gen NDA=_b_cons+_b_A1*A1+_b_RVC*RVC+_b_PPE1*PPE
A1 not found
跑到最后那个操纵性盈余管理指标计算那里,之前一直没有任何问题
突然显示A1不存在,这是为什么?
在之前那一步跑完后,显示
statsby,by(year ind) clear:reg TA A1 RVC PPE1
(running regress on estimation sample)
command: regress TA A1 RVC PPE1
by: year ind
Statsby groups
----+--- 1 ---+--- 2 ---+--- 3 ---+--- 4 ---+--- 5
x..x...xxx.x.xxx..x.......x...x...x....xx.xx..xx.. 50
...x.x....xx...x..........x.xx...x...x..x.x....x.. 100
...x....x.......x.x...x...x..x.....x.....x........ 150
.x..x....x...x..x.....x........x.......x.......x.. 200
.x..x..............x.......x....x...x..x
我在br看过命令也是没有问题的!求解!!!


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