How is each IPUMS-USA record uniquely identified?

#1

How is each IPUMS-USA record uniquely identified?

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#2

Three variables constitute a unique identifier for each household record in the IPUMS: YEAR, DATANUM, and SERIAL (year, data set number, and household serial number).

Four variables constitute a unique identifier for each person record in the IPUMS: YEAR, DATANUM, SERIAL, and PERNUM (year, data set number, household serial number, and person number).

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