程序如下：
sysuse nlsw88, clear
tab race, gen(d_race)
drop d_race1
tab occu, gen(d_occu)
drop d_occu1
reg wage hours ttl_exp married
est store m1
reg wage hours ttl_exp married d_race*
est store m2
reg wage hours
est store m3
outreg2 [m1 m2 m3] using tab01, seeout replace
会显示：file tab01.txt could not be opened

不知道是什么原因，用logout、esttab等命令也会出现这样的情况，请指教，谢谢。