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10.1 Transfer Function Models 339<br />

In terms of the original sales data {Yt2} we have Y149,2 262.7 and<br />

Yt2 Yt−1,2 + Xt2 + .420.<br />

Hence the predictors of actual sales are<br />

P ∗<br />

150Y151,2 262.70 − .228 + .420 262.89,<br />

P ∗<br />

150Y152,2 262.89 + .923 + .420 264.23,<br />

where P ∗ 149 is based on {1,Y11,Y12,Xs1,Xs2, −∞

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