Extract the Model Coefficients and Coefficient Table from 'rma' and 'summary.rma' Objects

Function to extract the estimated model coefficients from objects of class "rma". For objects of class "summary.rma", the model coefficients, corresponding standard errors, test statistics, p-values, and confidence interval bounds are extracted.

# S3 method for class 'rma'
coef(object, ...)
# S3 method for class 'summary.rma'
coef(object, ...)

Arguments

object

an object of class "rma" or "summary.rma".

...

other arguments.

Value

Either a vector with the estimated model coefficient(s) or a data frame with the following elements:

estimate

estimated model coefficient(s).

se

corresponding standard error(s).

zval

corresponding test statistic(s).

pval

corresponding p-value(s).

ci.lb

corresponding lower bound of the confidence interval(s).

ci.ub

corresponding upper bound of the confidence interval(s).

When the model was fitted with test="t", test="knha", test="hksj", or test="adhoc", then zval is called tval in the data frame that is returned by the function.

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.mh, rma.peto, rma.glmm, and rma.mv for functions to fit models for which model coefficients/tables can be extracted.

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 model coefficients
coef(res)
#>      intrcpt        ablat         year 
#> -3.545505079 -0.028011275  0.001907557 

### extract model coefficient table
coef(summary(res))
#>             estimate          se       zval        pval        ci.lb        ci.ub
#> intrcpt -3.545505079 29.09587983 -0.1218559 0.903013130 -60.57238164 53.481371479
#> ablat   -0.028011275  0.01023404 -2.7370689 0.006198931  -0.04806963 -0.007952924
#> year     0.001907557  0.01468382  0.1299088 0.896638598  -0.02687219  0.030687307