Journal ArticleDOI
Operating characteristics of a rank correlation test for publication bias.
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In this paper, an adjusted rank correlation test is proposed as a technique for identifying publication bias in a meta-analysis, and its operating characteristics are evaluated via simulations, and the test statistic is a direct statistical analogue of the popular funnel-graph.Abstract:
An adjusted rank correlation test is proposed as a technique for identifying publication bias in a meta-analysis, and its operating characteristics are evaluated via simulations. The test statistic is a direct statistical analogue of the popular "funnel-graph." The number of component studies in the meta-analysis, the nature of the selection mechanism, the range of variances of the effect size estimates, and the true underlying effect size are all observed to be influential in determining the power of the test. The test is fairly powerful for large meta-analyses with 75 component studies, but has only moderate power for meta-analyses with 25 component studies. However, in many of the configurations in which there is low power, there is also relatively little bias in the summary effect size estimate. Nonetheless, the test must be interpreted with caution in small meta-analyses. In particular, bias cannot be ruled out if the test is not significant. The proposed technique has potential utility as an exploratory tool for meta-analysts, as a formal procedure to complement the funnel-graph.read more
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Associations between Hemodialysis Access Type and Clinical Outcomes: A Systematic Review
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References
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Journal ArticleDOI
Publication bias in clinical research
TL;DR: The presence of publication bias in a cohort of clinical research studies is confirmed and it is suggested that conclusions based only on a review of published data should be interpreted cautiously, especially for observational studies.
Book
Summing Up: The Science of Reviewing Research
TL;DR: A Checklist for Evaluating Reviews Reference Index as discussed by the authors is a checklist for evaluating reviews that is based on a reviewing strategy and a review review strategy that is organized by the division of labor.
Journal ArticleDOI
Summing Up: The Science of Reviewing Research.
TL;DR: In this article, the authors summarize the science of reviewing research, including the review process, the review review process itself, and the reviewer's role in reviewing research articles, as well as the process of reviewing the review articles.
Journal ArticleDOI
Factors Influencing Publication of Research Results: Follow-up of Applications Submitted to Two Institutional Review Boards
TL;DR: There was evidence of publication bias in that for both institutional review boards there was an association between results reported to be significant and publication and contrary to popular opinion, publication bias originates primarily with investigators, not journal editors.
Journal ArticleDOI
Publication bias : a problem in interpreting medical data
Colin B. Begg,Jesse A. Berlin +1 more
TL;DR: In this paper, the authors review the available research, discuss alternative suggestions for conducting unbiased meta-analysis and suggest some scientific policy measures which could improve the quality of published data in the long term.