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data day_index;
input index;t=_n_;
dif_index=dif(index);
cards;
£¨Êý¾Ý²¿·Ö£©
;
proc gplot;
        plot index*t;   
        symbol i=joint v=none;
run;
proc gplot;
        plot dif_index*t;
        symbol i=jiont v=none;
run;
proc arima;
        identify var=index;
run;
proc arima;
        identify var=dif_index nlag=10;
        estimate p=1 method=cls;
        forecast lead=5 id=t out=results;
run;
proc gplot data=results;
        plot dif_index*t=1 results*t=2 l95*t=3 u95*t=3/overlay;
        symbol1 c=red i=none v=star;
        symbol2 c=red i=joint v=none l=1 w=1;
        symbol3 c=green i=joint v=none l=2 w=2;
run;
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