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Codes and Frequencies

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SEX gives each person's sex.


In some Basic Monthly samples between 1976 and 1988, there are several household head/wife of head couples that are of the same sex in the input data. In these instances, IPUMS allocates SEX such that heads of household are male and wives of household heads are female, as the CPS allocates either sex or marital status and relationship to head variables in later years to disallow same-sex couples in the data. These records have a QSEX value of 12 and amount to only 84 cases.

Comparability with IPUMS-USA

This variable is fully comparable with the SEX variable in IPUMS-USA.


  • 1962-1967 (ASEC): Persons age 14+ (pre-1968 samples do not include persons under age 14).
  • 1968+ (ASEC): All persons.
  • 1976+ (non-ASEC): All persons.


Years Jan Feb ASEC Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1962 – 1975 - - X - - - - - - - - - -
1976 – 2023 X X X X X X X X X X X X X
2024 X X - X X X X - - - - - -



Unharmonized Variables