The CoordinateFree Approach to GaussMarkov Estimation (Lecture Notes in Economics and Mathematical Systems, 40),Used

The CoordinateFree Approach to GaussMarkov Estimation (Lecture Notes in Economics and Mathematical Systems, 40),Used

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These notes originate from a couple of lectures which were given in the Econometric Workshop of the Center for Operations Research and Econometrics (CORE) at the Catholic University of Louvain. The participants of the seminars were recommended to read the first four chapters of Seber's book [40], but the exposition of the material went beyond Seber's exposition, if it seemed necessary. Coordinatefree methods are not new in GaussMarkov estimation, besides Seber the work of Kolmogorov [11], SCheffe [36], Kruskal [21], [22] and Malinvaud [25], [26] should be mentioned. Malinvaud's approach however is a little different from that of the other authors, because his optimality criterion is based on the ellipsoid of c centration. This criterion is however equivalent to the usual c cept of minimal covariancematrix and therefore the result must be the same in both cases. While the usual theory gives no indication how small the covariancematrix can be made before the optimal es timator is computed, Malinvaud can show how small the ellipsoid of concentration can be made: it is at most equal to the intersection of the ellipssoid of concentration of the observed random vector and the linear space in which the (unknown) expectation value of the observed random vector is lying. This exposition is based on the observation, that in regression ~nalysis and related fields two conclusions are or should preferably be applied repeatedly.

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