Hi, I want to predict using airma, but I want to predict using t-2 or t-3, instead of t-1 right now the arima() function doesn't allow me to do that, it will alwasy return with variable t-1 , what is the way to skip that variable? thanks ®ards -- View this message in context: http://r.789695.n4.nabble.com/arima-forecast-without-the-first-order-of-auto-regressor-tp4643412.html Sent from the R help mailing list archive at Nabble.com.