preserve
tsset year
local vars "GDP inv_p emp_t"
foreach var of varlist `vars'{
gen ln`var'=ln(`var')
gen dln`var'=D.ln`var'
local a=4
local b=1
   forvalues i=1(1)`a'{
     forvalues j=0(1)`b'{
           if `j'==0{
           local ma`var' ""
           }
           else{
           local ma`var' "ma(1/`j')"
           }
         local y`var' "dln`var' ln`var' `var'"
         qui arima `y`var'', ar(1/`i') `ma`var''
         est store arma`i'`j'`var'
         qui estat ic
         }
   }
local mm`var' arma10`var' arma11`var' arma20`var' arma21`var' arma30`var' arma31`var'
esttab `mm`var'' ,mtitle(`mm`var'') compress nogap scalar(11 aic bic)
}
restore
输出了这个：（第一行是绿色，第二行是红色）
(1 missing value generated)
11 invalid name