태권도 선수의 지도자 신뢰 척도에 대한 문항반응이론 기반 측정 특성 분석 = Measurement Characteristics of the Coach Trust Scale for Taekwondo Athletes: An Item Response Theory Approach

다국어 초록 (Multilingual Abstract)

Purpose: The purpose of this study was to examine the measurement characteristics of the coach trust scale for Taekwondo athletes using an item response theory approach.
Methods: The participants were 325 poomsae and freestyle poomsae athletes registered with the Korea Taekwondo Association in 2023. The research instrument was a revised and supplemented version of the coach trust scale originally developed by Clark and Payne (1997) and used in the study by Park (2019). The scale consisted of 15 items across five factors: integrity, ability, consistency, loyalty, and openness. Data analysis was conducted using the R statistical program.
First, confirmatory factor analysis was performed to verify the structural validity of the scale. Subsequently, the Graded Response Model based on Item Response Theory was applied to estimate item discrimination and difficulty parameters and to analyze item functioning. In addition, the test information function was analyzed to examine measurement precision across different levels of the latent trait.
Results: The coach trust scale showed an acceptable fit for the five-factor structure. Item response theory analyses indicated differences in item discrimination and difficulty across items. Several items showed high discrimination, indicating that they effectively distinguished individual differences across latent trait levels. The test information function showed relatively higher information in the low to average range of the latent trait.
Conclusion: This study contributes to the literature by providing item-level evidence on the measurement characteristics of the coach trust scale and highlights the value of applying item response theory in sport psychology measurement research.