the objectives of the study were reached, knowing psychometric evidence of a measure that evaluates gratitude in a more inclusive perspective, recommending its use in future possibilities.
Keywords:
gratitude; measure; item response theory; validity; reliability
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