Hi,
I am having the data of 60 months and trying to make it stationary by using ARIMA but i am unable as the data is quite scattered.I have followed the below mentioned process and codes...
PROC GPLOT DATA = Praveen.Projection;
PLOT margin*Month;
RUN;
DATA PRAVEEN.PROJECTION;SET PRAVEEN.PROJECTION;DROP DIF12_LOG_MARGIN;RUN;
/* make the data stationary*/
DATA PRAVEEN.PROJECTION;
SET PRAVEEN.PROJECTION;
LOG_MARGIN = LOG (MARGIN);
SQRT_MARGIN = MARGIN**0.5;
RUN;
/* TO CHECK DATA IS STATIONARY OR NOT BY USING DICKEY FULLER TEST*/
PROC ARIMA DATA = PRAVEEN.PROJECTION;
IDENTIFY VAR = LOG_MARGIN STATIONARITY = (ADF);
RUN:
DATA PRAVEEN.PROJECTION;
SET PRAVEEN.PROJECTION;
DIF_LOG_MARGIN = DIF(LOG_MARGIN);
RUN;