Inconsistencies in ACS 2022 5-Year Estimates: A Case Study of BYUI Gender Ratios

Hello ACS Data Community,

I recently stumbled upon a perplexing issue in the 2022 ACS 5-year estimates that I believe warrants discussion. According to the official enrollment statistics provided by BYU-Idaho (byui.edu/executive-strategy-and-planning/institutional-data/official-enrollment-statistics), the ratio of male to female students is roughly balanced, hovering around a 1:1 ratio.

https://www.byui.edu/executive-strategy-and-planning/institutional-data/official-enrollment-statistics

However, this seems to be in stark contrast with the ACS 2022 5-year estimates for the Rexburg, ID Micro Area, specifically in the S12002 table.

https://data.census.gov/table/ACSDT5Y2022.B12002?q=B12002:%20Sex%20by%20Marital%20Status%20by%20Age%20for%20the%20Population%2015%20Years%20and%20Over&g=310XX00US39940

The ACS data indicates a surplus of 5643 never married women in the area, which seems implausible given the university's gender ratio. This discrepancy raises serious concerns about the accuracy of the ACS estimates. Could this be a methodological error or a misinterpretation of the data?

I reached out to the ACS team regarding this issue, but they firmly denied any error in their data. This response is a bit disconcerting as it challenges our understanding of the demographic dynamics in university-centric areas like Rexburg. I'm curious to hear your thoughts and experiences regarding similar discrepancies in ACS data, especially in areas with significant young adult populations.

How do we reconcile such stark differences in data from reliable sources? Are there any methodological nuances of the ACS estimates that might explain this discrepancy? I look forward to a vibrant discussion on this issue.

Parents
  • Interesting. The Rexburg, ID Micropolitan Area seems to be all of Fremont and Madison counties (https://www2.census.gov/programs-surveys/economic-census/2007/reference-maps/id/metro/2007-us39940m-rexburg-id-micropolitan-statistical-area.pdf), so I'm guessing that there are other residents there who are not part of the university.

    It might also be worth looking at some of the school enrollment tables (any that start with B14), for example, B14002 actually lists people enrolled in college undergraduate years by sex. One thing to note though is that ACS only captures yes/no on school enrollment, not on any particular institution. So this would also include people who are enrolled in any other institutions who live in the micropolitan area (community colleges, other universities, and could even be online programs).

  • Right, BYUI's report supports this. Note the higher counts of women enrolled online

  • Male vs. female residence halls?

  • I pulled up the College enrollment in the Rexberg Micropolitan area and I include it here.  It does show the typical gap between men and women enrolled.  

    From a quick look at data on the area, there was a second College in the area that went out of business in 2021, and it may have been partially included in the data since it is 5 year study.  Most generally in College's today one has a large gap between Women and Men, with men not being as likely to enroll or graduate.  BYUI may be different in some ways, since they also have a count of "Returning Missionaries" on their website.

    I would suggest looking up the data in IPDEDS of colleges in the two counties, and seeing if there was enrollment before.  The College that closed, closed in 2021 so that may have skewed the data more male.  IPEDS is put out by the NCES, and reports what colleges report to it.

    I do not think that a marriage gap between women and men is enough to explain this.  There is a general gap in many places, because just the presence of a surplus of men or women would not account for such a gap on its own.  Put simply women no longer need to settle to support themselves, and may not want to marry someone less accomplished than they are.

    Statistics Rexburg, ID Micro Area; Idaho
       
    ACS22_5yr:B14002. Sex By School Enrollment By Level Of School By Type Of School For The Population 3 Years And Over      
      Estimate Std. Error
    Total: 63,184 103.64
    Male: 29,274 46.3% 149.70
    Enrolled In College Undergraduate Years: 9,172 14.5% 409.70
    Public School 1,519 2.4% 232.73
    Private School 7,653 12.1% 418.18
    Enrolled In Graduate Or Professional School: 291 0.5% 95.76
    Public School 234 0.4% 84.85
    Private School 57 0.1% 30.91
    Not Enrolled In School 14,277 22.6% 385.45
    Female: 33,910 53.7% 144.24
    Enrolled In College Undergraduate Years: 13,147 20.8% 521.21
    Public School 2,997 4.7% 766.67
    Private School 10,150 16.1% 819.39
    Enrolled In Graduate Or Professional School: 253 0.4% 66.67
    Public School 186 0.3% 60.00
    Private School 67 0.1% 30.91
    Not Enrolled In School 14,923 23.6% 470.30
  • women no longer need to settle to support themselves, and may not want to marry someone less accomplished than they are

    No. This is suitable for describing female academics in Boston college town or female professionals in Manhattan NYC, but it is definitely not suitable for a place like Rexburg where everyone wants to get married.

  • In fact, I also have the YSA ward directory, and they also show the never male names of all LDS members in the area. According to statistics, the male to female ratio is still 1:1

  • This map doesn't prove or disprove anything. In fact, it's not relevant at all. Your question was why the ACS counts of never-married women vs. men are so disparate in Rexburg. College enrollment -- on campus or online -- doesn't matter. There are plenty of unmarried/never-married women (and men) that are not in college.

  • No, they wouldn't come here if they didn't go to college, very few local residents here

  • Really? So there are 64,349 people in the Rexburg Micro Area, and around 22,000 are BYUI on-campus enrollees. Around 4,000 people work for the university. What do the other 38,000 people do? You've observed them all and inquired as to their marital status? 

  • What does this mean 
    23,000+
    Students Each Semester
    13,000
    Returned Missionaries
  • Glenn, I had the same response you did, but when I looked at the granular data, it seems like most of the strange data is in the city of Roxburg (about half the population of the MuSA), and looking at census tracts, it's in the area of the city where the university is.

    Question: Doesn't the ACS use administrative data submitted by institutions for group quarters? Could this be an issue with data submitted by the university?

  • According to the IPEDS Feedback report 57% of the Students are female.

    The report is available here and relevant graph is below:  nces.ed.gov/.../ReportPDF.aspx

  • Maybe LDS women are more similar to other women than you think.  Note the so-called 35 Peer Schools have 58% women.  These numbers are from 2019 per IPEDS.  Or maybe LDS guys drop out real fast :).

  • That could be, sure. The ACS methodology mentions a two phase GQ survey -- facility level and person level. 

    https://www2.census.gov/programs-surveys/acs/methodology/design_and_methodology/2022/acs_design_methodology_ch08_2022.pdf

    Seems weird that mis-reporting at the facility level would not be corrected in the later phases of personal contacts and QC, but I'm sure it's possible. 

  • Glenn--

    I don't think there was misreporting.   The ratio reported by BYUI to IPEDS is an exact match  to the ratio in the ACS.

    IPEDS 55% women   ACS 52.99% Women  10,150 or 17,803 Private College Undergrads.

    This based upon two official sources:  the ACS, the IPEDS data as reported by BYUI.

    Andy

  • I don't think there was misreporting.   The ratio reported by BYUI to IPEDS is an exact match  to the ratio in the ACS.

    I did some misreporting of my own-- IPEDS 57% female.  ACS 57.01 Female 10150 of 17803 undergrads and private colleges or universities.

    This based is upon two official sources:  the ACS and, the IPEDS data as reported by BYUI.

    Andy

Reply
  • I don't think there was misreporting.   The ratio reported by BYUI to IPEDS is an exact match  to the ratio in the ACS.

    I did some misreporting of my own-- IPEDS 57% female.  ACS 57.01 Female 10150 of 17803 undergrads and private colleges or universities.

    This based is upon two official sources:  the ACS and, the IPEDS data as reported by BYUI.

    Andy

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