Holt-Winters Forecasting for Many Products and Departments
I have a term project on forecasting the data that I have. The problem that I'm facing is my data consists of many departments and products and I need to forecast them separately. The tutorial of holt-winters can help me if I have only one product to forecast. But since my data has many sales departments and each of them has many products it's extremely time-consuming for me to forecast them one by one.
How can I forecast a product of each sales department in one model?
My data looks like this:
Month Sales Department Product Sales Quantity
Jan A 1 10
Jan B 1 20
Feb A 2 20
Feb B 2 10
Have a nice one!