Add Polygons to Forest Plots

Description

The function addpoly is generic. It can be used to add polygons to a forest plot, for example, to indicate summary estimates for all or subgroups of studies and to indicate fitted/predicted values based on models involving moderators.

Usage

addpoly(x, ...)

Arguments

Details

Currently, methods exist for two types of situations.

In the first case, object x is a fitted model coming from the rma.uni, rma.mh, rma.peto, or rma.glmm functions. The model must either be a fixed- or random-effects model, that is, the model should not contain any moderators. The corresponding method is called addpoly.rma. It can be used to add a polygon to an existing forest plot (often at the bottom), showing the summary estimate with corresponding confidence interval based on the fitted model.

Alternatively, object x can be a vector with values at which one or more polygons should be drawn. The corresponding method is then addpoly.default.

Author(s)

Wolfgang Viechtbauer wvb@metafor-project.org
package website: http://www.metafor-project.org/
author homepage: http://www.wvbauer.com/

References

Viechtbauer, W. (2010). Conducting meta-analyses in R with the metafor package. Journal of Statistical Software, 36(3), 1–48. http://www.jstatsoft.org/v36/i03/.

See Also

addpoly.rma, addpoly.default, forest.rma, forest.default