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COMBINE: Stata module to combine n, mean, and SD from two groups according to the Cochrane-recommended formula for meta-analyses


  • Philip M Jones

    () (University of Western Ontario)


combine is meant to be used by analysts performing meta-analysis whereupon it is sometimes necessary to combine size, mean, and SD from two groups (for example, two intervention groups). The Cochrane Collaboration provides a formula for this calculation in its handbook, but it is cumbersome to perform using a calculator, or by hand.

Suggested Citation

  • Philip M Jones, 2011. "COMBINE: Stata module to combine n, mean, and SD from two groups according to the Cochrane-recommended formula for meta-analyses," Statistical Software Components S457265, Boston College Department of Economics, revised 21 Dec 2017.
  • Handle: RePEc:boc:bocode:s457265 Note: This module should be installed from within Stata by typing "ssc install combine". Windows users should not attempt to download these files with a web browser.

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    meta-analysis; combine;


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