------------------ copy up to and including the previous line ------------------

Listed 100 out of 98558 observations

. gen post =0

. replace post =1 if date >=eventdate
(98,558 real changes made)

.
end of do-file
双重差分分析生成post ，将date 大于等于eventdate的post设为1，否则为0。求大神指教以下指令有什么问题，为什么全部post都变为1呢？
gen post =0

. replace post =1 if date >=eventdate