Point and interval estimates of effect sizes for the case-controls design in neuropsychology: rationale, methods, implementations, and proposed reporting standards

John R Crawford, Paul H Garthwaite, Sara Porter

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251 Citations (Scopus)


It is increasingly common for group studies in neuropsychology to report effect sizes. In contrast this is rarely done in single-case studies (at least in those studies that employ a case-controls design). The present paper sets out the advantages of reporting effect sizes, derives suitable effect size indexes for use in single-case studies, and develops methods of supplementing point estimates of effect sizes with interval estimates. Computer programs that implement existing classical and Bayesian inferential methods for the single case (as developed by Crawford, Garthwaite, Howell, and colleagues) are upgraded to provide these point and interval estimates. The upgraded programs can be downloaded from www.abdn.ac.uk/~psy086/dept/Single_Case_Effect_Sizes.htm
Original languageEnglish
Pages (from-to)245-260
Number of pages16
JournalCognitive Neuropsychology
Issue number3
Publication statusPublished - May 2010



  • neuropsychology
  • effect sizes
  • single-case studies
  • single-case methods
  • statistical reform
  • confidence intervals
  • credible intervals

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