負Alpha信度係數指標在運動技能測驗之研究

本研究的目的是探討負Alpha信度係數問題，並尋求適當的表示運動技能測驗的信度。從測量理論分析Alpha信度係數的背景，再以運動技能重複測量單一項目測驗的實例說明，比較古典測量理論的Alpha係數、組內相關係數和Rasch個別信度係數的誤差，結果發現：在受試者同質性高且重複測量單一項目 (MASI)的運動技能測驗情況下，Alpha係數容易得到負值，而Rasch個別信度係數能有效的估計測驗信度。本研究的結論為：Rasch個別信度係數（separation reliability coefficients）能夠有效的克服負Alpha係數的問題。

關鍵字

運動技能測驗；負Alpha係數；古典測量理論；信度； Rasch個別信度係數

並列摘要

The purpose of the study was to investigate the meaning of negative coefficient alpha as an index of psychomotor tests. The background of psychometric theories was analyzed to the coefficient alpha for reliability. An illustration of the test of multiple-attempt, single-item had introduced. The errors of test scores were compared to the coefficient alpha and intraclass correlation coefficient of classical test theory and Rasch separation reliability coefficients. The result indicated that negative value of generating in the methods of coefficient alpha. They are not satisfaction both the high homogeneity of subjects and Multiple-Attempt, Single-Item Tests in the psychomotor. But, Rasch separation reliability coefficients can be valid estimation a tests' reliability. The conclusion of this study was that the Rasch separation reliability coefficients were valid overcome with the problem of negative coefficient alpha.

並列關鍵字

psychomotor tests ； negative coefficient alpha ； classical test theory ； reliability ； Rasch separation reliability coefficients

參考文獻

American Educational Research Association, American Psychological Association, & National Council on Measurement in Education(1999).The Standards for Educational and Psychological Testing.