OPTION  LINESIZE=80;
DATA IBM;
        N=_N_;
	INFILE IBMCP;
	INPUT PRICE @@;
		DPRICE=DIF(PRICE);
		D5PRICE=DIF5(PRICE);           
		D12PRICE=DIF12(PRICE);
PROC ARIMA;
	IDENTIFY VAR=PRICE(1);
        IDENTIFY VAR=PRICE(12);
        IDENTIFY VAR=PRICE(5);
* PROC STANDARD WILL CONVERT YOUR SERIES TO STANDARDIZED Z VALUES, THIS LETS ;
* YOU DETERMINE IF OUTLIERS HAVE BEEN CREATED BECAUSE OF DIFFERENCING ETC.   ;
PROC STANDARD MEAN=0 STD=1;
	VAR PRICE DPRICE D5PRICE D12PRICE;
PROC TIMEPLOT;
	PLOT PRICE='*';
        ID N; 
PROC TIMEPLOT;
	PLOT DPRICE='D';
        ID N;