This method adds one or more formula branches to
an existing `mverse`

object. Formula branches
are used to specify model structure options for the analysis.

```
add_formula_branch(.mverse, ...)
# S3 method for mverse
add_formula_branch(.mverse, ...)
```

- .mverse
a

`mverse`

object.- ...
`formula_branch`

objects.

The resulting `mverse`

object.

Other formula branch functions:
`formula_branch()`

```
# Define a formula branch.
model_specifications <- formula_branch(
y ~ femininity,
y ~ femininity + hurricane_strength,
y ~ femininity * hurricane_strength
)
# Create a mverse, add the branch.
mv <- create_multiverse(hurricane) %>%
add_formula_branch(model_specifications)
```