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those are the "internally" created variables. They are used to create the event-like study estimates. and to identify the effectively treated observations. You do not need to interpret them.
by default, if you use "never" as control group, results will be similar to long2
And, if you have pre-trend problems, there is no way to avoid them. they simply exist
I also met the varlist required error after running estat event. I replaced the .ado files of the jwdid package with the two .ado files (jwdid.ado and jwdid_estat.ado) downloaded from FernandoRios 's website. https://friosavila.github.io/playing...ain_jwdid.html
The issue was solved. I installed my stata packages in D:\stata\ado\plus. By default, the packages can be in C:\....stata\ado\plus.
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