Let a be an n 1 nonrandom vector and let u be an n 1
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Let a be an n × 1 nonrandom vector and let u be an n × 1 random vector with E(uu’) = In. Show that E(tr (auu‘a’)] = Σni=1α2i.
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Theorem Let X be a random vector with n elements Then its covariance matrix CX is positi...View the full answer
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Introductory Econometrics A Modern Approach
ISBN: 9781337558860
7th Edition
Authors: Jeffrey Wooldridge
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