Sex Differential Dynamics in Coherent Mortality Models
Abstract
:1. Introduction
Data and Notation
2. Changes in Mortality, Life Expectancy, and Sex Differentials
2.1. Decomposing Changes in Life Expectancy
2.2. The Rise and Fall of Sex Differentials in Western Europe
Pollard’s Paradox
3. Sex Differentials in Coherent Mortality Models
3.1. Coherent Mortality Modeling
3.2. Example: Sex Gap Unimodality for Truncated Exponential Distributions
3.3. Main Result
3.4. Counterexample
4. The Dynamic Gompertz Model
4.1. The Model
4.2. Sex Gap Unimodality under Uniform Rates of Improvement
4.3. Sex Gap Trajectories
5. The Forecast of Closing Sex Gaps by Coherent Mortality Models
5.1. Location of the Sex Gap Zenith under Uniform Rates of Improvement
5.2. Coherence Implies Closing Sex Gaps
5.3. Does Coherence Deserve Its Special Status?
6. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Appendix A. Proofs and Lemmas
Appendix A.1. Stochastic Dominance
Appendix A.2. Proof of Theorem 1
Appendix B. Graduation of μ(x)
Appendix B.1. General Smoothing
Appendix B.2. Old-Age Smoothing
Appendix B.3. Mortality for the Combined Curve
Appendix C. Life Expectancy under Piecewise Constancy
References
- Li, N.; Lee, R. Coherent mortality forecasts for a group of populations: An extension of the Lee-Carter method. Demography 2005, 42, 575–594. [Google Scholar] [CrossRef] [PubMed]
- Lee, R.; Carter, L. Modeling and Forecasting U.S. Mortality. J. Am. Stat. Assoc. 1992, 87, 659–671. [Google Scholar] [CrossRef]
- Hyndman, R.J.; Booth, H.; Yasmeen, F. Coherent mortality forecasting: The product-ratio method with functional time series models. Demography 2013, 50, 261–283. [Google Scholar] [CrossRef]
- Li, J.S.H.; Hardy, M. Measuring Basis Risk in Longevity Hedges. N. Am. Actuar. J. 2011, 15, 177–200. [Google Scholar] [CrossRef]
- Li, J. A Poisson common factor model for projecting mortality and life expectancy jointly for females and males. Popul. Stud. 2013, 67, 111–126. [Google Scholar] [CrossRef] [PubMed]
- Zhou, R.; Wang, Y.; Kaufhold, K.; Li, J.S.H.; Tan, K.S. Modeling period effects in multi-population mortality models: Applications to Solvency II. N. Am. Actuar. J. 2014, 18, 150–167. [Google Scholar] [CrossRef]
- Kleinow, T. A common age effect model for the mortality of multiple populations. Insur. Math. Econ. 2015, 63, 147–152. [Google Scholar] [CrossRef]
- Jarner, S.F.; Kryger, E.M. Modelling adult mortality in small populations: The SAINT model. ASTIN Bull. J. IAA 2011, 41, 377–418. [Google Scholar] [CrossRef]
- Cairns, A.J.; Blake, D.; Dowd, K.; Coughlan, G.D.; Khalaf-Allah, M. Bayesian Stochastic Mortality Modelling for Two Populations. ASTIN Bull. 2011, 41, 29–59. [Google Scholar] [CrossRef]
- Börger, M.; Aleksic, M.C. Coherent projections of age, period, and cohort dependent mortality improvements. In Proceedings of the 30th International Congress of Actuaries, Washington, DC, USA, 26–30 March 2014. [Google Scholar]
