Abstract
Model migration age schedules have proved valuable to demographers for a range of applications for over 40 years. The original Rogers-Castro curve has been extended over time to include a retirement curve, a post-retirement curve, and a student peak. With demographic analyses extending to higher age groups than in the past due to population ageing, it is important for the model schedule to faithfully reflect migration patterns at advanced ages. Recent data on internal migration in the nonagenarian and centenarian ages reveals several examples of rising then falling mobility with increasing age. This paper suggests an alternative specification of the post-retirement curve of the model schedule to reflect this pattern. The modified model migration schedule is successfully fitted to example internal migration age patterns from Australia, Canada and the Netherlands. The modified schedule should prove useful in preparing input data for population projections and analyses of migration age patterns extending to the highest ages.
Similar content being viewed by others
Data Availability
The Excel workbook used to fit the model migration schedule is available at https://doi.org/10.6084/m9.figshare.12415475. The VBA code is available within the workbook.
References
ABS. (2019). Australian census data extracted via TableBuilder Pro. https://www.abs.gov.au/websitedbs/D3310114.nsf/Home/2016%2520TableBuilder. Accessed 11 Aug 2019.
Bates, J., & Bracken, I. (1987). Migration age profiles for local authority areas in England, 1971–1981. Environment and Planning A,19, 521–535.
Bell, M. (1996). Understanding Internal Migration. Canberra: Australian Government Publishing Service.
Bernard, A., & Bell, M. (2015). Smoothing internal migration age profiles for comparative research. Demographic Research,32(33), 915–948.
Bernard, A., Bell, M., & Charles-Edwards, E. (2014). Life-course transitions and the age profile of internal migration. Population and Development Review,40(2), 213–239.
Congdon, P. (1993). Graduation in local demographic analysis and projection. Journal of the Royal Statistical Society Series A,156(2), 237–270.
Dittgen, A., & Dutreuilh, C. (2005). Housing and household size in local population dynamics. The example of Paris, Population (English edition),60(3), 259–298.
Dyrting, S. (2019). Smoothing migration intensities with P-TOPALS. Northern Institute, Charles Darwin University (Unpublished manuscript).
Ediev, D. M. (2018). Constrained mortality extrapolation to old age: an empirical assessment. European Journal of Population,34(3), 441–457.
Hofmeyer, B. E. (1988). Application of a mathematical model to South African migration data, 1975–1980. Southern African Journal of Demography,2(1), 24–28.
Hugo, G., Harris, K. (2011). Population distribution effects of migration in Australia. In Report for Department of Immigration and Citizenship. National Centre for Social Applications of GIS, The University of Adelaide.
Hunsinger, E. (2019). Eddie’s R code for fitting the multi-exponential model migration schedule with student peak. https://applieddemogtoolbox.github.io/Toolbox/#SPMMSRCode. Accessed 23 Sep 2019.
Ishikawa, Y. (2001). Migration turnarounds and schedule changes in Japan, Sweden and Canada. Review of Urban and Regional Development Studies,13(1), 20–33.
Jdanov, D. A., Scholz, R. D., & Shkolnikov, V. M. (2005). Official population statistics and the Human Mortality Database estimates of populations aged 80+ in Germany and nine other European countries. Demographic Research,13(14), 335–362.
Liaw, K., & Nagnur, D. N. (1985). Characterization of metropolitan and nonmetropolitan outmigration schedules of the Canadian population system, 1971–1976. Canadian Studies in Population,12(1), 81–102.
Peristera, P., & Kostaki, A. (2007). Modeling fertility in modern populations. Demographic Research,16(6), 141–194.
Pittenger, D. B. (1974). A typology of age-specific net migration rate distributions. Journal of the American Institute of Planners,40(4), 278–283.
Pittenger, D. B. (1978). On making flexible projections of age-specific net migration. Environment and Planning A,10(11), 1253–1272.
Potrykowska, A. (1988). Age patterns and model migration schedules in Poland. Geographia Polonica,54, 63–80.
Raymer, J., & Baffour, B. (2018). Subsequent migration of immigrants within Australia, 1981–2016. Population Research and Policy Review,37, 1053–1077.
Raymer, J., & Rogers, A. (2008). Applying model migration schedules to represent age-specific migration flows. In J. Raymer & F. Willekens (Eds.), International Migration in Europe: Data, Models and Estimates (pp. 175–192). Chichester: Wiley.
