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Publication bias as a threat to the validity of meta-analytic results

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Abstract

This paper reviews the evidence in support of the contention that publication bias is a potential threat to the validity of meta-analytic results in criminology and similar fields. It then provides a critique of the traditional file drawer or failsafe N method for examining publication bias, and an overview of four newer methods that can be used to detect publication bias. These include two (trim and fill and cumulative meta-analysis) that enable the researcher to estimate the magnitude of the influence of publication bias on the overall mean effect size. Advantages and limitations of both traditional and newer methods are examined. The methods reviewed are illustrated through their application to a meta-analysis of the effects of drug courts on recidivism by Wilson et al. (Journal of Experimental Criminology, 2, 459–487, 2006).

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Notes

  1. Publication bias was originally defined as the publication or non-publication of studies depending on the direction and statistical significance of the results, and the first systematic investigations of publication bias focused on this aspect of the problem. However, as readers will appreciate, there are numerous potential mechanisms for the suppression of information that go well beyond the simple definition given above, including language bias (selective inclusion of studies published in English); availability bias (selective inclusion of studies that are easily accessible to the researcher); cost bias (selective inclusion of studies that are available free or at low cost); familiarity bias (selective inclusion of studies only from one’s own discipline); outcome bias (selective reporting by the author of a primary study of some outcomes but not others depending on the direction and statistical significance of the results) and duplication bias (some findings are likely to be published more than once and may be included more than once in a meta-analysis) . In addition, data may “go missing” for reasons other than those generally considered as causing publication bias, including financial, political, ideological, and professional competing interests of investigators, research sponsors, journal editors and other parties. As all of these sources of bias lead to the same consequence, namely that the literature located by a systematic reviewer will be unrepresentative of the population of completed studies, all raise the same threat to validity. Readers should bear in mind that when they read “publication bias” any or all of these biases may be implied.

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Correspondence to Hannah R. Rothstein.

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Rothstein, H.R. Publication bias as a threat to the validity of meta-analytic results. J Exp Criminol 4, 61–81 (2008). https://doi.org/10.1007/s11292-007-9046-9

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