Define appropriate quantities for descriptive modeling.
Choose relevant quantities for a model
Problem
Determine the quantities needed to predict the total cost of buying notebooks from this list: number of notebooks, price per notebook, notebook color, store music volume.
Big Picture
What this problem is really about
Start with the relationship that produces the requested outcome, then identify which contextual quantities fill its inputs. A useful relevance test is to imagine changing one detail while holding the others fixed: if that change has no stated effect on the model’s output, the detail does not belong in the model.
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