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Effect size in clinical phonology.

Judith A Gierut1, Michele L Morrisette

  • 1Department of Speech and Hearing Sciences, Indiana University, Bloomington, IN 47405-7002, USA. gierut@indiana.edu

Clinical Linguistics & Phonetics
|July 27, 2011
PubMed
Summary

Effect size (ES) is crucial for single-subject research in clinical phonology, especially for analyzing treatment effects in children with phonological disorders. Standard mean difference (SMD) is presented as a suitable measure for multiple baseline (MBL) designs.

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Area of Science:

  • Clinical phonology
  • Speech-language pathology
  • Research methodology

Background:

  • Single-subject research designs are common in clinical phonology.
  • Quantifying treatment effects in these studies is essential for evidence-based practice.
  • Meta-analyses require standardized effect size measures.

Purpose of the Study:

  • To advocate for the use of effect size (ES) in single-subject research within clinical phonology.
  • To highlight the utility of ES for future meta-analyses of treatment effects.
  • To introduce and demonstrate the Standard Mean Difference (SMD) as an appropriate ES measure.

Main Methods:

  • Introduction and explanation of Standard Mean Difference (SMD).
  • Illustration of SMD application within the context of a multiple baseline (MBL) design.
  • Discussion of SMD's suitability for evaluating generalization learning.

Main Results:

  • Standard Mean Difference (SMD) is presented as a viable effect size measure.
  • SMD is shown to be applicable to multiple baseline (MBL) designs.
  • SMD facilitates the evaluation of generalization in clinical phonology studies.

Conclusions:

  • Effect size (ES) measures, particularly SMD, should be integrated into single-subject research in clinical phonology.
  • Utilizing ES enhances the ability to conduct meta-analyses on treatment efficacy.
  • Standard Mean Difference (SMD) is a recommended metric for analyzing treatment effects and generalization in phonological disorders research.