What are the potential reasons that cause the large difference between the ATE and ATT in PSM? My guess may be that the observables of treatment group and the population are very different?
Besides, how to know if it is balanced well or not?
I am attaching my results in this post. Much appreciate your help:))
Treatment Effect Estimates: Matching
Est. S.e. z P>|z| [95% Conf. int.]