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Somewhere in between. A simple question I use is "how do I decide whether to add a feature to a classification model?" Most candidate are fine until I bring up the topic of correlated features.

Are you hiring for finance? In Europe it still depends very much on the industry: some mean coding, some maths, some infrastructure, all want data preparation and in-depth stats. edit: other than understanding the business fundamentals, of course.

Do you mean like non-orthogonal dimensions?

That's terrible.

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