The Spanish version of the Self-Determination Inventory Student Report: application of item response theory to
C Mumbardó-Adam1, J Guàrdia-Olmos2, C Giné1
1Facultat de Psicologia, Ciències de l'Educació i de l'Esport Blanquerna, Universitat Ramon Llull, Spain.
Background:
A new measure of self-determination, the Self-Determination Inventory: Student Report (Spanish version), has recently been adapted and empirically validated in Spanish language. As it is the first instrument intended to measure self-determination in youth with and without disabilities, there is a need to further explore and strengthen its psychometric analysis based on item response patterns.
Method:
Through item response theory approach, this study examined item observed distributions across the essential characteristics of self-determination.
Results:
The results demonstrated satisfactory to excellent item functioning patterns across characteristics, particularly within agentic action domains. Increased variability across items was also found within action-control beliefs dimensions, specifically within the self-realisation subdomain.
Conclusions:
These findings further support the instrument's psychometric properties and outline future research directions.
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