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A standardized mean difference effect size for single case designs

Hedges, Larry V., Pustejovsky, James E., Shadish, William R.·2012·Research Synthesis Methods

Abstract

Single case designs are a set of research methods for evaluating treatment effects by assigning different treatments to the same individual and measuring outcomes over time and are used across fields such as behavior analysis, clinical psychology, special education, and medicine. Emerging standards for single case designs have focused attention on the need for effect sizes for summarizing and meta‐analyzing findings from the designs; although many effect size measures have been proposed, there is little consensus regarding their use. This article proposes a new effect size measure for single case research that is directly comparable with the standardized mean difference (Cohen's d) often used in between‐subjects designs. Techniques are provided for estimating the new effect size, as well as its variance, from balanced or unbalanced treatment reversal designs. The proposed estimation methods are further evaluated using a simulation study and then demonstrated in two applications. Copyright © 2012 John Wiley & Sons, Ltd.

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Metadata

Authors
Hedges, L. V., Pustejovsky, J. E., & Shadish, W. R.
Venue
Research Synthesis Methods
Publisher
Wiley
Published
2012-08-14
Volume
3
Issue
3
Pages
224-239
ISSN
  • 1759-2879 (ISSN-L)
  • 1759-2887
OpenAlex
W2064022568
Cited by
305
References
21
FWCI
16.98
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: A standardized mean difference effect size for single case designs. https://app.cochat.ai/papers/10.1002/jrsm.1052
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Hedges, L. V., Pustejovsky, J. E., & Shadish, W. R. (2012). A standardized mean difference effect size for single case designs. Research Synthesis Methods. https://doi.org/10.1002/jrsm.1052

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