data seriesG;
set sashelp.air;
logair = log(air);
run;
ods html style=statistical;
ods graphics on;
proc ucm data = seriesG;
id date interval = month;
model logair;
irregular;
level;
slope var = 0 noest;
season length = 12 type=trig plot=smooth;
estimate back=24 plot=(acf loess);
forecast back=12 lead=24 plot=forecasts;
run;
ods graphics off;
ods html close;