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If a series is integrated of order 2, then the most appropriate model to be estimated is an AR(2) O the most appropriate model to

"If a series is integrated of order 2, then" the most appropriate model to be estimated is an AR(2) O "the most appropriate model to estimate is an ARIMA(2,2,2)" O The variable is characterized by a model with a quadratic deterministic trend O the series has to be differenced two times in order to yield a stationary time series

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