terms.mixmeta: Extract Model Terms from mixmeta Objects
In gasparrini/mixmeta: An Extended Mixed-Effects Framework for Meta-Analysis

Description Usage Arguments Details Value Author(s) See Also Examples

These method function returns the terms object that defines meta-analytical models represented in objects of class "mixmeta".

1 2	## S3 method for class 'mixmeta' terms(x, type="fixed", ...)

`x`	an object of class `"mixmeta"`.
`type`	the type of terms. Either `"fixed"` or `"full"`. See Details.
`...`	further arguments passed to or from other methods.

The terms object is produced by mixmeta when fitting the meta-analytical model, and stored as an attribute of the model.frame. Note that this object consists of terms for both the fixed and random-effects parts, the latter including also the grouping factors.

By using the default type="fixed", this method function removes the random-effects terms. This can then be used, for instance, for creating the model.matrix for the fixed effects. Otherwise with type="full", the full set of terms is returned.

An object of class c("terms","formula") which contains the terms representation of a symbolic meta-analytical model. See terms.object for its structure.

Antonio Gasparrini <antonio.gasparrini@lshtm.ac.uk>

See the methods model.frame and model.matrix.

# RUN A MODEL
model <- mixmeta(effect, var, random= ~ 1|district/study, data=school)

# TERMS (FIXED AND FULL)
terms(model)
terms(model, "full")
attr(model.frame(model), "terms")