2TIME SERIES ANALYSIS6¿=−1À1 + 1À+ 17, 6À=1¶1 + 1À¹1 + 1À+ 17.So, the desired best linear estimate is−1À1 + 1À+ 17°¿+1¶1 + 1À¹1 + 1À+ 17°À.(b)Write the best linear estimate as³¿°7+ ³À°8. Then,³¿and³Àare determined byĽ¶0¹½¶1¹½¶1¹½¶0¹Å "³¿³À# = Ľ¶1¹½¶2¹Å.Similar to the arguments in part (a), we obtain³¿=1¶1 + 1À¹1 + 1À+ 17, ³À=−1À1 + 1À+ 17.So, the desired best linear estimate is1¶1 + 1À¹1 + 1À+ 17°7−1À1 + 1À+ 17°8.(c)Write the best linear estimate as6Àare
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