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Meta-analysis is a statistical methodology for combining results of multiple studies by using the effect size statistic. Meta-analysis has been used to make comparisons of treatment outcomes for different methods of psychotherapy. In general, these studies have found that little or no variance in outcomes can be explained by the method of therapy.

For more on this subject see:

Meta-analysis: wikipedia

Quintana & Minami, 2006 Guidelines for Meta-Analyses of Counseling Psychology Research. The Counseling Psychologist, Vol. 34, No. 6, 839-877. Full text available online.

Wampold BE. 2001. The great psychotherapy debate: Models, Methods, and Findings. Mahwah NJ: Lawrence Erlbaum Associates. 272 pp.

Shapiro DA, Shapiro D. 1982. Meta-analysis of comparative therapy outcome studies: A replication and refinement. Psychol Bull 92:581-604.

Robinson LA, Berman JS, Neimeyer RA. 1990. Psychotherapy for treatment of depression: A comprehensive review of controlled outcome research. Psychol Bull 108:30-49.

Wampold BE, Mondin GW, Moody M, et al. 1997. A meta-analysis of outcome studies comparing bona fide psychotherapies: Empirically, “All must have prizes.” Psychol Bull 122:203-15.

Ahn H, Wampold BE. 2001. Where oh where are the specific ingredients? A meta-analysis of component studies in counseling and psychotherapy. J Counsel Psychol 48:251-7.

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-- JebBrown - 09 Jan 2007
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