# Question about longitudinal weights

**URL:** <https://forum.ipums.org/t/question-about-longitudinal-weights/4005>\
**Category:** CPS\
**Created:** [March 2, 2021, 7:18pm UTC](https://forum.ipums.org/t/question-about-longitudinal-weights/4005 "2021-03-02T19:18:58Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Matthew\_Bombyk](https://avatars.discourse-cdn.com/v4/letter/m/34f0e0/32.png) [@Matthew\_Bombyk](https://forum.ipums.org/u/Matthew_Bombyk)\
**Post date:** [March 5, 2021, 7:15pm UTC](https://forum.ipums.org/t/question-about-longitudinal-weights/4005/2 "2021-03-05T19:15:16Z")

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LNKFWMIS14WT is zero in these circumstances:

1. Any cases that do not have MISH = 1 (see the [Universe page](https://cps.ipums.org/cps-action/variables/LNKFWMIS14WT#universe_section) for LNKFWMIS14WT).
2. Any individual who does not appear in all of the first four months in sample. They may have a missing survey in one or more of those months, or the sample may not be available.

I suspect these are why you are seeing so many zeros, but please follow up if you think that’s not the case.

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