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关注这篇论文的作者
Matthew J. Vowels

利用条件独立性预先指定结构,优化数据收集与研究透明度

研究问题
如何依据理论及因果结构,识别回答研究问题所必需的变量,从而减少测量负担,同时维持后续分析的有效性?
方法与思路
作者利用结构模型隐含的马尔可夫条件独立关系确定关键子结构,并通过概念综述、教学示例和模拟说明流程。
材料陈述的贡献
摘要称这种结构预先指定可减少非关键变量的收集、提高研究透明度,并以模拟展示精简收集对分析的有限影响。
阅读关注点
应核对关键子结构的判定规则、条件独立关系所需假设,以及删减变量是否改变目标问题和可用识别信息。
阅读边界
这是预印本,同行评审未核验;摘要未说明结构错误或遗漏变量时的保障,也未给出精简收集影响的具体数值。

原文摘要

Data collection and research methodology represents a critical part of the research pipeline. On the one hand, it is important that we collect data in a way that maximises the validity of what we are measuring, which may involve the use of long scales with many items. On the other hand, collecting a large number of items across multiple scales results in participant fatigue, and expensive and time consuming data collection. It is therefore important that we use the available resources optimally. In this work, we consider how a consideration for theory and the associated causal/structural model can help us to streamline data collection procedures by not wasting time collecting data for variables which are not causally critical for subsequent analysis. This not only saves time and enables us to redirect resources to attend to other variables which are more important, but also increases research transparency and the reliability of theory testing. In order to achieve this streamlined data collection, we leverage structural models, and Markov conditional independency structures implicit in these models to identify the substructures which are critical for answering a particular research question. In this work, we review the relevant concepts and present a number of didactic examples with the hope that psychologists can use these techniques to streamline their data collection process without invalidating the subsequent analysis. We provide a number of simulation results to demonstrate the limited analytical impact of this streamlining.

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