Question: Consider the single equation model Yi = Xi + ei where Yi and Xi are both real-valued (1 1). Assume E(Ziei) = 0, E(ZiXi) =

Consider the single equation model Yi = Xi + ei where Yi and Xi are both real-valued (1 1). Assume E(Ziei) = 0, E(ZiXi) = qzx, E(Z2 i ) = qzz , E(e2 i |Zi) = 2. And all the second and fourth moments of Yi, Xi, Zi are finite. Suppose we have a random sample with iid observations

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