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304 Chapter 8 State-Space Models<br />

As mentioned earlier, the parameters αt|t−1 and λt|t−1 can be quite arbitrary: Any<br />

nonnegative functions of y (t−1) will lead to a consistent specification of the state<br />

densities. One convenient choice is to link these parameters with the corresponding<br />

parameters of the posterior distribution at time t − 1 through the relations<br />

<br />

λt+1|t δλt δ(1 + λt|t−1) , (8.8.41)<br />

<br />

αt+1|t δαt δ(yt + αt|t−1) , (8.8.42)<br />

where 0

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