Trend and Seasonal Analysis
/*--------------------------------------------------------------
SAS Sample Library
Name: tseex02.sas
Description: Example program from SAS/ETS User's Guide,
The TIMESERIES Procedure
Title: Trend and Seasonal Analysis
Product: SAS/ETS Software
Keys: time-stamped transactional data
PROC: TIMESERIES
Notes:
--------------------------------------------------------------*/
proc timeseries data=sashelp.air
out=series
outtrend=trend
outseason=season print=seasons;
id date interval=qtr accumulate=avg;
var air;
run;
title1 "Trend Statistics";
proc sgplot data=trend;
series x=date y=max / lineattrs=(pattern=solid);
series x=date y=mean / lineattrs=(pattern=solid);
series x=date y=min / lineattrs=(pattern=solid);
yaxis display=(nolabel);
format date year4.;
run;
title1 "Trend Statistics for 2nd Season";
proc sgplot data=trend;
where _season_ = 2;
vbar date / freq=sum;
format date year4.;
yaxis label='Sum';
run;
data trend;
set trend;
year = year(date);
run;
title1 "Trend Statistics by Year";
proc sgplot data=trend;
series x=_season_ y=mean / group=year lineattrs=(pattern=solid);
xaxis values=(1 to 4 by 1);
run;
title1 "Seasonal Statistics";
proc sgplot data=season;
series x=_season_ y=max / lineattrs=(pattern=solid);
series x=_season_ y=mean / lineattrs=(pattern=solid);
series x=_season_ y=min / lineattrs=(pattern=solid);
yaxis display=(nolabel);
xaxis values=(1 to 4 by 1);
run;