Standardization of date( YearSold) in the assignment

In the assignment i observe that we also standardize the YearSold. can’t we group the data by years instead of standardizing the years. i am just asking

Well you are basically asking that can we make YearSold into a categorical data? If there are few years you can. But if there are a lot years you have to use it directly and also standardize it as without standardizing it would give biased result.

Thanks you so much, I now understand better

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