Watson Roger, Egberink Iris J L, Kirke Lisa, Tendeiro Jorge N, Doyle Frank
Faculty of Health and Social Care, University of Hull, Hull, UK.
Department of Psychometrics and Statistics, University of Groningen, Groningen, The Netherlands.
Health Psychol Behav Med. 2018 Aug 8;6(1):203-213. doi: 10.1080/21642850.2018.1505520.
Sample size in Mokken scales is mostly studied on simulated data, reflected in the lack of consideration of sample size in most Mokken scaling studies. Recently, [Straat, J. H., van der Ark, L. A., & Sijtsma, K. (2014). Minimum sample size requirements for Mokken scale analysis. , , 809-822] provided minimum sample size requirements for Mokken scale analysis based on simulation. Our study uses real data from the Warwick-Edinburgh Mental Well-Being Scale ( = 8463) to assess whether these hold. We use per element accuracy to evaluate the impact of sample size, with scaling coefficients and confidence intervals around scale, item and item pair scalability coefficients. Per element accuracy, scalability coefficients, and confidence intervals around scalability coefficients are sensitive to sample size. The results from Straat et al. were not replicated; depending on the main goal of the research, sample sizes ranging from > 250 to > 1000 are needed. Using our pragmatic approach, some practical recommendations are made regarding sample sizes for studies of Mokken scaling.
莫肯量表的样本量大多是在模拟数据上进行研究的，这反映在大多数莫肯量表研究中缺乏对样本量的考虑。最近，[斯特拉特，J. H.，范德阿尔克，L. A.，& 西茨马，K.（2014年）。莫肯量表分析的最小样本量要求。，，809 - 822]基于模拟给出了莫肯量表分析的最小样本量要求。我们的研究使用来自沃里克 - 爱丁堡心理健康量表的真实数据（ = 8463）来评估这些要求是否适用。我们使用元素级准确性来评估样本量的影响，包括量表系数以及围绕量表、项目和项目对可扩展性系数的置信区间。元素级准确性、可扩展性系数以及围绕可扩展性系数的置信区间对样本量敏感。斯特拉特等人的结果未被复制；根据研究的主要目标，需要样本量从 > 250 到 > 1000 不等。使用我们的实用方法，针对莫肯量表研究的样本量提出了一些实用建议。
