Results either agreed completely or fell within a margin of error expected when using numerical methods. Results were also compared with those provided by SAS using the proc mixed command (for more details, see van Houwelingen, Arends, & Stijnen, 2002), by SPSS using the macros developed by David Wilson (Lipsey & Wilson, 2001), by the meta (CRAN Link) and rmeta (CRAN Link) packages in R, and by Comprehensive Meta-Analysis, MetaWin, and the Review Manager of the Cochrane Collaboration. In particular, results have been compared with those provided by the metan, metareg, metabias, and metatrim commands in Stata (for more details on these commands, see Sterne, 2009). First of all, when corresponding analyses could be carried out, I have compared the results provided by the metafor package with those obtained with other software packages for several data sets. ![]() Various attempts have been made to validate the functions in the metafor package.
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