- Shang, H.L.; Hyndman, R.J. Grouped functional time series forecasting: An application to age-specific mortality rates. J. Comput. Graph. Stat. 2017, 26, 330–343. [Google Scholar] [CrossRef] [Green Version]
- Hunt, A.; Blake, D. Identifiability, cointegration and the gravity model. Insur. Math. Econ. 2018, 78, 360–368. [Google Scholar] [CrossRef]
- Jarner, S.F.; Jallbjørn, S. Pitfalls and merits of cointegration-based mortality models. Insur. Math. Econ. 2020, 90, 80–93. [Google Scholar] [CrossRef]
- Trovato, F.; Lalu, N. Narrowing sex differentials in life expectancy in the industrialized world: Early 1970’s to early 1990’s. Soc. Biol. 1996, 43, 20–37. [Google Scholar] [CrossRef] [PubMed]
- Glei, D.A.; Horiuchi, S. The narrowing sex differential in life expectancy in high-income populations: Effects of differences in the age pattern of mortality. Popul. Stud. 2007, 61, 141–159. [Google Scholar] [CrossRef] [PubMed]
- Retherford, R.D. Tobacco smoking and the sex mortality differential. Demography 1972, 9, 203–215. [Google Scholar] [CrossRef]
- Mäkelä, P. Alcohol-related mortality by age and sex and its impact on life expectancy: Estimates based on the Finnish death register. Eur. J. Public Health 1998, 8, 43–51. [Google Scholar] [CrossRef]
- Preston, S.H.; Wang, H. Sex mortality differences in the United States: The role of cohort smoking patterns. Demography 2006, 43, 631–646. [Google Scholar] [CrossRef]
- Pampel, F.C.; Zimmer, C. Female labour force activity and the sex differential in mortality: Comparisons across developed nations, 1950–1980. Eur. J. Popul. Eur. De Démographie 1989, 5, 281–304. [Google Scholar] [CrossRef]
- Trovato, F. Narrowing sex differential in life expectancy in Canada and Austria: Comparative analysis. Vienna Yearb. Popul. Res. 2005, 1, 17–52. [Google Scholar] [CrossRef]
- Waldron, I. Sex differences in human mortality: The role of genetic factors. Soc. Sci. Med. 1983, 17, 321–333. [Google Scholar] [CrossRef]
- Pampel, F.C. Declining sex differences in mortality from lung cancer in high-income nations. Demography 2003, 40, 45–65. [Google Scholar] [CrossRef]
- Trovato, F.; Lalu, N. From divergence to convergence: The sex differential in life expectancy in Canada, 1971–2000. Can. Rev. Sociol. Can. De Sociol. 2007, 44, 101–122. [Google Scholar] [CrossRef] [PubMed]
- Booth, H. Epidemiologic Transition in Australia–the last hundred years. Can. Stud. Popul. 2016, 43, 23–47. [Google Scholar] [CrossRef]
- Cui, Q.; Canudas-Romo, V.; Booth, H. The Mechanism Underlying Change in the Sex Gap in Life Expectancy at Birth: An Extended Decomposition. Demography 2019, 56, 2307–2321. [Google Scholar] [CrossRef] [PubMed]
- Human Mortality Database. University of California, Berkeley (USA), and Max Planck Institute for Demographic Research (Germany). 2022. Available online: http://www.mortality.org (accessed on 4 January 2022).
