In an ARIMA(2, 1, 1) process, which equation represents the differenced time series? O a. Y...
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In an ARIMA(2, 1, 1) process, which equation represents the differenced time series? O a. Y  Y₁1 = μ+₁Y₁1 +0₁E₁1 + Et O b. Y  Y₁1= μ+₁(Y₁1  Y₁2) +01+ t O c. Y₁Y₁1=+₁(Y₁1  Yt2) +0₁ (Yt2  Yt3) + Et O d. Y  Y₁1 = μ + $₁Y₁1 + 0₁(Yt1  Yt2) + In an ARIMA(2, 1, 1) process, which equation represents the differenced time series? O a. Y  Y₁1 = μ+₁Y₁1 +0₁E₁1 + Et O b. Y  Y₁1= μ+₁(Y₁1  Y₁2) +01+ t O c. Y₁Y₁1=+₁(Y₁1  Yt2) +0₁ (Yt2  Yt3) + Et O d. Y  Y₁1 = μ + $₁Y₁1 + 0₁(Yt1  Yt2) +
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