So I am looking to match the CPS data with data from the EPA’s Envirofacts data. The CPS data has an industry variable with census codes while the EPA data has an industry variable with NAICS codes. I am using CPS data from 1990 to 2016.
The CPS Ind variable is 3 digit from 1990 until 2003 after which it becomes 4 digit. I am struggling to find a crosswalk between the census and NAICS codes that can encompass this change.
Can anyone tell me which version of the census codes the IND variable is based on between 1990 and 2016? I don’t know if the census codes are of the 2000 version or the 1990 version.
Also, does anyone have a crosswalk between census code and NAICS that could be used in this situation?