我还试过local
. local i=1
. while 'i'<=1000{
2. foreach{
3. clear
4. set obs 1000
5. gen ut=rnormal(0,1)
6. gen b0=7
7. gen b1=56
8. gen b2=11
9. gen x1t=rnormal(1,2)
10. gen x2t=runiform(10,100)
11. gen yt=7+56*x1t+11*x2t+ut
12.
. }
13. reg yt x1t x2t
14. local i='i'+1
15. }
'i' invalid name
r(198);