Systematic Use of Visual Analysis for Assessing Outcomes in Single Case Design Studies

Single case designs (SCDs) allow researchers to objectively evaluate the impact of an intervention by repeatedly measuring a dependent variable across baseline and intervention conditions. Rooted in baseline logic, SCDs evaluate change over time, with each participant serving as his or her own contr...

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Bibliographic Details
Published in:Brain impairment 2018-03, Vol.19 (1), p.4-17
Main Authors: Ledford, Jennifer R., Lane, Justin D., Severini, Katherine E.
Format: Article
Language:English
Subjects:
Behavior
Dependent variables
Graphs
Internal validity
Intervention
Neurological disorders
Single-case research
Statistical analysis
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Summary:Single case designs (SCDs) allow researchers to objectively evaluate the impact of an intervention by repeatedly measuring a dependent variable across baseline and intervention conditions. Rooted in baseline logic, SCDs evaluate change over time, with each participant serving as his or her own control during the course of a study. Formative and summative evaluation of data is critical to determining causal relations. Visual analysis involves evaluation of level, trend, variability, consistency, overlap, and immediacy of effects within (baseline and intervention) and between conditions (baseline to intervention). The purpose of this paper is to highlight the process for visually analysing data collected in the context of a SCD and to provide structures and procedures for evaluating the six data characteristics of interest. A checklist with dichotomous responses (i.e., yes/no) is presented to facilitate implementation and reporting of systematic visual analysis.
ISSN:1443-9646
1839-5252
DOI:10.1017/BrImp.2017.16