For the zero-inflated Poisson (ZIP) model in Section 18.4.8, we derived the conditional mean function, E[y i
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For the zero-inflated Poisson (ZIP) model in Section 18.4.8, we derived the conditional mean function, E[yi |xi, wi] = (1 − Fi)λi.
a. For the same model, now obtain Var[yi |xi, wi]. Then, obtain τi = Var[yi |xi, wi]/E[yi |xi, wi]. Does the zero inflation produce overdispersion? (That is, is the ratio greater than one?)
b. Obtain the partial effect for a variable zi that appears in both wi and xi.
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