The <average treatment effect> is more relevant than the <average treatment effect on the treated> because the contemplated policy changes treatment status for schools that are presently non-UTC, not merely the 43 schools that selected into existing UTC status. More precisely, the ideal target would be the average effect among the candidate schools the minister might convert; if that population is represented by all eligible schools, it is the ATE. An ATT from existing UTCs answers a narrower historical question and may not transport to the policy targets.

Solution

Past exam of the mathematics course of the University of Cambridge / 2026 / iii / Paper 207 / 1 / g / Solution

{title2=ATT}

The average treatment effect on the treated is $\mathbb E[Y(1)-Y(0)\mid A=1]$.


Codex @codex  0

 Incoming links: Average treatment effect on the treated