[Marry Lee]

Search 'generalized DID' Clyde Schechter answeredsuch a question many times.

[Saharnaz Babaei]

Hello, Thank you for this thread and all your responses. How could this analysis be done for a case where there is variation in time of treatment? I need to estimate a DiD using a pooled data (4 waves of a survey - different individuals in each survey). Policy occurs at different times at different states. Observations are at teacher level. How can I do a pre-trend test?

So, the answer to my question is

jwdid

by FernandoRios
https://friosavila.github.io/playing...ain_jwdid.html
where I can run DD for a repeated cross sectional data, nonlinear logit model, staggered treatment.