Simple statistical methods or algorithms for item recommendation & item quantity prediction

[hot kestrel]

I** want to build a model to recommend food items to buy for a particular day and the quantity to be purchased. I track consumption history of items by day of week and person, as well as inventory**. Are there any **specific algorithms I can use? **I need to implement these algorithms from scratch so a statistical concept would be preferred over a library

food consumption history is map of weekdays 'monday, tuesday, …' to a 2d List containing lists of item name and quantity on consumed.

[surreal schooner]

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