Will the result still be valid if some units are untreated, treated, and then untreated again?

[jluo41]

The ordinary policy pattern is being untreated, and then treated (that is D = [0,0,0, ..., 1,1,1...].

What if the policy pattern is being untreated, treated, and then untreated? That is the D = [0,0,0,0, ..., 1,1,1, ..., 0,0,0 ...]. Will the result still be valid? Can the result still be interpreted in the previous way?

Thanks,

Junjie

[xuyiqing]

Yes, it will be valid, as long as you are willing to accept the assumption that the treatment only has contemporaneous effects (as in two-way fixed effects).

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On Fri, Jun 12, 2020 at 2:23 AM floydluo ***@***.***> wrote: The ordinary policy pattern is being untreated, and then treated (that is D = [0,0,0, ..., 1,1,1...]. What if the policy pattern is being untreated, treated, and then untreated? That is the D = [0,0,0,0, ..., 1,1,1, ..., 0,0,0 ...]. Will the result still be valid? Can the result still be interpreted in the previous way? Thanks, Junjie — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#2>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AB2PKGG4N6FHRBR7STQBBFTRWHXYXANCNFSM4N4FBL6A> .

-- Yiqing Xu Assistant Professor Department of Political Science Stanford University http://yiqingxu.org/

[jluo41]

Great! Thanks for your reply.