proc gplot data=sasuser.lfy;
plot y*year=1;
symbol1 v=star c=black i=jion;
run;
proc autoreg data=sasuser.lfy;
model y=year /nlag=5 backstep method=ml ;
output out=out predict=xp p=xp pm=trend;
proc gplot data=out;
plot y*year=2 xp*year=3 trend*year=4/overlay;
symbol2 v=star c=black i=nnone;
symbol3 v=none c=red i=jion;
symbol4 v=none c=green i=jion;
run;
我想预测未来5期的值，求高手指点，在哪些程序？怎么写？