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Household ID long (part 1), use when matching across files, 1977-1995


UH_HHID_A2 is a 12-digit numeric variable.


Household ID long (part 1), use when matching across files - 1977-1995

Unicon Corporation made the following notes about this variable:
Beginning in 1994 through the current year, there is a problem with duplicate HHIDs for different household units. The problem is particularly severe starting with the SCHIP- expanded sample in 2001 (the 2001S data). See Appendix S for further discussion. When identifying a household within a file, the variable hhseq should be used. This variable appears to have no problem with duplicate values. However, when matching records across files, it is necessary to use HHID. Adding geographic variables to the sort (state, cntyfp) may aid in uniquely identifying household units. When that is not enough, we suggest that household units be identified by using both hhid and hhseq, then use demographic variables (sex, age, race) to match up individuals within the household, thus insuring that the proper hhid / hhseq units are matched across years.

In 1994 and 1995 there appear to be duplicate famnum's within household id. The Census response (10/98) to this matter follows: 'There is a problem with the household id's in 1994 and 1995 in that there is not enough detail present in the 12 digit number. This number must be concatenated with the census state code to make these numbers more unique.' Use _hhid.

In 1994, this variable on the tape release was incorrect. The corrected values were released on-line. Unicon has merged the new values onto this file. The corrected hhid is found here. The original value is found in the variable hhid94.


UH_HHID_A2 is comparable across all available samples.


  • All household records.


Years Jan Feb ASEC Apr May Jun Jul Aug Sep Oct Nov Dec
1988 – 1993 - - X - - - - - - - - -
1995 - - X - - - - - - - - -


This variable has no flags.