*
* Example TABLE6-4.DAT from page 213
*
open data table6-4.dat
data(format=free,org=columns) 1 36 time data
*
diff(sdiffs=1,span=12) data / datad12
stats datad12
set seasfit * 37 = data{12}+%mean
set seaserr = data-seasfit
print(picture="*.##") / data datad12 seasfit seaserr
*
* The UForeErrors procedure analyzes a set of forecast errors. The syntax is
* @uforeerrors actual forecasts
*
@UForeErrors data seasfit