Analyzing Two-Phase Single-Case Data with Non-overlap and Mean Difference Indices: Illustration, Software Tools, and Alternatives

Frontiers in Psychology
Rumen ManolovSusana Sanduvete-Chaves

Abstract

Two-phase single-case designs, including baseline evaluation followed by an intervention, represent the most clinically straightforward option for combining professional practice and research. However, unless they are part of a multiple-baseline schedule, such designs do not allow demonstrating a causal relation between the intervention and the behavior. Although the statistical options reviewed here cannot help overcoming this methodological limitation, we aim to make practitioners and applied researchers aware of the available appropriate options for extracting maximum information from the data. In the current paper, we suggest that the evaluation of behavioral change should include visual and quantitative analyses, complementing the substantive criteria regarding the practical importance of the behavioral change. Specifically, we emphasize the need to use structured criteria for visual analysis, such as the ones summarized in the What Works Clearinghouse Standards, especially if such criteria are complemented by visual aids, as illustrated here. For quantitative analysis, we focus on the non-overlap of all pairs and the slope and level change procedure, as they offer straightforward information and have shown reasonable perf...Continue Reading

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Citations

Jun 13, 2019·Irish Journal of Psychological Medicine·M E KellyS Brennan
Jan 3, 2018·International Journal of Rehabilitation Research. Internationale Zeitschrift Für Rehabilitationsforschung. Revue Internationale De Recherches De Réadaptation·Charla L HowardDobrivoje S Stokic
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Jul 10, 2021·Behavioural and Cognitive Psychotherapy·Daniel WallstenMaria Tillfors

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Methods Mentioned

BETA
SMA

Software Mentioned

Commander
R
RoBiNT
RcmdrPlugin
Commander Plug - in
ITSACORR
LOESS
SCDA
SLC
SMA

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