do文件
eventstudy2 stockid date using security_returns, ret(sreturn) evwlb(-10) evwub(10) ///
model(FM) marketfile(marketfile) mar(mreturn) car1LB(-10) car1UB(10) ///
car2LB(-3) car2UB(3) ///
car3LB(-1) car3UB(1) ///
car4LB(-2) car4UB(2) ///
car5LB(-5) car5UB(5) ///
car6LB(-1) car6UB(10) ///
car7LB(-4) car7UB(4) ///
car8LB(-4) car8UB(10) ///
car9LB(-8) car9UB(8) ///
car10LB(-1) car10UB(5) ///
eswlb(-110) eswub(-11) arfillevent replace


运行原来的数据是可以跑得，我把我的数据照着原来的一模一样的改了以后就是弹出variable date does not uniquely identify observations in the using data是为啥，感谢大神解答了！！！