Hi, This may be a stupid question, but why when creating an AR model, why does R set the first n components of the ar object's resid vector to NA (where n is the order of the model)? Regards, NC [[alternative HTML version deleted]]
Thanks all! On 09/09/2007, Nick Chorley <nick.chorley@gmail.com> wrote:> > Hi, > > This may be a stupid question, but why when creating an AR model, why does > R set the first n components of the ar object's resid vector to NA (where n > is the order of the model)? > > Regards, > > NC >[[alternative HTML version deleted]]