model.matrix.rma: Extract the Model Matrix from 'rma' Objects

In metafor: Meta-Analysis Package for R

Extract the Model Matrix from 'rma' Objects

Description

Function to extract the model matrix from objects of class "rma".

Usage

## S3 method for class 'rma'
model.matrix(object, asdf, ...)

Arguments

object	an object of class "rma".
asdf	logical to specify whether the model matrix should be turned into a data frame (the default is FALSE).
...	other arguments.

Value

The model matrix.

Author(s)

Wolfgang Viechtbauer [e-mail] https://www.metafor-project.org

References

Viechtbauer, W. (2010). Conducting meta-analyses in R with the metafor package. Journal of Statistical Software, 36(3), 1–48. ⁠https://doi.org/10.18637/jss.v036.i03⁠

See Also

rma.uni, rma.glmm, and rma.mv for functions to fit models for which a model matrix can be extracted.

fitted for a function to extract the fitted values.

Examples

### calculate log risk ratios and corresponding sampling variances
dat <- escalc(measure="RR", ai=tpos, bi=tneg, ci=cpos, di=cneg, data=dat.bcg)

### fit mixed-effects model with absolute latitude and publication year as moderators
res <- rma(yi, vi, mods = ~ ablat + year, data=dat)

### extract the model matrix
model.matrix(res)

metafor documentation built on May 29, 2024, 7:44 a.m.