I need help in interpreting AR(2) model which is of a form y=phi2(t-2)+e... I can't get past the fact that phi1 is missing -does it mean that phi1 = 0? why would that be a case? Thank you all in advance! -- View this message in context: http://n4.nabble.com/Please-help-with-AR-2-tp947912p947912.html Sent from the R help mailing list archive at Nabble.com.