Question: For the Poisson GLMM (13.14), use the normal mgf to show that for t s, cov(Y it , Y is ) = exp[(x it

For the Poisson GLMM (13.14), use the normal mgf to show that for t ≠ s,

cov(Yit, Yis) = exp[(x’it + x’is)β][exp(σ2)(exp(σ2)–1)]

Hence, find corr(Yit, Yis).

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