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A Priori Justification for Effect Measures in Single-Case Experimental Designs

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Due to the complex nature of single-case experimental design data, numerous effect measures are available to quantify and evaluate the effectiveness of an intervention. An inappropriate choice of the effect measure can result in a misrepresentation of the intervention effectiveness and this can have far-reaching implications for theory, practice and policymaking. As guidelines for reporting appropriate justification for selecting an effect measure are missing, the first aim is to identify the relevant dimensions for effect measure selection and justification prior to data gathering. The second aim is to use these dimensions to construct a user-friendly flowchart or decision tree guiding applied researchers in this process. The use of the flowchart is illustrated in the context of a preregistered protocol. This study is the first study that attempts to propose reporting guidelines to justify the effect measure choice, before collecting the data, to avoid selective reporting of the largest quantifications of an effect. A proper justification, less prone to confirmation bias, and transparent and explicit reporting can enhance the credibility of the single-case design study findings.

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Perspectives on Behavior Science, 2021, vol. 45, num. 1, p. 153-186

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(c) Association for Behavior Analysis International, 2021

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Articles publicats en revistes (Psicologia Social i Psicologia Quantitativa)

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A Priori Justification for Effect Measures in Single-Case Experimental Designs