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Modelling Age Patterns of Internal Migration at the Highest Ages

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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.

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Fig. 1
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Source: Author’s calculations based on ABS 2016 Census data

Fig. 4

Source: Author’s calculations based on Statistics Canada 2016 Census data

Fig. 5

Source: Author’s calculations based on Statistics Netherlands 2018 register data

Fig. 6

Source: Author’s calculations based on ABS 2011 and 2016 census data

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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.

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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).

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Correspondence to Tom Wilson.

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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

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