8.8 Colliders

A variable is a collider on a particular path if, on that path, both arrows point at it.

• A path is closed by default if a collider sits on it
• The path opens up if the collider is controlled for

Because once you control for the collider, the two variables pointing to the collider become related.

We can avoid colliders by

• not controlling for them
• not choosing a sample where the collider is automatically controlled for