处理组虚拟变量为treated。
时间虚拟变量设置为:
- gen after = (date >= td(01feb2021))
- encode ticker_f, generate(ticker_f2)
- encode created_day, generate(created_day2)
- xtset ticker_f2 created_day2
- xtreg y i.after##i.treated i.created_day2, fe vce(robust)
--------------+----------------------------------------------------------------
1.after | -32.94548 6.969544 -4.73 0.000 -46.65085 -19.2401
1.treated | 0 (omitted)
|
after#treated |
1 1 | -8.712043 4.413733 -1.97 0.049 -17.3915 -.0325843