# 1870 samples independent?

**URL:** <https://forum.ipums.org/t/1870-samples-independent/2190>\
**Category:** USA\
**Created:** [March 2, 2018, 1:18am UTC](https://forum.ipums.org/t/1870-samples-independent/2190 "2018-03-02T01:18:00Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![william.collins](https://avatars.discourse-cdn.com/v4/letter/w/e56c9b/32.png) [@william.collins](https://forum.ipums.org/u/william.collins)\
**Post date:** [March 2, 2018, 1:18am UTC](https://forum.ipums.org/t/1870-samples-independent/2190/1 "2018-03-02T01:18:00Z")

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Are the 1870 1 percent and 1.4 percent samples independent? Can they be merged for a (roughly) 2 percent sample (taking account of weights)?

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**Author:** ![Michelle\_Pratt](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.ipums.org/michelle_pratt/32/194_2.png) [@Michelle\_Pratt](https://forum.ipums.org/u/Michelle_Pratt)\
**Post date:** [March 2, 2018, 3:48pm UTC](https://forum.ipums.org/t/1870-samples-independent/2190/2 "2018-03-02T15:48:00Z")

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The 1870 1% and 1870 1.2% samples are not necessarily mutually exclusive. Therefore, they should not be merged together to create a ~2% sample. The difference in the two samples can be found [here](https://usa.ipums.org/usa/sampdesc.shtml#us1870a).