序列的单位根检验程序和一阶差分后序列的单位根检验程序

Proc arima data=example1_1;

identify var=Y stationarity=(adf=1);

Run;

data example1_1;input Y;difY=dif(Y);t=_n_;cards;proc gplot;plot Y * t difY * t;symbol c=black v=none i=join;Proc arima data=example1_1;identify var=Y stationarity=(adf=1);Run;
请大神帮忙修改一下