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Has active professional certification or license

Codes and Frequencies

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PROFCERT indicates whether the respondent has a professional certification or state or industry license. Business licenses are not included.


In 2015, this question was asked to respondents 16 and over in every interview (MIS 1-8). Beginning in 2016, these questions are asked only in the first and fifth interview (MIS 1 and 5).
This variable is comparable across available samples.


  • Respondents age 16+.


Years Jan Feb ASEC Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2015 – 2021 X X - X X X X X X X X X X
2022 X X - X X X X X X X X - -



Unharmonized Variables