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What does it mean to "narrow down postal codes"


applicant15

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I'm trying to find household data by looking at census tracts, but my prof said there is too many postal codes and need to narrow those down. How do I know which postal code is important or not? Do I just group postal codes that are in one area as category A, then another group as category B, and so on to differentiate the regions? Will also be using SPSS.

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