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METABIAS: Stata module to test for small-study effects in meta-analysis


Author Info

  • Robert M Harbord


  • Ross J Harris


  • Jonathan AC Sterne


  • Thomas Steichen



metabias performs several statistical tests for funnel-plot asymmetry in meta-analysis and optionally plots associated graphs. As there are several possible sources of funnel-plot asymmetry, these tests assess evidence for small-study effects in general rather than publication bias specifically. This is version 2.1 of the program. In addition to the tests available in previous versions of the program, namely the rank correlation test proposed by Begg and Mazumdar and the regression test proposed by Egger et al., this version also includes the modified regression test proposed by Harbord et al. and the modification of Macaskill's test proposed by Peters et al. The previous version of the program (sbe19.5) is included as -metabias6-.

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Bibliographic Info

Software component provided by Boston College Department of Economics in its series Statistical Software Components with number S404901.

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Programming language: Stata
Requires: Stata version 9.2 and the metan package (6.0 for metabias6)
Date of creation: 16 Feb 2000
Date of revision: 08 Jan 2009
Handle: RePEc:boc:bocode:s404901

Note: This module may be installed from within Stata by typing "ssc install metabias". Windows users should not attempt to download these files with a web browser.
Contact details of provider:
Postal: Boston College, 140 Commonwealth Avenue, Chestnut Hill MA 02467 USA
Phone: 617-552-3670
Fax: +1-617-552-2308
Web page:
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Related research

Keywords: meta-analysis; publication bias; small-study effects; funnel plot;


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