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Research

I study topics in family demography and social stratification. Specifically, I am interested in how demographic change and educational stratification intersect with family formation processes and social inequality in Japan and the United States.

My published and ongoing research focus on four related areas.

  1. Demographic transition in ultra-low fertility contexts
  2. College expansion and social stratification
  3. Family demography of Asian Americans
  4. Integration of biological data in social science research

For a full list of publications and working papers, please see my CV or Google Scholar profile.

Research Hub of Population Studies, University of Hong Kong
Centre for Japanese Research, University of British Columbia

1. Demographic transition in ultra-low fertility contexts

  • Uchikoshi, Fumiya, Ryota Mugiyama, Shohei Yoda, James M. Raymo. (in progress). “Revisiting the Relationship between Marriage and Childbearing in Low-Fertility East Asia: Evidence from Japan.”
  • Tan, Jolene, Qi Cui, and Fumiya Uchikoshi. 2025. “The Rising Importance of Nuptiality Change: Policy Mismatch and Fertility Decline in Low-Fertility Asian Societies.” Chinese Sociological Review. doi: doi.org/10.1080/21620555.2025.2480296.
  • Uchikoshi, Fumiya, James M. Raymo, and Shohei Yoda. 2023. “Family Norms and Declining First Marriage Rates: The Role of Sibship Position in the Japanese Marriage Market.” Demography 60(3): 939-963. doi: doi.org/10.1215/00703370-10741873 [Replication package]
    • 2022 Honorable Mention for Student Paper Award, American Sociological Association Sociology of Population Section
  • Raymo, James M., Fumiya Uchikoshi, and Shohei Yoda. 2021. “Marriage Intentions, Desires, and Pathways to Later and Less Marriage in Japan.” Demographic Research 44: 67-98. doi: doi.org/10.4054/DemRes.2021.44.3 [Replication package]
  • Uchikoshi, Fumiya and Ryohei Mogi. 2018. “Order Matters: The Effect of Premarital Pregnancy on Second Childbearing in Japan” Demographic Research 39: 1305-1330. doi: doi.org/10.4054/DemRes.2018.39.48 [Replication package]

2. College expansion and social stratification

  • Uchikoshi, Fumiya. (in progress) “Gender Differences in Response after Rejection: The Case of Female Underrepresentation in Selective Colleges in Japan”
  • Uchikoshi, Fumiya, Kohei Toyonaga, and Erika Teramoto. 2025. “Consequences of Expanded Vocationally Oriented Programs for Gender Segregation and Inequality: The Case of Japanese Higher Education.” Research in Social Stratification and Mobility 97:101024. doi: 10.1016/j.rssm.2025.101024.
  • Uchikoshi, Fumiya. 2022. “Explaining Declining Trends in Educational Homogamy: The Role of Institutional Changes in Higher Education in Japan.” Demography 59(6): 2161-2186. doi: doi.org/10.1215/00703370-10271332 [Replication package]
  • Fujihara, Sho and Fumiya Uchikoshi. 2019. “Declining Association with Persistent Gender Asymmetric Structure: Patterns and Trends in Educational Assortative Marriage in Japan.” Research in Social Stratification and Mobility 60: 66-77. doi: doi.org/10.1016/j.rssm.2018. 12.001

3. Family demography of Asian Americans

  • Uchikoshi, Fumiya. (in progress). “Asian Americans’ Family Exceptionalism Revisited: Racial, Ethnic, and Educational Differences in Nonmarital Childbearing and Family Structure.” (proposal accepted for The Russell Sage Foundation Journal of the Social Sciences “Asians in America Beyond Education: Career Choices, Trajectories, and Mobility Strategies”)
    • 2024 Population Association of America Poster Award
  • Uchikoshi, Fumiya. (in progress). “Family Structure and Grade Retention among Asian Americans.”
    • 2024 Alan C. Kerckhoff Travel Award Winner, ISA RC28 Summer Meeting
  • Uchikoshi, Fumiya, James M. Raymo, and Yu Xie. (in progress). “Evaluating the Theory of Marriage as a Commitment Device: The Case of Asian Americans.”

4. Integration of biological data in social science research

  • Uchikoshi, Fumiya and Dalton Conley. (in progress) “The Origins and Consequences of Selective College Attendance through a Genetic Lens: Effects of Social Background and Genetic Endowment on College Selectivity and Earnings.”
    • 2024 Best Student Paper (Co-winner), American Sociological Association Section on Biosociology and Evolutionary Sociology
  • Uchikoshi, Fumiya and Dalton Conley. 2021. “Gene-environment Interaction for School Tracking in Secondary Education: Evidence from the U.S.” Research in Social Stratification and Mobility. doi: doi.org/10.1016/j.rssm.2021.100628