Hi!
I am trying to run JWDID with not yet treated as controls, and at the same time have pretreatment coefficients for parallel trend assumption.
I first calculate IPWs using, e.g. for treated cohorts 2014, the units in cohorts [2015,2025]. Cohorts [2023,2025] are recoded as never treated and they only function as control cohorts. Then, I try to use JWDID, but if I use the 'never' option, cohorts [2023,2025] are the only controls used, while if I remove it I cannot have pretreatment coefficients as the command assumes that parallel trends hold. Considered that I have a count variable on the left hand side (patent count), that the treatment is staggered, and that I would like to use the ppmlhdfe, what are my options? Maybe toremove 'never' and do an ad-hoc event study on the side to complement it?
Thank you and have a nice day.
Salvo
I am trying to run JWDID with not yet treated as controls, and at the same time have pretreatment coefficients for parallel trend assumption.
I first calculate IPWs using, e.g. for treated cohorts 2014, the units in cohorts [2015,2025]. Cohorts [2023,2025] are recoded as never treated and they only function as control cohorts. Then, I try to use JWDID, but if I use the 'never' option, cohorts [2023,2025] are the only controls used, while if I remove it I cannot have pretreatment coefficients as the command assumes that parallel trends hold. Considered that I have a count variable on the left hand side (patent count), that the treatment is staggered, and that I would like to use the ppmlhdfe, what are my options? Maybe toremove 'never' and do an ad-hoc event study on the side to complement it?
Thank you and have a nice day.
Salvo
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