Question: Take the first differences between the observations in the time series from X9.1. Would you say that the differenced time series is stationary? If it

Take the first differences between the observations in the time series from X9.1. Would you say that the differenced time series is stationary? If it is not what would you do to make it stationary?

Exercises 9.1

Chart the time series given in Table 9.1 and decide if it is stationary and or seasonal.

X y Table 9.1 1 2 2 5 3 6 st 4 6 5 4 6 5 7 7 8 5 9 8 10 9

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