Add video/screenshot guide for creating graph in DAGitty and importing into DoWhy

[amit-sharma]

It is possible to create a graph using the DAGitty GUI, export the graph text file and import it directly in DoWhy.

It will be nice to add a demo of this functionality in the user-guide, in the model.rst file.

[github-actions]

🤖 This is an automated response from Repo Assist.

Great idea, @amit-sharma! A quick walkthrough of the DAGitty → DoWhy pipeline would lower the barrier for users coming from a DAGitty background.

What the guide should cover

1. Design your DAG in the [DAGitty GUI]((dagitty.net/redacted)
2. Export to DAGitty text format (the .dag / adjacency list format from "Model code" panel).
3. Convert to a DOT string or networkx graph. DoWhy's CausalModel accepts:
   • A graph keyword with a DOT string
   • A networkx.DiGraph object
4. Verify the imported graph with model.view_model().

Implementation note

DoWhy can parse DOT format directly. A small helper that reads DAGitty's export format and emits valid DOT would complete the bridge. The logic would mostly be string manipulation since DAGitty uses X -> Y [exposure] style syntax.

How to contribute

This would be a great first contribution — it's primarily documentation (docs/source/user_guide/effect_inference/model.rst) with a short code snippet. If you're interested, see CONTRIBUTING.md to get started.

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