I have a SARIMA (2,1,0) x (0,1,2)12 (seasonal period of 12). I currently have (1 - alpha1(B) - alpha2(B))*Wt (the differencing term of Xt) = (1 + beta1(B)^12 + beta2(B)^12))*Zt. I think I have the non season AR(2) differenced once right but I am not sure what to do about the right side of the equation. I think I have the MA(2)12 component right but how would I write Zt difference once.
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Does this help: https://stats.stackexchange.com/questions/90476/arima-sarima-model-mathematical-formula ? – Dayne Feb 16 '22 at 04:49