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Very slight differences in the results, but not sure why and I think they are immaterial.
Spoiler
Process:
- Calculate monthly average and annual average
- Join monthly average and annual average with original data
- Replace null monthly averages with annual average
- Replace null weekly averages with monthly average
- ARIMA tool with weekly target frequency on weekly units
- TS Predict weekly to 6 periods
- Calculate monthly average and annual average
- Join monthly average and annual average with original data
- Replace null monthly averages with annual average
- Replace null weekly averages with monthly average
- ARIMA tool with weekly target frequency on weekly units
- TS Predict weekly to 6 periods
