better understanding of the issues involved in meta-analyzing single- case designs, we anticipate the development of more sophisticated software programs to facilitate the hands-on labor of data extraction and analysis.
Single-case designs historically have played a prominent role in the evaluation of clinical trials and will continue to do so ( Wachter & Straf, 1990). Unfortunately, single-case data have been excluded from most quantitative literature reviews due to insufficient meta-analytic techniques. However, as this chapter illustrates, methods are under development and being implemented. Although there is no gold standard to date and several data analytic issues remain unresolved, meta-analysts can be encouraged by these developments and need no longer think it necessary to disregard single-case studies from quantitative literature reviews.
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