Phone numbers,Social Security numbers,and zip codes are typically treated as numerical variables.

Name: Phone numbers,Social Security numbers,and zip codes are typically treated as numerical variables.
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Phone numbers, Social Security numbers, and zip codes are typically treated as categorical variables because they are used to categorize or identify individual items or people, and their numerical operations (addition, subtraction, etc.) do not have any meaningful interpretation.

Phone Numbers,Social Security Numbers,and Zip Codes Are Typically Treated as Numerical