Poster Presentation: Application of Graded Response Model (GRM) to Investigate Item-level Statistics of the Sinhala Generalized Self-Efficacy Scale (S-GSES)
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Date
2018-08-25
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NSBM Green University
Abstract
The Sinhala Generalized Self-Efficacy scale is a culturally adapted and a validated psychometric scale used to assess the efficaciousness of Individuals. Self-efficacy encompasses a person’s ability to effectively deal with challenging demands and stressful
situations. Exploratory factor analysis conducted in the years of 2015, and 2018 demonstrated unidimensionality, and an internal consistency reliability coefficient of .818 and .860 respectively. To further demonstrate scale s ability in assessing self-efficacy, item
level statistics was investigated in the current study (n=144) using Item Response Theory. Thus, Fumiko Samejima’s Graded Response Model was utilized. All the items were tested under the constrained version and the unconstrained version of the Graded Response Model. The constrained model demonstrated high discrimination across all items (D = 3.190) demonstrating each item’s ability in assessing self efficacy. The unconstrained model demonstrated high discrimination for all items except for items 3, 6, 7, and 8. The items identified to produce low discrimination were tested under the Test Information Function (TIF) to investigate the degree to which each of the items explains the latent structure. Results indicated items 3, 6, 7, and 8 to explain 85.52%, 83.3%, 89.93%, and 89.66% of the latent structure respectively. Further investigation on the overall Item Information Curves (IICs) suggested a strong ability of items to measure self efficacy of individuals at varying levels of ability. All the items demonstrated outstanding discrimination and ability to explain latent structure, confirming the scale’s construct validity.
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Selvaratnam, Naren., Hettiarachchi, Dananjaya (2018) Application of Graded Response Model (GRM) to Investigate Item-level Statistics of the Sinhala Generalized Self-Efficacy Scale (S-GSES), International Conference On Business Innovation (ICOBI), NSBM Green University Town, Sri Lanka. P. 200