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3.3 Forecasting ARMA Processes 107<br />

and<br />

Zn+h Xn+h +<br />

∞<br />

πjXn+h−j, (3.3.16)<br />

j1<br />

where {ψj} and {πj} are uniquely determined by equations (3.1.7) and (3.1.8), respectively.<br />

Let ˜PnY denote the best (i.e., minimum mean squared error) approximation to<br />

Y that is a linear combination or limit of linear combinations of Xt, −∞

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