Hi Scott, I tried the code you posted here. I am wondering why the standard deviation(SD) of the estimate from the manual code is different from that using “did2s” command. How could we possibly change the manual code to get the same SD as that using package “did2s”? Could you help with this question. Thank you so much!

Thank you for this fascinating break-down and discussion! I'd like to ask about "reversible treatment" mentioned at the end of the interview. What estimator should I choose if I have multiple time periods, differential treatment timing and reversible treatment? In my particular case, I also have no never-treated units. I'd be grateful for any advice you can given.

Hi Scott, I tried the code you posted here. I am wondering why the standard deviation(SD) of the estimate from the manual code is different from that using “did2s” command. How could we possibly change the manual code to get the same SD as that using package “did2s”? Could you help with this question. Thank you so much!

Thank you for this fascinating break-down and discussion! I'd like to ask about "reversible treatment" mentioned at the end of the interview. What estimator should I choose if I have multiple time periods, differential treatment timing and reversible treatment? In my particular case, I also have no never-treated units. I'd be grateful for any advice you can given.