Question: Rewrite the following time series models using the backshift B operator and the difference operator in terms of the time series zt. a) = 1

Rewrite the following time series models using the backshift B operator and the difference operator in terms of the time series zt. a) = 1 + + 0.5 1 b) = 2 1 + c) = 1 + 1 where = 1 d) = 3 1 + 2 2

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