This function is primarily an internal helper function in `jtools`

and
related packages to standardize the different types of formula objects used
by different types of models.

## Usage

```
get_formula(model, ...)
# S3 method for default
get_formula(model, ...)
# S3 method for brmsfit
get_formula(model, resp = NULL, dpar = NULL, ...)
# S3 method for panelmodel
get_formula(model, ...)
```

## Arguments

- model
The fitted model object.

- ...
Ignored.

- resp
For

`brmsfit`

objects, the response variable for which the formula is desired.`brmsfit`

objects may have multiple formulas, so this selects a particular one. If`NULL`

, the first formula is chosen (unless`dpar`

is specified).- dpar
For

`brmsfit`

objects, the distributional variable for which the formula is desired. If`NULL`

, no distributional parameter is used. If there are multiple responses with distributional parameters, then`resp`

should be specified or else the first formula will be used by default.