I have used the Time series and Forecasting system in sas to fit a model. I can see in the correlogram that the period is 12. But In the test of white noise of my errors, I have information... I can explain it. I would like to add to my model a "dummy variable" with top 0 or top 1 . My questions are : - where can I add a dummy variable in the application ? - How can I get the sas code of the model ?

Thanks a lot