How Prior Information from National Assessments can be used when Designing Experimental Studies without a Control Group
DOI:
https://doi.org/10.17239/jowr-2023.14.03.05Keywords:
Prior information, Baseline comparison, Bayesian inferenceAbstract
National assessments yield a description of the proficiency level in a domain while accounting for differences between tasks. For instance, in writing assessments the level of proficiency is typically evaluated with a variety of topics and multiple tasks. This enables generalizations from specific tasks to a domain. In (quasi-)experimental research, however, writing skills are often evaluated with a single task. Yet, conclusions about the effectiveness of the treatment are formulated on the level of the domain, which is, euphemistically put, quite a stretch. Although conclusions drawn about the effect of the treatment are specific to the task administered, they are often generalized to the domain without any form of reservation. This raises the question whether we can use the results of national assessments about differences between tasks in the analyses of experimental studies. In this paper, we demonstrate how the information of a baseline data set can be used as a kind of control condition in the analysis of an experimental study.
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Copyright (c) 2022 Don Van den Bergh, Nina Vandermeulen, Marije Lesterhuis, Sven De Maeyer, Elke Van Steendam, Gert Rijlaarsdam, Huub Van den Bergh
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