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Variable-r in sex ratios: Formulas in honor of Jim Vaupel

Author

Listed:
  • Vladimir Canudas-Romo

    (Australian National University)

  • Wen Su

    (Australian National University)

  • Mike Hollingshaus

    (University of Utah)

Abstract

Background: Two seminal studies in the 1980s, by Preston and Coale (1982) and Arthur and Vaupel (1984), generalized the Lotka equations developing the variable-r methods. Objective: Time changes in sex ratios (males:females) are studied from the perspective of the variable-r method to estimate the contributions of fertility, mortality, and net-migration. Methods: The time change in sex ratios can be calculated as a comparison of the growth rates of the sexes. The difference is then decomposed into population composition, and the age-specific components of fertility, mortality, and net migration. Thirteen countries with long historical demographic series are used to illustrate the time trends in sex ratios. Results: Most countries are moving towards a greater number of males per females. The greatest changes were observed in Norway and Sweden, with males catching up with females at older ages due to survival. Meanwhile, the sex differential in net-migration flows explains the decline in sex ratios in Spain and Australia and the increase in the United States. Conclusions: Our results shed light on the debate on female–male population imbalances and how fertility, mortality, and net migration contribute to these disparities. Contribution: Vaupel and Canudas-Romo (2003) wrote a paper in honor of Vaupel’s mentor Nathan Keyfitz on his 90th anniversary. The paper focused on a common topic of interest of all three researchers, namely mathematical demography. In honor of the legacy of the work of Jim Vaupel, we revive that idea with a collection of mathematical derivations that are simple, yet powerful in their demographic interpretation.

Suggested Citation

  • Vladimir Canudas-Romo & Wen Su & Mike Hollingshaus, 2023. "Variable-r in sex ratios: Formulas in honor of Jim Vaupel," Demographic Research, Max Planck Institute for Demographic Research, Rostock, Germany, vol. 49(26), pages 693-722.
    • Handle: RePEc:dem:demres:v:49:y:2023:i:26
    DOI: 10.4054/DemRes.2023.49.26
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    References listed on IDEAS

    as
    1. James W. Vaupel & Vladimir Canudas-Romo, 2002. "Decomposing demographic change into direct vs. compositional components," Demographic Research, Max Planck Institute for Demographic Research, Rostock, Germany, vol. 7(1), pages 1-14.
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    More about this item

    Keywords

    sex ratio; variable-r method; cohort analysis; growth rate;
    All these keywords.

    JEL classification:

    • J1 - Labor and Demographic Economics - - Demographic Economics
    • Z0 - Other Special Topics - - General

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