Research Synthesis Methods

Cross‐hairs: a scatterplot for meta‐analysis in R

Journal Article

We describe a meta‐analytic scatterplot that indicates precision of points for two variables paired within studies; this is equivalent in form to a ‘cross‐hairs’ plot used to portray specificity and sensitivity in diagnostic testing. At the user's discretion, the plot also displays boxplots for each of the X and Y variable distributions, means for each of the variables, and the correlation between the two. The cross‐hairs may be suppressed for dense point clouds. The program is written in R, so it can be modified by the user and can serve as a companion to existing meta‐analysis programs. Some of the program's novel uses are described and illustrated with (1) independent effect sizes, (2) dependent effect sizes, and (3) shrunken estimates. Copyright © 2016 John Wiley & Sons, Ltd.

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