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The triple differences design was first introduced by Gruber (1994) in a study of state-level policies providing maternity benefits. He uses as his treatment group married women of childbearing age in treatment and control states, but he also uses a set of placebo units (older women and single men 20–40) as within-state controls. He then goes through the differences in means to get the difference-in-differences for each set of groups, after which he calculates the DDD as the difference between these two difference-in-differences.

 

이거 적용해볼 수 있을까요?

 

인천광역시의 "1억 플러스 아이드림" 출산정책이 출산률에 미친 영향에 대한 분석에  Difference-in-differences (혹은 triple differences) technique을 적용해 볼 수 있을까요?

 

Gruber, Jonathan. 1994. “The Incidence of Mandated Maternity Benefits.” American Economic Review 84 (3): 622–41.