Validation and reliability of a sources of knowledge scale for Brazilian coaches

Abstract Aim: The present study examined the validity of the Coaches’ Training Profile Questionnaire (QPFT) in Brazilian coaches. Method: The questionnaire was back-translated and content validation was performed by an expert panel. Construct validation was based on the application of the questionnaire to 212 coaches from the state of Paraná, considering the Cronbach’s alpha to examine internal consistency, Pearson’s correlation and intraclass correlation coefficient (ICC) for test-retest reliability, and exploratory and confirmatory factor analysis. Results: The questionnaire showed high internal consistency, with Cronbach’s alpha coefficient higher than .80. Correlations of the dimensions and ICC of the items indicated high reliability for the three dimensions of the questionnaire. The results of exploratory factor analysis explained a variance of 69.75%, with the AE factor explaining the largest portion of variance (27.01%) and the AT factor explaining the lowest portion of variance (21.14%). The absolute, parsimonious and incremental fit indices [X2 and p-value; X2/df; CFI, PCFI, GFI, PGFI, TLI, RMSEA (with 90% CI), and MECVI] were high. Conclusion: The Brazilian version of the QPFT presents a reliable and valid factor structure to identify coaches’ knowledge sources in Brazil.

### 研究目的
本研究旨在检验巴西教练员版《教练培训概况问卷（Coaches’ Training Profile Questionnaire，QPFT）》的效度。
### 研究方法
本研究对该问卷进行回译，并邀请专家小组开展内容效度检验。结构效度检验环节，向巴西巴拉那州的212名教练员施测该问卷，同时采用克朗巴哈α系数（Cronbach’s alpha）检验内部一致性，采用皮尔逊相关分析与组内相关系数（intraclass correlation coefficient，ICC）检验重测信度，并开展探索性因素分析与验证性因素分析。
### 研究结果
该问卷表现出较高的内部一致性，克朗巴哈α系数高于0.80。问卷各维度间的相关系数与题项组内相关系数均表明，问卷的三个维度具备良好信度。探索性因素分析结果可解释69.75%的总变异，其中AE因子解释的变异占比最大（27.01%），AT因子解释的变异占比最小（21.14%）。绝对拟合、简约拟合与增量拟合指数[χ²与P值、χ²/df、比较拟合指数（CFI）、偏比较拟合指数（PCFI）、拟合优度指数（GFI）、偏拟合优度指数（PGFI）、塔克-刘易斯指数（TLI）、近似误差均方根（RMSEA，90%置信区间）以及最小期望交叉验证指数（MECVI）]均处于较高水平。
### 研究结论
巴西版QPFT具备可靠且有效的因素结构，可用于识别巴西教练员的知识来源。