*-
http://www.pinggu.org/bbs/thread-839332-1-1.html
sysuse auto, clear
reg price wei
est store m1
reg price wei len
est store m2
reg price wei len mpg foreign
est store m3
esttab m1 m2 m3 using mytab.rtf, replace ///
ar2 compress nogap wide ///
star(* 0.1 ** 0.05 *** 0.01) ///
b(%6.3f) brackets p ///
scalars(r2_a N F) ///
mtitle(Model1 Model2 Model3)
(PS: 这个问题已经超出了 stata 高级班的答疑范围,呵呵)