Question: Consider the null model ????i = ???? when the observations are independent counts. Of the Poisson-model-based and robust estimators of the variance of ???? =

Consider the null model ????i = ???? when the observations are independent counts.

Of the Poisson-model-based and robust estimators of the variance of ????̂ = ȳ

presented in Section 8.3.3, which would you expect to be better

(a) if the Poisson model truly holds,

(b) if there is severe overdispersion? Explain your reasoning.

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