We can include "old demand data" data source in the forecasting process while creating a time series–based forecast for the amount of soda to be sold in the cafeteria in the next week.
What is Data Source?
A data source can be the initial location where data is created or where physical information is first digitized, but even the most refined data can serve as a source if another process accesses and uses it. A database, a flat file, live measurements from physical devices, scraped web data, or any of the numerous static and streaming data services available on the internet are all examples of data sources.
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