The analysis at (advertising time) is incorrect, you need to group by order ids as well, otherwise orders with many different products in them have more "weight" than ones with single products. Also, perhaps not use count and instead use order value so they can be weighted by amount, since more expensive orders are more valuable for the business.(01:00:00 - 01:26:07)
Solving real world data science tasks with Python Pandas!
Keith Galli
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