Question: Consider ARMA(1, 2) model X - aXt-1 = Et + Bet-2 where Ja < 1, 3E R, and & are i.i.d. random variables with

Consider ARMA(1, 2) model X - aXt-1 = Et + Bet-2 where

Consider ARMA(1, 2) model X - aXt-1 = Et + Bet-2 where Ja < 1, 3E R, and & are i.i.d. random variables with mean 0 and variance o?. (a) Write X in the form -0 TjEt-j (b) Use the result in (a) or otherwise to find y (1)

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