项目组合在结构方程模型中的应用

项目组合（itemparceling）是对同一量表中的若干项目进行整合并形成新的观测指标的过程。虽然一直以来它都是一个有争议的议题，但随着其在结构方程模型中的应用日益广泛，它越来越受到研究者重视。文章从项目组合的基本逻辑、优缺点以及具体方法等方面对项目组合的研究进行了概括，并在此基础上提出了使用的具体建议：（1）根据研究的目的与具体情境选择是否需要组合；（2）组合之前必须首先确定概念的维度性；（3）项目组合最好建立在一定的理论基础上等等。未来的研究可以深入探讨各种组合方法对模型拟合以及参数估计的影响以及项目组合在一些SEM高阶应用中的效果，并进一步与项目反应理论等测量理论相结合

Item Parceling Strategies in Structural Equation Modeling

Item parceling could be defined as a technique of composing two or more items assessing the same construct to a new manifest indicator. Although item parceling was controversial all the time, it attracted more and more researchers’ attention since this technique had been widely applied in structural equation modeling procedures. The purpose of this article is to discuss some important aspects about the research in this field, especially the rationale, the advantage and disadvantage, and the methods of parceling practice. On this base, we give some advice about how to construct item parcels, including (a) choosing to parcel or not to parcel according to the research goal and situation; (b) ensuring the dimensionality before parceling; and (c) building parcels on certain theories etc. Future research can focus on the impact of various parceling methods on the model fit and estimates, or the application of parceling in advanced SEM procedures and other measurement theories