Short Grit Scale (Grit-S): New evidence based on CFA and MIRT models

• Autores: Yupanqui-Lorenzo, Daniel E., Becerra-Herrera, Wilson A., Díaz-Leon, Iván, Cardoza Sernaqué, Manuel Antonio, Olivera-Carhuaz, Edith S.
• Formato: artículo
• Fecha de Publicación: 2023
• Institución: Universidad Autónoma del Perú
• Repositorio: AUTONOMA-Institucional
• Lenguaje: inglés
• OAI Identifier: oai:repositorio.autonoma.edu.pe:20.500.13067/3179
• Enlace del recurso: https://hdl.handle.net/20.500.13067/3179; https://doi.org/10.12795/revistafuentes.2024.23182
• Nivel de acceso: acceso abierto
• Materia: Psychometrics; Educational psychology; Higher education; Measuring instruments; Achievement motivation; Factor analysis; University students; Psychological research; https://purl.org/pe-repo/ocde/ford#5.01.00

Studying grit's measurement helps to understand this psychological phenomenon associated with success. Grit-S structures of one-factor and two-factor have been reported in the literature, but there is a lack of reports based on Item Response Theory (IRT). Therefore, two objectives were proposed: to determine the factorial structure of the Spanish version of the Grit-S and explore the instrument through a Multidimentional Item Response Theory (MIRT) analysis. A nonprobabilistic sample of 899 subjects (41.0% female) was evaluated. The 8 items grit scale was used. The Confirmatory Factor Analysis (CFA) showed that the two-factor model obtained a good fit (CFI = 0.97, TLI = 0.95, RMSEA [90%CI] = 0.08 [0.07, 0.10]) unlike the one-dimensional model. An exploratory comparison analysis by MIRT also revealed that the two-factor model performed better (p < 0.001). Consequently, a confirmatory analysis determined an adequate fit of the two-factor model (C2 = 45.4; RMSEA [90%CI] = 0.05 [0.04 - 0.07]; TLI = 0.97; CFI = 0.99). Multidimensional discrimination values were within the expected range (> 1; > 1.5), although item 2 had low discrimination. Regarding difficulty, all items had a monotonic increase. The two-factor model fits the data by both CFA and MIRT. Both complementary analyzes demonstrate the potential of Grit-S to measure latent consistency and perseverance factors.