Purpose: How to calculate the ZCTA radius within a ZCTA? Background: I have two groups of nodes: from and to. The two groups may locate in the same ZCTA (25%) but most of them had different ZCTAs (75%). I managed to calculate the ZCTAs distance for the 75%, centroid to centroid. But I don't know how to assign a distance to the other 25%. I expect to use ZCTA radius as a proxy for that purpose. Can anyone help me with it? Thank you in advance! BTW, 5-digit zip code is the only available geographic info.
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