In the case of Seasonal ARIMA modeling, the differencing, autoregressive, and moving average operators are the product of seasonal and nonseasonal polynomials:
where s is the number of periods in a season. The first index on the coefficients is the factor number (1 indicates nonseasonal, 2 indicates seasonal) and the second is the lag of the term.
The Seasonal ARIMA dialog appears when you select the Seasonal ARIMA command. It has the same elements as the ARIMA dialog and adds elements for specifying the seasonal autoregressive order (P), seasonal differencing order (D), and seasonal moving average order (Q). Also, the Periods Per Season box lets you specify the number of periods per season (s). The seasonal ARIMA models are denoted as Seasonal ARIMA(p,d,q)(P,D,Q)s.