# Identifying unique id of a household in China 2000?

**URL:** <https://forum.ipums.org/t/identifying-unique-id-of-a-household-in-china-2000/2652>\
**Category:** General\
**Created:** [November 6, 2018, 1:43pm UTC](https://forum.ipums.org/t/identifying-unique-id-of-a-household-in-china-2000/2652 "2018-11-06T13:43:00Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![cherish569](https://avatars.discourse-cdn.com/v4/letter/c/e5b9ba/32.png) [@cherish569](https://forum.ipums.org/u/cherish569)\
**Post date:** [November 6, 2018, 1:43pm UTC](https://forum.ipums.org/t/identifying-unique-id-of-a-household-in-china-2000/2652/1 "2018-11-06T13:43:00Z")

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I am using the data sample of China 2000,I want to know if I create a variable X which concatenates ‘CN2000A\_DWNUM’ and ‘CN2000A\_HHNUM’, does X mean a unique id of a household?

For example,‘CN2000A\_DWNUM’=‘1’,‘CN2000A\_HHNUM’=‘1’,X=‘11’.

Thanks.

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**Author:** ![JeffBloem](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.ipums.org/jeffbloem/32/40_2.png) [@JeffBloem](https://forum.ipums.org/u/JeffBloem)\
**Post date:** [November 6, 2018, 3:54pm UTC](https://forum.ipums.org/t/identifying-unique-id-of-a-household-in-china-2000/2652/2 "2018-11-06T15:54:00Z")

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Yes, you are correct. However, there is a pre-made within-sample unique household ID variable ([SERIAL](https://international.ipums.org/international-action/variables/SERIAL#codes_section)) that performs the same task and is available for the China 2000 sample file.

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**Author:** ![cherish569](https://avatars.discourse-cdn.com/v4/letter/c/e5b9ba/32.png) [@cherish569](https://forum.ipums.org/u/cherish569)\
**Post date:** [November 7, 2018, 2:05am UTC](https://forum.ipums.org/t/identifying-unique-id-of-a-household-in-china-2000/2652/3 "2018-11-07T02:05:00Z")

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Thanks a lot.