EXTFUNNEL: Stata module to produce graphical augmentations to the funnel plot to indicate the potential impact of a new study on an existing meta-analysis

Michael J. Crowther ()
Additional contact information
Michael J. Crowther: Karolinska Institutet

Statistical Software Components from Boston College Department of Economics

Abstract: extfunnel creates graphical overlay augmentations to the funnel plot. The purpose of these overlays is to display the potential impact a new study would have on an existing meta-analysis, providing an indication of the robustness of the meta-analysis to the addition of new evidence. Thus, these extend the use of the funnel plot beyond assessments of publication biases. Two main graphical displays can be produced; i) statistical significance contours, which define regions of the funnel plot in which a new study would have to be located in order to change the statistical significance of the meta-analysis; and ii) heterogeneity contours, which show how a new study would affect the extent of heterogeneity in a given meta-analysis. extfunnel can also illustrate the impact a new study has on lower and upper confidence interval values, the confidence interval width of the pooled meta-analytic result, and overlays for the impact of a future study on, user defined, limits of clinical equivalence. Inverse variance weighted methods are implemented using both explicit formulae for contour lines, and a simulation approach optimised in Mata.

Language: Stata
Requires: Stata version 11
Keywords: funnel plot; meta-analysis; publication bias (search for similar items in EconPapers)
Date: 2011-08-21, Revised 2012-07-09
Note: This module should be installed from within Stata by typing "ssc install extfunnel". The module is made available under terms of the GPL v3 (https://www.gnu.org/licenses/gpl-3.0.txt). Windows users should not attempt to download these files with a web browser.
References: Add references at CitEc
Citations:

Downloads: (external link)
http://fmwww.bc.edu/repec/bocode/e/extfunnel.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/e/extfunnel.sthlp help file (text/plain)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:boc:bocode:s457316

Ordering information: This software item can be ordered from
http://repec.org/docs/ssc.php

Access Statistics for this software item

More software in Statistical Software Components from Boston College Department of Economics Boston College, 140 Commonwealth Avenue, Chestnut Hill MA 02467 USA. Contact information at EDIRC.
Bibliographic data for series maintained by Christopher F Baum ().