Question

Which of the following is equal to the average treatment effect (E(Y1i − Y0i)) when Di...

Which of the following is equal to the average treatment effect (E(Y1i − Y0i)) when Di is randomly assigned?

(a) E(Yi | Di = 1) − E(Yi | Di = 0)

(b) E(Y1i | Di = 1) − E(Y1i | Di = 0)

(c) E(Y0i | Di = 1) − E(Y0i | Di = 0)

(d) all of the above

i know the answer is A, but could someone explain why?

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