Question: The autocorrelation function (ACF) is essential in time series forecasting. (a) Discuss the difference between the autocorrelation function (ACF) and the cross-correlation function (CCF). (b)

The autocorrelation function (ACF) is essential in time series forecasting. (a) Discuss the difference between the autocorrelation function (ACF) and the cross-correlation function (CCF). (b) Describe the importance of the autocorrelation function (ACF) in time series forecasting.

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