cap mkdir D:\EM\
cap mkdir D:\EM\FS\
cnstock all, path("D:\EM\")
drop if index(stknm,"Ｂ") | index(stknm,"B")
levelsof stkcd , local(stk)
foreach i in `stk'{
cnar `i', path("D:\EM\FS\")
disp "`i'"
}



请问为何到了foreach循环这一步出来的结果总是no observations？