DAG and identification

Yangyong Ye

DAG

• Displays assumptions about the relationship between variables (nodes).

• The assumptions take the form of lines (edges) going from one node to another.

• Directed edges means that they have a single arrowhead indicating their effect.

• No assumptions on functional form or variable distribution.

bi-direction

bi-direction = confounder

acyclic

mediation

confounder

collider

collider

collider, control or not control

collider, control or not control

descendant of colliders

mediation

complicated

parents

ancestors

descendants

path

adjustment set

collider bias

adjustment