/* airline_whitenoise.sas */ TITLE1 'Tests for white noise'; TITLE2 'for the trend und seasonal'; TITLE3 'adjusted Airline Data'; /* Read in the data and compute log-transformation as well as seasonal and trend adjusted data */ DATA data1; INFILE 'c:\data\airline.txt'; INPUT num @@; dlognum=DIF12(DIF(LOG(num))); /* Compute periodogram and test for white noise */ PROC SPECTRA DATA=data1 P WHITETEST OUT=data2; VAR dlognum; RUN; QUIT;