# Matching 1% IPUMS Sample to Full Count census

**URL:** <https://forum.ipums.org/t/matching-1-ipums-sample-to-full-count-census/1525>\
**Category:** USA\
**Created:** [December 19, 2016, 5:38pm UTC](https://forum.ipums.org/t/matching-1-ipums-sample-to-full-count-census/1525 "2016-12-19T17:38:00Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![anyosae](https://avatars.discourse-cdn.com/v4/letter/a/c6cbf5/32.png) [@anyosae](https://forum.ipums.org/u/anyosae)\
**Post date:** [December 19, 2016, 5:38pm UTC](https://forum.ipums.org/t/matching-1-ipums-sample-to-full-count-census/1525/1 "2016-12-19T17:38:00Z")

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Dear Joe,

I have access to the full count version of the 1930 Census of IPUMS through NBER servers. I am trying to match the 1% sample of the 1930 census that is obtained from the website to the full count census using household and serial identifiers, but this is not working. I was wondering if you could provide some insight on how to match these two datasets.

Best,

Antony

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**Author:** ![grover](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.ipums.org/grover/32/5_2.png) [@grover](https://forum.ipums.org/u/grover)\
**Post date:** [December 21, 2016, 5:49pm UTC](https://forum.ipums.org/t/matching-1-ipums-sample-to-full-count-census/1525/2 "2016-12-21T17:49:00Z")

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[SERIAL](https://usa.ipums.org/usa-action/variables/SERIAL#description_section) and [PERNUM](https://usa.ipums.org/usa-action/variables/PERNUM#description_section) are only meant to uniquely identify individuals within a given sample. To link between the full count 1930 file from NBER and the 1930 1% sample I would recommend using REEL, MICROSEQ, PAGENO, and LINE, available in the IPUMS-USA [Household-\>Historical Technical](https://usa.ipums.org/usa-action/variables/group?id=h-hist_tech) variable group. The IPUMS-USA 1930 samples also include NAMEFRST and NAMELAST (in the [Person-\>Historical Technical](https://usa.ipums.org/usa-action/variables/group?id=hist_tech) variables group) which should be useful for verifying or making matches as well. These variables should allow you to match almost all of the cases from the 1930 1% file

I hope this helps.