The average treatment effect on the treated (ATT) measures the impact of a treatment or intervention specifically on those individuals who received the treatment. It is a crucial concept in causal inference as it helps estimate how effective a treatment is among participants, as opposed to the entire population. This measure is particularly relevant when considering the heterogeneity of treatment effects and is often assessed using methods like inverse probability weighting.
congrats on reading the definition of Average Treatment Effect on the Treated. now let's actually learn it.