医学院校学习动机强度的测量不变性：多组验证性因素分析
Measurement invariance of the strength of motivation for medical school: a multi-group confirmatory factor analysis.
作者信息
An M, Kusurkar R A, Li L, Xiao Y, Zheng C, Hu J, Chen M
机构信息
Linyi University School of Education, Linyi, China.
Shantou University Medical College, 22 Xinling Road, Shantou, China.
出版信息
BMC Med Educ. 2017 Jul 11;17(1):116. doi: 10.1186/s12909-017-0958-4.
BACKGROUND
The Strength of Motivation for Medical School-Revised (SMMS-R) questionnaire measures students' motivation for studying medicine. It includes three subscales: 'willingness to sacrifice', 'readiness to start', and 'persistence'. Measurement invariance is a prerequisite for group comparisons. The objectives of this study were to verify the factorial structure of the SMMS-R questionnaire and to investigate it's measurement invariance.
METHODS
A total of 989 medical students were approached, 930 cases were kept for data analysis. Factorial structure of and measurement invariance of the SMMS-R were tested using single and multiple group confirmatory factor analyses with Mplus. Trational Cronbach's α along with McDonald's ω and glb were used to measure internal consistency for each subscale.
RESULTS
Internal consistency for subscales and the full instrument were within the acceptable range. A 3-factor structure of the Chinese version of the SMMS-R was supported. Full configural, metric and partial scalar invariance were obtained.
CONCLUSIONS
The SMMS-R showed measurement invariance across gender and two independent samples. So it can be used for group and cross-cultural comparisons.
背景
医学院校学习动机强度修订版（SMMS-R）问卷用于测量学生学习医学的动机。它包括三个子量表：“牺牲意愿”“准备开始”和“坚持性”。测量不变性是进行组间比较的前提条件。本研究的目的是验证SMMS-R问卷的因子结构，并研究其测量不变性。
方法
共接触了989名医学生，保留930例用于数据分析。使用Mplus软件通过单组和多组验证性因子分析对SMMS-R的因子结构和测量不变性进行检验。采用传统的克朗巴哈α系数以及麦克唐纳ω系数和glb来测量每个子量表的内部一致性。
结果
各子量表和整个问卷的内部一致性在可接受范围内。中文版SMMS-R的三因子结构得到支持。获得了完全构型不变性、度量不变性和部分标量不变性。
结论
SMMS-R在性别和两个独立样本中表现出测量不变性。因此，它可用于组间和跨文化比较。
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