- Pollard, J.H. The expectation of life and its relationship to mortality. J. Inst. Actuar. 1982, 109, 225–240. [Google Scholar] [CrossRef]
- Arriaga, E.E. Measuring and explaining the change in life expectancies. Demography 1984, 21, 83–96. [Google Scholar] [CrossRef]
- Keyfitz, N. Applied Mathematical Demography; John Wiley and Sons: New York, NY, USA, 1977. [Google Scholar]
- Vaupel, J.W.; Romo, V.C. Decomposing change in life expectancy: A bouquet of formulas in honor of Nathan Keyfitz’s 90th birthday. Demography 2003, 40, 201–216. [Google Scholar] [CrossRef]
- Vaupel, J.W. How change in age-specific mortality affects life expectancy. Popul. Stud. 1986, 40, 147–157. [Google Scholar] [CrossRef]
- Goldman, N.; Lord, G. A new look at entropy and the life table. Demography 1986, 23, 275–282. [Google Scholar] [CrossRef]
- Kalben, B.B. Why Men Die Younger: Causes of Mortality Differences by Sex. N. Am. Actuar. J. 2000, 4, 83–111. [Google Scholar] [CrossRef]
- Zarulli, V.; Jones, J.A.B.; Oksuzyan, A.; Lindahl-Jacobsen, R.; Christensen, K.; Vaupel, J.W. Women live longer than men even during severe famines and epidemics. Proc. Natl. Acad. Sci. USA 2018, 115, E832–E840. [Google Scholar] [CrossRef] [PubMed]
- Coleman, D.A. The Demographic Transition in Ireland in International Context. Proc. Br. Acad. 1992, 79, 53–57. [Google Scholar]
- Li, N.; Lee, R.; Gerland, P. Extending the Lee-Carter method to model the rotation of age patterns of mortality decline for long-term projections. Demography 2013, 50, 2037–2051. [Google Scholar] [CrossRef]
- Jarner, S.F.; Jallbjørn, S. The SAINT Model: A Decade Later. ASTIN Bull. J. IAA 2022, 52, 483–517. [Google Scholar] [CrossRef]
- Oeppen, J.; Vaupel, J.W. Broken limits to life expectancy. Science 2002, 296, 1029–1031. [Google Scholar] [CrossRef]
- Bennett, J.E.; Pearson-Stuttard, J.; Kontis, V.; Capewell, S.; Wolfe, I.; Ezzati, M. Contributions of diseases and injuries to widening life expectancy inequalities in England from 2001 to 2016: A population-based analysis of vital registration data. Lancet Public Health 2018, 3, e586–e597. [Google Scholar] [CrossRef]
- Cairns, A.J.; Kallestrup-Lamb, M.; Rosenskjold, C.; Blake, D.; Dowd, K. Modelling socio-economic differences in mortality using a new affluence index. ASTIN Bull. 2019, 49, 555–590. [Google Scholar] [CrossRef] [Green Version]
- Lindvall, T. Lectures on the coupling method; Dover Publications: New York, NY, USA, 2002. [Google Scholar]
- Rudin, W. Principles of Mathematical Analysis; McGraw-Hill: New York, NY, USA, 1976; Volume 3. [Google Scholar]
- Thatcher, A.R.; Kannisto, V.; Vaupel, J.W. The force of mortality at ages 80 to 120; Odense University Press: Odense, Denmark, 1998. [Google Scholar]
Gompertz Mortality Curve | Graduated Mortality Curve | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Country | Data Avail | 1950 | 1985 | 2020 | 1950 | 1985 | 2020 | 1950 | 1985 | 2020 | 1950 | 1985 | 2020 |
1. Austria | 1947–2019 | 33.2 | 34.5 | 32.1 | 6.9 | 13.5 | 11.5 | 47.5 | 43.8 | 41.4 | 5.3 | 10.6 | 7.8 |
2. Belgium | 1841–2020 | 32.8 | 35.0 | 31.8 | 7.6 | 11.5 | 9.8 | 43.0 | 45.0 | 52.0 | 6.2 | 8.3 | 6.2 |
3. Denmark | 1835–2020 | 28.0 | 36.7 | 32.0 | 3.5 | 8.4 | 6.7 | 27.5 | 33.8 | 29.8 | 4.5 | 8.0 | 8.5 |
4. Finland | 1878–2020 | 35.6 | 36.3 | 33.8 | 12.2 | 15.6 | 14.4 | 49.2 | 49.2 | 45.7 | 8.9 | 12.2 | 11.0 |
5. France | 1816–2018 | 35.4 | 36.8 | 34.7 | 7.7 | 15.4 | 13.4 | 54.3 | 56.0 | 58.6 | 5.9 | 10.9 | 8.6 |
