Psychometric Properties of the Indonesian Version of the Personal Growth Initiative Scale-II Using the Graded Response Model
Abstract
Personal Growth Initiative Scale-II (PGIS-II) is the most recent and widely used scale to measure PGI, an active, conscious, focused, and intentional involvement of individuals in their growth process. In the Indonesian context, PGIS-II has been used in several studies, including scale validation using a classical test theory (CTT) approach. However, there is limited validation research using the item response theory (IRT) approach. Therefore, this study aimed to: (1) evaluate the item quality of the Indonesian version of PGIS-II, and (2) assess the scale's measurement precision using the IRT approach. Data were collected through an online survey from 376 participants (aged 15 to 64) and analyzed using RStudio software version 4.2.2. Confirmatory factor analysis showed that the four-factor model was the most appropriate fit for this scale. IRT analysis showed that the GRM model is the best based on data fit and model simplicity. The findings showed this scale has good psychometric properties, in terms of discrimination and location parameters, except for Items 6 and 14. Even with poor-quality items, this scale has provided high-reliability coefficients and meets the criteria of reliable measurement. This scale can assess individuals with very low to average levels of PGI.
Keywords
DOI: 10.22146/gamajop.91368
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