The ARMA(1, 1) model is fitted to the time series of streamflow at a station with parameters

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The ARMA(1, 1) model is fitted to the time series of streamflow at a station with parameters ϕ1(1) = −0.6 and θ1 = −0.4. Plot the autocorrelation functions of the time series from lags 1 to 5.

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