workfile trend-stacionarne u 1 100
series e = 0
series z = 0


rndseed 1123456789

' geska e je Gausov beli sum sa varijansom jedan i sredinom nula'
series e = nrnd

' greska z je ARMA (1,1)' 
smpl 2 100
 z=0.8*z(-1) + e + 0.5*e(-1)
  
' 4 varijante trend-stacionarnih modela' 

smpl 2 100
series ts1=-2.5+0.1*@trend+e
series ts2=-2.5+0.1*@trend+z
series ts3=3-0.04*@trend + e
series ts4=3-0.04*@trend+z