drop x1 x2
gen x1=uniform()
gen x2=.
replace x2=0 if x1>0.7
replace x2=1 if x1<=0.7
roccomp outcome betatotal, by(x2)

如题，想把上面的这套语句循环运行1000次，并且保存roccomp每一次运行时的r(p)
想请教大神怎么做到啊
谢谢大家