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a. Stationarity means that the time series initially has an upward trend, but later this changes to a downward trend. Ob. error terms are not

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a. Stationarity means that the time series initially has an upward trend, but later this changes to a downward trend. Ob. error terms are not correlated. c. forecasts remain within 1.96 standard deviations outside the sample period. d. probability distribution of the time series variable does not change over time

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