模型运算结果如下，请问如何从得出模型的最终表达式，以便在论文里书面写出。

. arima close,arima(1,1,1)

ARIMA regression

Sample:  03jan1960 - 17nov1971                  Number of obs      =      4337
                                                Wald chi2(2)       =    466.07
Log likelihood =  -22020.6                      Prob > chi2        =    0.0000

------------------------------------------------------------------------------
             |                 OPG
     D.close |      Coef.   Std. Err.      z    P>|z|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
close        |
       _cons |   .4137306   .6000733     0.69   0.491    -.7623913    1.589853
-------------+----------------------------------------------------------------
ARMA         |
          ar |
         L1. |  -.7853223    .064201   -12.23   0.000    -.9111538   -.6594907
          ma |
         L1. |   .8127667   .0608304    13.36   0.000     .6935412    .9319922
-------------+----------------------------------------------------------------
      /sigma |   38.80075   .1011949   383.43   0.000     38.60242    38.99909
------------------------------------------------------------------------------