# Question regarding data discrepancy in the same extracts

**URL:** <https://forum.ipums.org/t/question-regarding-data-discrepancy-in-the-same-extracts/4605>\
**Category:** USA\
**Created:** [April 12, 2022, 6:10pm UTC](https://forum.ipums.org/t/question-regarding-data-discrepancy-in-the-same-extracts/4605 "2022-04-12T18:10:58Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![HIMANI\_Sharma](https://avatars.discourse-cdn.com/v4/letter/h/c89c15/32.png) [@HIMANI\_Sharma](https://forum.ipums.org/u/HIMANI_Sharma)\
**Post date:** [April 12, 2022, 6:10pm UTC](https://forum.ipums.org/t/question-regarding-data-discrepancy-in-the-same-extracts/4605/1 "2022-04-12T18:10:58Z")

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Hi,

I was facing a question regarding what can lead to huge data discrepancy when you resubmit a previous extract. I extracted data number 24 on October 1, 2021. I needed the data again so I recently resubmitted it again . However, the statistics that I get from the data are different from what I obtained when I initially extracted the data 24. So I went ahead and extracted 24 again without the resubmit option, but the revision option (but not actually revising anything). The data extract number I get is extract 30 in my account. This time around my estimates were exactly same as what I got before. In sum , the statistics that I obtain from extract 24 is different from what I obtain from extract 30 (which is just a revision of 24, without actually revising anything) . For instance, if I do the summary of the variable inctot, the lower bound for extract 24 is 0 while for extract 30, it goes in the negative. I wanted to ask what can lead to this discrepancy, or is there something specific to my ipums account. Thank you.

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**Author:** ![KariWilliams](https://avatars.discourse-cdn.com/v4/letter/k/82dd89/32.png) [@KariWilliams](https://forum.ipums.org/u/KariWilliams)\
**Post date:** [April 20, 2022, 9:27pm UTC](https://forum.ipums.org/t/question-regarding-data-discrepancy-in-the-same-extracts/4605/2 "2022-04-20T21:27:20Z")

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This is definitely unexpected behavior. We are looking into the issue and will provide an update as soon as we have more information. My apologies for the inconvenience.

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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:** [April 29, 2022, 4:24pm UTC](https://forum.ipums.org/t/question-regarding-data-discrepancy-in-the-same-extracts/4605/3 "2022-04-29T16:24:14Z")

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I’m posting this on behalf of Kari since she is out of the office this week.

Thanks for your patience while we looked into this issue. This issue resulted from a rare interaction between how our extract engine is configured and the StatTransfer process for creating a Stata-formatted data file. The issue should not affect other data users going forward; however, you will need to use your _revised_ data extract instead of the resubmitted data extract to get the correct values. To confirm, your extract 30 (the revision), which includes a broader range of values for INCTOT is the correct version of the data.

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**Author:** ![HIMANI\_Sharma](https://avatars.discourse-cdn.com/v4/letter/h/c89c15/32.png) [@HIMANI\_Sharma](https://forum.ipums.org/u/HIMANI_Sharma)\
**Post date:** [May 1, 2022, 12:47pm UTC](https://forum.ipums.org/t/question-regarding-data-discrepancy-in-the-same-extracts/4605/4 "2022-05-01T12:47:31Z")

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Thank you for the confirmation!