The function extracts model formulae for objects of class "rma".

# S3 method for rma
formula(x, type="mods", ...)

Arguments

x

an object of class "rma".

type

the formula which should be returned; either "mods" (default), "yi" (in case argument yi was used to specify a formula), or "scale" (only for location-scale models).

...

other arguments.

Value

The requested formula.

Author

Wolfgang Viechtbauer wvb@metafor-project.org http://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

### copy BCG vaccine data into 'dat' dat <- dat.bcg ### calculate log risk ratios and corresponding sampling variances dat <- escalc(measure="RR", ai=tpos, bi=tneg, ci=cpos, di=cneg, data=dat, slab=paste(author, ", ", year, sep="")) ### mixed-effects meta-regression model res <- rma(yi, vi, mods = ~ ablat + alloc, data=dat) formula(res, type="mods")
#> ~ablat + alloc #> <environment: 0xa1e5578>
### specify moderators via 'yi' argument res <- rma(yi ~ ablat + alloc, vi, data=dat) formula(res, type="yi")
#> yi ~ ablat + alloc #> <environment: 0x990fd38>