I am trying to match ipums-cps monthly files from 1989 and 2010. The main problem is that for march files the identifiers hrhhid and HRHHID2 does not exist in ipums march files.
OK, I can collect the original identifiers from the NBER-cps march supplement files , but still I have a big problem. The NBER supplements have the identifiers hrhhid and HRHHID2 only for years 2005 to 2010. How can I deal with this problem for years 1989-2004?
I would really apreciate your help