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Causal path

As explained in Causal Inference for Data Science

A causal path is a directed path through a causal graph whose edges consistently point from a source variable to a destination variable and represent a route of causal influence.

A causal path is a route through a directed acyclic graph from X to Y whose arrows consistently point forward: X → Z1 → … → Y. It represents one way changing X can causally change Y. A path such as X ← Z → Y is not causal because changing X does not change Z along that route. section 6.1.2 section 6.4

Topic, platform, and pageviews

Suppose topic affects pageviews directly, or affects the platform that then affects pageviews. The platform is a mediator when estimating topic's effect on pageviews, but becomes the treatment when comparing platforms. These roles determine which causal paths and effects matter. section 6.1.2

Correlation can travel through both causal and noncausal paths. The pipe-network analogy treats variables as nodes and correlation as gas: conditioning on a confounder can close a path such as X ← Z → Y, leaving the causal route X → Y. In a graph, confounders, mediators, and colliders therefore require different adjustment decisions. section 6.2.1

Use path structure to interpret effects and linear calculations:

  • Trace only forward-directed paths when identifying causal effects from X to Y. section 6.1.2
  • For standardized linear graphs, multiply coefficients along each relevant path; total effects combine directed causal paths, while correlations may also include noncausal paths without colliders. section 6.2.3
  • Choose regression controls only after distinguishing confounders, mediators, and colliders and deciding whether the target is a direct, indirect, or total effect. section 6.4

How Causal Inference for Data Science covers it

How deep it goes
Explains graph structure, confounding, mediation, colliders, path coefficients, and regression implications, while deferring complex-graph path control.
Examples
Uses topic-pageviews diagrams, X-Y-Z three-node graphs, kidney-stone roles, clinical-trial side effects, and coefficient-path calculations.
What it assumes
Assumes familiarity with causal graphs, arrows, correlation, and regression while distinguishing confounders, mediators, and colliders explicitly.
What you can do after
Evaluate causal diagrams, trace influence routes, distinguish causal from noncausal paths, and select regression controls for a stated effect.
How it connects
Connects directed acyclic graphs, causal effects, correlation, confounders, mediators, colliders, conditioning, and linear regression.

Related concepts

This explainer was generated by Manning's knowledge graph from the text of Causal Inference for Data Science. The section links point to the parts of the book it draws on.