# DAG: Directed acyclic graphs (DAGs) In phylopath: Perform Phylogenetic Path Analysis

## Description

This function is a simple wrapper around the function from the `ggm` package with the same name. The only differences are that the `order` argument defaults to `TRUE` and that it adds a `DAG` class for easy plotting. Typically, one would use `define_model_set()` to create models for use with the `phylopath` package.

## Usage

 `1` ```DAG(..., order = TRUE) ```

## Arguments

 `...` a sequence of model formulae `order` logical, defaulting to `TRUE`. If `TRUE` the nodes of the DAG are permuted according to the topological order. If `FALSE` the nodes are in the order they first appear in the model formulae (from left to right). For use in the `phylopath` package, this should always be kept to `TRUE`, but the argument is available to avoid potential problems with masking the function from other packages.

## Details

Supply a formulas for the model as arguments. Formulas should be of the form `child ~ parent`` and describe each path in your model. Multiple children of a single parent can be combined into a single formula: `child ~ parent1 + parent2`. Finally, an isolate (unconnected variable) can be included as being connected to itself: `isolate ~ isolate'.

## Value

An object of classes `matrix` and `DAG`

## Examples

 ```1 2 3 4 5 6``` ``` # Use formula notation to create DAGs: plot(DAG(A~B, B~C)) # Use + to easily add multiple parents to a node: plot(DAG(A~B+C)) # Add a node as it's own parent to create an isolate: plot(DAG(A~B+C, D~D)) ```

### Example output

```
```

phylopath documentation built on Oct. 5, 2021, 1:06 a.m.