Thank you very much for all your tips! It works perfectly know and I begin to understand how R is working. I will now see how to construct this confident interval. Have a nice evening! -- View this message in context: http://r.789695.n4.nabble.com/access-the-se-of-a-forecast-tp4628847p4629088.html Sent from the R help mailing list archive at Nabble.com.