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The metafor Package: A Meta-Analysis Package for R

The metafor package is a free and open-source add-on for conducting meta-analyses with the statistical software R. The package consists of a collection of functions that allow the user to calculate various effect size or outcome measures, fit fixed-, random-, and mixed-effects models to such data, carry out moderator and meta-regression analyses, and create various types of meta-analytical plots.

Detailed information about the metafor package can be found on the package website.

MiMa: An S-Plus/R Function to Fit Meta-Analytic Models

The mima function was a function to fit meta-analytic mixed-, random-, and fixed-effects models. This function is now obsolete and has been removed from this website. The metafor package (see above) provides a much more comprehensive set of functions for conducting meta-analyses with R.

Approximate Confidence Intervals for Standardized Effect Sizes

Iterative methods are usually needed to obtain exact confidence interval bounds for standardized effect sizes (i.e., there are no closed-form solutions for the bounds). In a paper, I examined a variety of closed-form approximations to the exact confidence interval bounds for the standardized mean difference (i.e., Cohen's d) in the two-independent and two-dependent samples design. I wrote up a concise summary of the methods that were found to be most accurate in the paper.

Current Version: 1.0