[Gretl-users] Re: ARMAX prediction/fitted values function ESTIMATES

Humour me please. Let us suppose we have an ARMAX(1,0,0) model with 2 independent variables and a constant. ie  (1-ΦB)Yt = α +µ1*X1t +µ2*X2t where B is the lag or backshift operator Assuming Φ is positive this is equivalent to *Yt =α + Φ*Yt-1 +µ1*X1t +µ2*X2t*   which is relatively straightforward to check against Gretl output  using the estimated coefficients and relevant rhs variables .However, the results of doing so do not correspond to the predicted or fitted values  from Gretl.