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Research Article

College roommates have a modest but significant influence on each other’s political ideology

View ORCID ProfileLogan Strother, View ORCID ProfileSpencer Piston, Ezra Golberstein, View ORCID ProfileSarah E. Gollust, and View ORCID ProfileDaniel Eisenberg
  1. aDepartment of Political Science, Purdue University, West Lafayette, IN 47907;
  2. bDepartment of Political Science, Boston University, Boston, MA 02215;
  3. cDivision of Health Policy & Management, School of Public Health, University of Minnesota, Minneapolis, MN 55455;
  4. dProfessor of Health Policy and Management, Fielding School of Public Health, University of California, Los Angeles, CA 90095

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PNAS January 12, 2021 118 (2) e2015514117; first published December 21, 2020; https://doi.org/10.1073/pnas.2015514117
Logan Strother
aDepartment of Political Science, Purdue University, West Lafayette, IN 47907;
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  • ORCID record for Logan Strother
  • For correspondence: lstrothe@purdue.edu
Spencer Piston
bDepartment of Political Science, Boston University, Boston, MA 02215;
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  • ORCID record for Spencer Piston
Ezra Golberstein
cDivision of Health Policy & Management, School of Public Health, University of Minnesota, Minneapolis, MN 55455;
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Sarah E. Gollust
cDivision of Health Policy & Management, School of Public Health, University of Minnesota, Minneapolis, MN 55455;
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  • ORCID record for Sarah E. Gollust
Daniel Eisenberg
dProfessor of Health Policy and Management, Fielding School of Public Health, University of California, Los Angeles, CA 90095
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  • ORCID record for Daniel Eisenberg
  1. Edited by Susan T. Fiske, Princeton University, Princeton, NJ, and approved November 2, 2020 (received for review July 23, 2020)

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    Fig. 1.

    Effect of roommate distance on change in student Ideology.

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    Table 1.

    Distribution of student ideology at two points in time

    Wave 1Wave 2
    August 2009March−April 2010
    Far left72 (4.4%)73 (4.4%)
    Liberal689 (42.2%)653 (40.0%)
    Middle-of-the-road584 (35.8%)596 (36.5%)
    Conservative276 (16.9%)303 (18.6%)
    Far right11 (0.7%)7 (0.4%)
     Total1,6321,632
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    Table 2.

    Changes in student ideology over time

    Wave 1Wave 2Total
    Far leftLiberalMiddleConservativeFar right
    Far left502020072
    Liberal23542114100689
    Middle087430670584
    Conservative03492213276
    Far right0115411
     Total7365359630371,632
    • View popup
    Table 3.

    Changes in student ideology relative to their roommate, among respondents who were assigned to roommate of a different political ideology

    MovementRespondent ideology wave 1Total
    Far leftLiberalMiddleConservativeFar right
    Away from roommate017431061
    No change503452771754851
    Toward roommate207246467191
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    Table 4.

    Associations between roommate ideology (wave 1) and student ideology (wave 2)

    Model 1Model 2Model 3Model 4Model 5Model 6
    Roommate ideology0.0310.0310.0310.0390.0320.046
    SE0.0160.0160.0170.0170.0150.018
    P value0.0510.0540.0690.0260.0420.012
    Control variable(s)
      Student ideology (w1)✓✓✓✓✓✓
      Other controls—InstitutionRoommate PreferencesRoommate CharacteristicsStudent CharacteristicsAll (2 to 5)
    • Here n = 1,632. All models are OLS regressions. Both roommate ideology and student ideology are coded on a scale of 1 to 5. The check marks indicate that wave-1 (w1) student ideology is controlled for. For the full table of coefficient estimates (including control variables), see SI Appendix, Table S4.

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College roommates have a modest but significant influence on each other’s political ideology
Logan Strother, Spencer Piston, Ezra Golberstein, Sarah E. Gollust, Daniel Eisenberg
Proceedings of the National Academy of Sciences Jan 2021, 118 (2) e2015514117; DOI: 10.1073/pnas.2015514117

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College roommates have a modest but significant influence on each other’s political ideology
Logan Strother, Spencer Piston, Ezra Golberstein, Sarah E. Gollust, Daniel Eisenberg
Proceedings of the National Academy of Sciences Jan 2021, 118 (2) e2015514117; DOI: 10.1073/pnas.2015514117
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Proceedings of the National Academy of Sciences: 118 (2)
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    • The Effects of College on Political Ideology
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