metatrim implements the Duval and Tweedie nonparametric "trim and fill" method of accounting for publication bias in meta-analysis. Selective publication of studies, which may lead to bias in estimating the overall meta-analytic effect and in the inferences derived, is of concern when performing a meta-analysis. If publication bias appears to exist, then it is desirable to consider what the unbiased dataset might look like and then to reestimate the overall meta-analytic effect after any apparently "missing" studies are included. Duval and Tweedie's "nonparametric 'trim and fill' method" is an approach designed to meet these objectives. metatrim requires that program meta (Sharpe and Sterne, STB-38 and STB-42) be installed. This is version 1.0.5 of the software. This version has been modified to run correctly under Stata Version 7 and later (though it remains a version 6 program) and has two new options, mixed and flip. mixed requests that the meta-analyses during iterations be different from those of the initial and final meta-analyses. flip is a switch that changes the direction in which studies are assumed to be suppressed by publication bias. Use of this option would be appropriate, for example, where a beneficial treatment reduces the odds or risk of death.
Download Info
To download:
If you experience problems downloading a file, check if you have the
proper application to
view it first. Information about this may be contained
in the File-Format links below. In case of further problems read
the IDEAS help
file. Note that these files are not on the IDEAS
site. Please be patient as the files may be large.
Publisher Info
Software component provided by Boston College Department of Economics in its series Statistical Software Components with number
S410501.
Size: Programming language: Stata Requires: Stata version 6.0 (8.0 for dialog) Date of creation: 17 Mar 2000 Date of revision:
09 Apr 2004 Handle: RePEc:boc:bocode:s410501
Note: This module may be installed from within Stata by typing "ssc install metatrim". 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 Email: Web page: http://fmwww.bc.edu/EC/ More information through EDIRC