考试实测数据三种信度估计方法的比较  

Comparison of Three Reliability Estimation Methods Based on Measured Data

作　　者：周学路 任杰 Zhou Xuelu;Ren Jie(Beijing Language and Culture University,Beijing,100083)

机构地区：[1]北京语言大学语言科学院语言测试与人才测评研究所,北京100083

出　　处：《考试研究》2022年第6期32-39,共8页Examinations Research

摘　　要：基于某考试实测数据,采取随机抽样和控制变量相结合的方法对α系数、β系数和γ系数在不同的被试同质性和分数分布形态条件下的特点进行比较和验证。结果表明,对于题目同质性程度较高的测验而言,β系数减小了题目同质性对信度估计的影响,得到了比α系数普遍稍高的信度估计值,但存在与α系数相同的不足,即受被试同质性影响较大;γ系数与后二者的估计结果差距略大,但减小了被试同质性对信度估计的影响,具有比α系数和β系数更强的稳定性。Based on the measured data of a certain test,the research uses a combination of random sampling and control variables to compare and verify the characteristics of Alpha coefficient,Beta coefficient and Gamma coefficient under different conditions of the homogeneity of the candidates and the distribution shape of score.The results show that for tests with a high degree of item homogeneity,Beta coefficient reduces the influence of item homogeneity on the reliability estimation,and is generally slightly higher than Alpha coefficient,but it has the same shortcomings as Alpha coefficient which is that it is greatly affected by the homogeneity of the candidates.Gamma coefficient reduces the influence of the homogeneity of the candidates on the reliability estimation,and has stronger stability than the Alpha coefficient and the Beta coefficient,but it is slightly different from the estimation results of the latter two.

关 键 词：信度 α系数 Β系数 γ系数 

分 类 号：G424.74[文化科学—课程与教学论]