Figure 10.13 contains ACF plots of 40 years of quarterly data, with all possible combinations of first-order

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Figure 10.13 contains ACF plots of 40 years of quarterly data, with all possible combinations of first-order seasonal and nonseasonal differencing. Which combination do you recommend in order to achieve stationarity?
Figure 10.13 contains ACF plots of 40 years of quarterly

Fig. 10.13. ACF plots of quarterly data with no differencing, nonseasonal differencing, seasonal differencing, and both seasonal and nonseasonal differencing.

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