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The following plots have been obtained for a time series. a) Suggest an appropriate ARIMA model. (2 marks). 120 - 90 - 60 - 30

The following plots have been obtained for a time series.

a) Suggest an appropriate ARIMA model. (2 marks).

120 - 90 - 60 - 30 - 1980 Jan 1990 Jan 2000 Jan 2010 Jan 2020 Jan Month 0.2 - 0.2 - 0.1 -- act pact 0.0 0.0 -0.1 - - - - - = -0.1 - - - - - - - -1 12 18 24 12 18 24 lag [1M] lag [1M]

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