6. Iceland | 1838–2018 | 34.1 | 33.9 | 29.9 | 8.9 | 13.0 | 8.8 | 37.6 | 44.5 | 43.1 | 9.2 | 9.4 | 6.2 |
7. Ireland | 1950–2017 | 87.9 | 35.8 | 30.7 | 2.0 | 8.1 | 8.1 | 73.7 | 36.0 | 37.9 | 1.7 | 8.4 | 8.9 |
8. Italy | 1872–2018 | 31.7 | 34.3 | 31.3 | 5.6 | 12.1 | 9.8 | 48.1 | 44.1 | 39.0 | 4.0 | 9.1 | 7.4 |
9. Luxembourg | 1960–2019 | 32.1 | 35.8 | 31.8 | 9.8 | 10.0 | 9.5 | 32.4 | 38.3 | 31.3 | 9.1 | 10.3 | 10.1 |
10. Netherlands | 1850–2019 | 28.0 | 36.2 | 30.9 | 3.7 | 9.4 | 5.2 | 30.9 | 66.2 | 37.7 | 4.6 | 7.0 | 4.7 |
11. Norway | 1846–2020 | 29.7 | 34.8 | 30.1 | 5.4 | 12.2 | 7.4 | 34.3 | 39.3 | 40.3 | 6.2 | 10.0 | 7.6 |
12. Portugal | 1940–2020 | 38.0 | 34.8 | 34.3 | 7.2 | 12.9 | 15.5 | 55.9 | 43.6 | 62.0 | 5.0 | 11.2 | 9.2 |
13. Spain | 1908–2018 | 37.8 | 34.5 | 33.3 | 6.4 | 13.8 | 13.3 | 54.5 | 47.6 | 64.8 | 4.9 | 10.4 | 7.7 |
14. Sweden | 1751–2020 | 28.8 | 34.3 | 30.3 | 4.0 | 10.1 | 7.1 | 29.6 | 51.5 | 37.8 | 5.5 | 7.3 | 8.4 |
15. Switzerland | 1876–2020 | 32.1 | 34.8 | 30.3 | 6.7 | 11.7 | 9.2 | 41.2 | 42.9 | 38.3 | 5.7 | 9.6 | 7.9 |
16. United Kingdom | 1922–2018 | 38.1 | 39.3 | 31.4 | 5.2 | 6.9 | 8.0 | 61.5 | 35.2 | 42.2 | 4.5 | 6.6 | 6.7 |
17. West Germany | 1956–2017 | 31.5 | 34.7 | 32.0 | 8.7 | 11.4 | 10.4 | 39.2 | 54.4 | 55.1 | 7.2 | 8.1 | 6.0 |
Gompertz Model | Li-Lee Model | The Product-Ratio Model | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Country | 1960 | 1965 | 1970 | 1975 | 1980 | 1960 | 1965 | 1970 | 1975 | 1980 | 1960 | 1965 | 1970 | 1975 | 1980 |
1. Austria | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ |
2. Belgium | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ |
3. Denmark | ↘ | ↘ | ↘ | ↘ | ↗ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↗ | ↘ |
4. Finland | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ |
5. France | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ |
6. Iceland | ↘ | ↘ | ↘ | ↘ | ↘ | ↗ | ↗ | ↘ | ↘ | ↘ | ↗ | ↘ | ↘ | ↘ | ↘ |
7. Ireland | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ |
8. Italy | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↗ | ↘ |
9. Luxembourg | - | ↗ | ↗ | ↗ | ↘ | - | ↗ | ↘ | ↗ | ↗ | - | ↘ | ↗ | ↘ | ↗ |
10. Netherlands | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ |
11. Norway | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ |
12. Portugal | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↗ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ |
13. Spain | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ |
14. Sweden | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ |
15. Switzerland | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↗ | ↘ | ↘ | ↘ | ↘ | ↘ |
16. United Kingdom | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ |
17. West Germany | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | ↘ | - | ↘ | ↗ | ↘ | ↘ |
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Jallbjørn, S.; Jarner, S.F. Sex Differential Dynamics in Coherent Mortality Models. Forecasting 2022, 4, 819-844. https://doi.org/10.3390/forecast4040045
Jallbjørn S, Jarner SF. Sex Differential Dynamics in Coherent Mortality Models. Forecasting. 2022; 4(4):819-844. https://doi.org/10.3390/forecast4040045
Chicago/Turabian StyleJallbjørn, Snorre, and Søren Fiig Jarner. 2022. "Sex Differential Dynamics in Coherent Mortality Models" Forecasting 4, no. 4: 819-844. https://doi.org/10.3390/forecast4040045