DΘstinyじò 发表于 2021-5-13 22:18 
针对以上各种条件,结合给出示例,尝试以下代码(实际按需修改):
非常感谢您的回答!但我在运行代码的过程中遇到了“command gen wanted is unrecognized”的报错,请教您该如何解决?
. gen temp=multi
.
. bys stkcd (year): replace temp=. if multi[_n]==multi[_n-1]
(11,721 real changes made, 11,721 to missing)
.
. bys stkcd (year): egen temp1=count(temp)
.
. bys stkcd (year): gen wanted="一直是0" if temp1==1&multi[1]==0
command gen wanted is unrecognized
r(199);