Question: Estimate the following ARIMA model in full, first using Backshift notation and then subscript notation: ARIMA(1,0,1)(2,1,0)[12]. Coefficients: ar1 = 0.9 ma1 = -0.7 sar1 =

Estimate the following ARIMA model in full, first using Backshift notation and then subscript notation: ARIMA(1,0,1)(2,1,0)[12]. Coefficients: ar1 = 0.9 ma1 = -0.7 sar1 = -0.6 sar2 = -0.3 sigma^2 = 0....

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