Exercise 2.11.2 Consider the model Y = X + Xb + e, E (e) = 0, Cov
Question:
Exercise 2.11.2 Consider the model Y = Xβ + Xb +
e, E
(e) = 0, Cov
(e) = σ2 I, where b is a known vector and Xb is often called an offset. Show that Proposition 2.1.3 is not valid for this model by producing a linear unbiased estimate of ρ
Xβ, say a0 + aY , for which a0 = 0.
Hint: Modify ρ
MY.
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