Springer Texts in Business and Economics
Best Linear Prediction. This is based on Amemiya (1994)
a. The mean squared error predictor is given by MSE = E(Y — a — "X)2 = E(Y2) + a2 + "2E(X2) — 2aE(Y) — 2"E(XY) + 2a"E(X) minimizing this
MSE with respect to a and " yields the following first-order conditions:
7.1 Invariance of the fitted values and residuals to non-singular transformations of the independent variables. The regression model in (7.1) can be written as y = XCC-1" + u where …
8.1 Since H = PX is idempotent, it is positive semi-definite with b0H b > 0 for any arbitrary vector b. Specifically, for b0 = (1,0,.., 0/ we get hn …
9.1 GLS Is More Efficient than OLS. a. Equation (7.5) of Chap. 7 gives "ois = " + (X'X)-1X'u so that E("ois) = " as long as X and u …