3.8 Verify the calculations for the autocorrelation function of an ARMA(1, 1) process Compare the form with that of the ACF for the ARMA(1,0) and the ARMA(0, 1) series. Plot (or sketch) the ACFs of the three series on the same graph for = .6, 0.9, and comment on the diagnostic capabilities of the ACF in this case.

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