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316 Chapter 8 State-Space Models<br />

a. Show that the observation equation with state variable transformed by the<br />

logit transformation Wt ln(Xt/(1 − Xt)) follows an exponential family<br />

p(yt|wt) exp{ytwt − b(wt) + c(yt)}.<br />

Determine the functions b(·) and c(·).<br />

b. Suppose that the state Xt has the beta density<br />

where<br />

p(xt+1|y (t) ) f(xt+1; αt+1|t,λt+1|t),<br />

f(x; α, λ) [B(α, λ)] −1 x α−1 (1 − x) λ−1 , 0

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