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Question 4 xx' Let x be nx1 matrix whose j-th element is x). Show that A== and B 1-A are x'x symmetric idempotent matrices.
Question 4 xx' Let x be nx1 matrix whose j-th element is x). Show that A== and B 1-A are x'x symmetric idempotent matrices. Hint: Note that x'x is a scalar (real number).
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To address this problem we need to show that the matrices A x x x x A x x x x and B I n A B I n A ar...
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Foundations of Macroeconomics
Authors: Robin Bade, Michael Parkin
6th edition
132831007, 978-0132831000
