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Average treatment effect on the control

As explained in Causal Inference for Data Science

The average treatment effect on the control is the average causal effect among units that received the control condition.

The average treatment effect on the control (ATC) is the average causal effect among units that received the control condition. In propensity-score analyses, interpret it only where treated and control cases are comparable; without overlap, causal effects cannot be safely calculated. section 5.3.3

Partial overlap among patients

Suppose treated and control patients overlap only for propensity scores from 0.25 to 0.75. Restricting analysis to this common-support region avoids unsupported comparisons, but the resulting effect cannot be extrapolated to excluded patients. section 5.3.3

How Causal Inference for Data Science covers it

How deep it goes
Explains overlap, common-support restriction, and non-extrapolation, but does not detail an ATC estimator.
Examples
Uses patient groups and propensity-score distributions showing no overlap, full overlap, partial overlap, and treated-only overlap.
What it assumes
Assumes treated and control groups, propensity scores, matching, and the positivity assumption.
What you can do after
Evaluate whether propensity-score overlap supports a causal-effect analysis without extrapolating beyond comparable patients.
How it connects
Connects propensity scores with positivity, matching, average treatment effects, and average treatment effect on the treated.

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.