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A Nonparametric “Trim and Fill” Method of Accounting for Publication Bias in Meta-Analysis

A Nonparametric “Trim and Fill” Method of Accounting for Publication Bias in Meta-Analysis Abstract Meta-analysis collects and synthesizes results from individual studies to estimate an overall effect size. If published studies are chosen, say through a literature review, then an inherent selection bias may arise, because, for example, studies may tend to be published more readily if they are statistically significant, or deemed to be more “interesting” in terms of the impact of their outcomes. We develop a simple rank-based data augmentation technique, formalizing the use of funnel plots, to estimate and adjust for the numbers and outcomes of missing studies. Several nonparametric estimators are proposed for the number of missing studies, and their properties are developed analytically and through simulations. We apply the method to simulated and epidemiological datasets and show that it is both effective and consistent with other criteria in the literature. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of the American Statistical Association Taylor & Francis

A Nonparametric “Trim and Fill” Method of Accounting for Publication Bias in Meta-Analysis

10 pages

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References (35)

Publisher
Taylor & Francis
Copyright
Copyright Taylor & Francis Group, LLC
ISSN
1537-274X
eISSN
0162-1459
DOI
10.1080/01621459.2000.10473905
Publisher site
See Article on Publisher Site

Abstract

Abstract Meta-analysis collects and synthesizes results from individual studies to estimate an overall effect size. If published studies are chosen, say through a literature review, then an inherent selection bias may arise, because, for example, studies may tend to be published more readily if they are statistically significant, or deemed to be more “interesting” in terms of the impact of their outcomes. We develop a simple rank-based data augmentation technique, formalizing the use of funnel plots, to estimate and adjust for the numbers and outcomes of missing studies. Several nonparametric estimators are proposed for the number of missing studies, and their properties are developed analytically and through simulations. We apply the method to simulated and epidemiological datasets and show that it is both effective and consistent with other criteria in the literature.

Journal

Journal of the American Statistical AssociationTaylor & Francis

Published: Mar 1, 2000

Keywords: Data augmentation; File drawer problem; Funnel plot; Lung cancer; Meta-analysis; Missing studies; Passive smoking; Publication bias.

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