Want to limit donor pool to units from same state

[xuyiqing]

Want to limit donor pool to units from same state

[Mbjoerkh]

I apologize if this is an obvious question, but would really appreciate if someone has a chance to answer /make a suggestion (I'm new to R, so what is obvious to others might not be to me).

[michaeldgarber]

@Mbjoerkh This seems like more of a theoretical issue than a technical one. It seems OK to estimate the effect in each state by restricting analyses to those states. Whether you could then combine the effect estimates together might require additional assumptions of transportability or generalizeability of effects. As you may know, there is some literature on this, e.g., here: https://academic.oup.com/aje/article-abstract/188/2/438/5123986