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Article

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Accepted version

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2011

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/32174

Choosing among techniques for quantifying single-case intervention effectiveness

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Related resource

http://dx.doi.org/10.1016/j.beth.2010.12.003

Abstract

If single case experimental designs are to be used to establish guidelines for evidence-based interventions in clinical and educational settings, numerical values that reflect treatment effect sizes are required. The present study compares four recently developed procedures for quantifying the magnitude of intervention effect using data with known characteristics. Monte Carlo methods were used to generate AB designs data with potential confounding variables (serial dependence, linear and curvilinear trend, and heteroscedasticity between phases) and two types of treatment effect (level and slope change). The results suggest that data features are important for choosing the appropriate procedure and, thus, inspecting the graphed data visually is a necessary initial stage. In the presence of serial dependence or a change in data variability, the Nonoverlap of All Pairs (NAP) and the Slope and Level Change (SLC) were the only techniques of the four examined that performed adequately. Introducing a data correction step in NAP renders it unaffected by linear trend, as is also the case for the Percentage of Nonoverlapping Corrected Data and SLC. The performance of these techniques indicates that professionals" judgments concerning treatment effectiveness can be readily complemented by both visual and statistical analyses. A flowchart to guide selection of techniques according to the data characteristics identified by visual inspection is provided.

Subject

Investigació de cas únic, Mètode de Montecarlo, Psicologia experimental

Subject (English)

Single subject research, Monte Carlo method, Experimental psychology

Citation

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Articles publicats en revistes (Psicologia Social i Psicologia Quantitativa)

Citation

MANOLOV, Rumen, et al. Choosing among techniques for quantifying single-case intervention effectiveness. Behavior Therapy. 2011. Vol. 42, num. 3, pags. 533-545. ISSN 0005-7894. [consulted: 18 of August of 2026]. Available at: https://hdl.handle.net/2445/32174

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