average treatment effect on the treated.

The average causal effect among treated units, comparing their observed outcome with the outcome those same units would have had untreated.

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Words that belong together

• average treatment effect on the treated
• ATT estimate
• effect among treated units

On the page

Using matched controls, analysts estimated the average treatment effect on the treated.

Usage notes

The ATT targets the treated population; it need not equal the population average treatment effect when effects vary.