Analytic methods for questions pertaining to a randomized pretest, posttest, follow-up design
Analytic methods for questions pertaining to a randomized pretest, posttest, follow-up design
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DOI：
10.1207/s15374424jccp3203_15
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发表时间：
2003-09-01
影响因子：
4.2
通讯作者：
Kelley, K
中科院分区：
文献类型：
--
作者：
Rausch, JR;Maxwell, SE;Kelley, K
在随机前测、后测、随访（PPF）设计的框架内，描述了5个关于研究人员可能感兴趣的组间差异的问题。从方法学的角度，通过比较和讨论方差分析（ANOVA）和协方差分析（ANCOVA）方法，并简要讨论这些问题的分层线性模型（HIM），对这5个问题进行了检查。这篇文章表明，预检验应被用作模型中的协变量，而不是作为时间因素的水平或作为组差异分析中的因变量的一部分。研究还表明，后测和随访在群体差异分析中的应用取决于研究者提出的具体问题。
Delineates 5 questions regarding group differences that are likely to be of interest to researchers within the framework of a randomized pretest, posttest, follow-up (PPF) design. These 5 questions are examined from a methodological perspective by comparing and discussing analysis of variance (ANOVA) and analysis of covariance (ANCOVA) methods and briefly discussing hierarchical linear modeling (HIM) for these questions. This article demonstrates that the pretest should be utilized as a covariate in the model rather than as a level of the time factor or as part of the dependent variable within the analysis of group differences. It is also demonstrated that how the posttest and the follow-up are utilized in the analysis of group differences is determined by the specific question asked by the researcher.