Question: 2. Partition the series into training and validation, so that the last 4 years are in the validation period for each series. What is the

2. Partition the series into training and validation, so that the last 4 years are in the validation period for each series. What is the logic of such a partitioning? What is the disadvantage? 3. Generate naive forecasts for all series for the validation period. For each series, create forecasts with horizons of 1,2,3, and 4 years ahead ( , and )

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