I have a panel data which consists of the sales of different companies across different years. Can someone tell me what kinds of regressiona and ML methods we use for forecasting the sales?
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Sales data is Time-series data. You should use the method of Time-series forecasting.
Below is a list of useful links to start with -
This is a good book to grasp the concepts -
Forecasting: Principles and Practice
Also, do check this similar question.