Table of Contents
International Scholarly Research Notices
Volume 2014, Article ID 825383, 17 pages
http://dx.doi.org/10.1155/2014/825383
Research Article

Publication Bias in Meta-Analysis: Confidence Intervals for Rosenthal’s Fail-Safe Number

1Department of Economics, Mathematics and Statistics, Birkbeck, University of London, Malet Street, London WC1E 7HX, UK
2Division of Medicine, University College London, Rockefeller Building, 21 University Street, London WC1E 6JJ, UK
3College of Engineering and Technology, American University of the Middle East, Egaila, Kuwait
4Department of Business Administration, Technological Educational Institute (T.E.I.) of Athens, 122 43 Athens, Greece

Received 23 June 2014; Revised 5 October 2014; Accepted 20 October 2014; Published 3 December 2014

Academic Editor: Giuseppe Biondi-Zoccai

Copyright © 2014 Konstantinos C. Fragkos et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The purpose of the present paper is to assess the efficacy of confidence intervals for Rosenthal’s fail-safe number. Although Rosenthal’s estimator is highly used by researchers, its statistical properties are largely unexplored. First of all, we developed statistical theory which allowed us to produce confidence intervals for Rosenthal’s fail-safe number. This was produced by discerning whether the number of studies analysed in a meta-analysis is fixed or random. Each case produces different variance estimators. For a given number of studies and a given distribution, we provided five variance estimators. Confidence intervals are examined with a normal approximation and a nonparametric bootstrap. The accuracy of the different confidence interval estimates was then tested by methods of simulation under different distributional assumptions. The half normal distribution variance estimator has the best probability coverage. Finally, we provide a table of lower confidence intervals for Rosenthal’s estimator.