Rees, P. (1997). Problems and solutions in forecasting geographical populations. Journal of the Australian Population Association,14(2), 145–166.
Rees, P., Bell, M., Duke-Williams, O., & Blake, M. (2000). Problems and solutions in the measurement of migration intensities: Britain and Australia compared. Population Studies,54(2), 207–222.
Robine, J., & Cubaynes, S. (2017). Worldwide demography of centenarians. Mechanisms of Ageing and Development,165, 59–67.
Rogers, A. (1978). Model migration schedules: An application using data for the Soviet Union. Canadian Studies in Population,5, 85–98.
Rogers, A. (1988). Age patterns of elderly migration: An international companion. Demography,25(3), 355–370.
Rogers, A., Castro, L. J. (1981). Model migration schedules. In Research Report RR-81–30. Laxenburg: International Institute for Applied Systems Analysis.
Rogers, A., & Raymer, J. (1999). Fitting observed demographic rates with the multiexponential model schedule: an assessment of two estimation programs. Review of Urban and Regional Development Studies,11(1), 1–10.
Rogers, A., & Watkins, J. (1987). General versus elderly interstate migration and population redistribution in the United States. Research on Aging,9(4), 483–529.
Rogers, A., Racquillet, R., & Castro, L. J. (1978). Model migration schedules and their applications. Environment and Planning A,10(5), 475–502.
Rogers, A., Castro, L. J., & Lea, M. (2005). Model migration schedules: three alternative linear estimation methods. Mathematical Population Studies,12(1), 17–38.
Rogers, A., Little, J., & Raymer, J. (2010). The Indirect Estimation of Migration. Dordrecht: Springer.
Rowland, D. T. (2012). Population Aging. Dordrecht: Springer.
Ruiz-Santacruz, J. S., Garcés, J. (2018). migraR: prototype package for adjusting Rogers and Castro models. https://github.com/elflacosebas/migraR/ Accessed 23 Sept 2019.
Sander, N. (2011). Retirement migration of the Baby Boomers in Australia: Beach, Bush or Busted? PhD thesis, School of Geography, Planning and Environmental Management, The University of Queensland.
Statistics Netherlands. (2019). Internal migration data extracted via the Statline online tool. https://opendata.cbs.nl/statline/#/CBS/nl/. Accessed 24 Sep 2019.
Thatcher, R., Kannisto, V., & Andreev, K. (2002). The Survivor Ratio method for estimating numbers at high ages. Demographic Research,6(1), 1–18.
Thomas, M., Gillespie, B., & Lomax, N. (2019). Variations in migration motives over distance. Demographic Research,40(38), 1097–1110.
Wilson, T. (2010). Model migration schedules incorporating student migration peaks. Demographic Research, 23(8), 191–222.
Wilson, T. (2014). The impact of education-related mobility on inter-regional migration age profiles in Australia. Applied Spatial Analysis and Policy, 8(4), 371–391.
Wilson, T. (2015). The demographic constraints on future population growth in regional Australia. Australian Geographer, 46(1), 91–111.
Wilson, T. (2020). Model migration schedule fitting example. figshare. Excel workbook. https://doi.org/10.6084/m9.figshare.12415475.
Wilson, T., & Temple, J. (2020). More accurate estimates of Australia’s population at the highest ages. Manuscript under review. Melbourne School of Population and Global Health, The University of Melbourne.
Wilson, T., & Terblanche, W. (2018). New estimates of Australia’s centenarian population. International Journal of Population Data Science, 3(1), 1–10.
Acknowledgements
The author is grateful to Patrice Dion of Statistics Canada for facilitating access to Canadian census data. Eddie Hunsinger and Sigurd Dyrting kindly provided helpful feedback on an earlier draft. The suggestions of the anonymous reviewers were most helpful.
Funding
This work was funded by the Australian Research Council’s (ARC) Centre of Excellence in Population Ageing Research (CE1101029).
Author information
Authors and Affiliations
Corresponding author
Ethics declarations
Conflicts of interest
The author(s) declare that they have no conflict of interest.
Additional information
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
About this article
Cite this article
Wilson, T. Modelling Age Patterns of Internal Migration at the Highest Ages. Spat Demogr 8, 175–192 (2020). https://doi.org/10.1007/s40980-020-00062-7
Published:
Issue Date:
DOI: https://doi.org/10.1007/s40980-020-00062-7