The function extracts the model matrix for objects of class "rma".

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

Arguments

object

an object of class "rma".

...

other arguments.

Value

The model matrix.

Author

Wolfgang Viechtbauer wvb@metafor-project.org 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

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)
#> intrcpt ablat year #> 1 1 44 1948 #> 2 1 55 1949 #> 3 1 42 1960 #> 4 1 52 1977 #> 5 1 13 1973 #> 6 1 44 1953 #> 7 1 19 1973 #> 8 1 13 1980 #> 9 1 27 1968 #> 10 1 42 1961 #> 11 1 18 1974 #> 12 1 33 1969 #> 13 1 33 1976