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I have more than 100 stores; and there is a lot of store level and MSA level macro economic information. I need to forecast sales for each store for the next 1 year. And I just have SAS 9 (so no Proc Panel).
Been reading on Proc Mixed and Proc Tscsreg. Can anyone please guide me on which technique/procedure will be more appropriate and why? Any case study I can look up?
Also, which is a better approach? Forcast sales at the weekly level and derive the monthly sales? Or, forecast sales at the monthly level and derive the weekly sales?