# Questions on MIGMET131

**URL:** <https://forum.ipums.org/t/questions-on-migmet131/4391>\
**Category:** USA\
**Created:** [November 17, 2021, 4:28pm UTC](https://forum.ipums.org/t/questions-on-migmet131/4391 "2021-11-17T16:28:20Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![JKim](https://avatars.discourse-cdn.com/v4/letter/j/258eb7/32.png) [@JKim](https://forum.ipums.org/u/JKim)\
**Post date:** [November 17, 2021, 4:28pm UTC](https://forum.ipums.org/t/questions-on-migmet131/4391/1 "2021-11-17T16:28:21Z")

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Hi,

I have two questions regarding MIGMET131 variable.

1. I am trying to use MIGMET131, but it says it has some errors because it is based on MIGPUMA. And there is MIGMET131ERR. Would there be a standard process to correct for the errors using the variable? Or is the variable just for trimming observations that has a high level of error?

2. I was wondering whether I can get the same crosswalk results between PUMA and metro area resided 1 year ago with 2013 OMB delineation of MSA if I combine crosswalk information on PUMA-MIGPUMA and PUMA-MET2013 provided.

Thanks!

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**Author:** ![JonathanSchroeder](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.ipums.org/jonathanschroeder/32/70_2.png) [@JonathanSchroeder](https://forum.ipums.org/u/JonathanSchroeder)\
**Post date:** [November 17, 2021, 10:09pm UTC](https://forum.ipums.org/t/questions-on-migmet131/4391/2 "2021-11-17T22:09:52Z")

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1. There’s not a standard process to correct for spatial mismatch errors. MIGMET13ERR is primarily intended, as you say, for trimming observations that have a high level of mismatch error. MIGMET131 identifies metro areas with mismatch errors of up to 15%. MIGMET13ERR allows users to identify and remove cases where the mismatch error is less than 15% but perhaps still “too large.” MIGMET13ERR could also be used to conduct a sensitivity analysis to determine how using a different error tolerance would affect results.

2. Yes, if I understand you correctly, it should be possible to reproduce the IPUMS crosswalks between 2013 MSAs and Migration PUMAs (links at the bottom of the [MIGMET131 description](https://usa.ipums.org/usa-action/variables/MIGMET131#description_section)) by combining info from the PUMA-MIGPUMA composition files and PUMA-MET2013 crosswalks.