A reducible four-parameter system of model life tables
Abstract
Abstract In this paper a four-parameter extension of Brass's relational system of model life tables is suggested that (1) matches a wide range of empirical age patterns of mortality, (2) is easy to apply, especially to partial life tables, and (3) contains demographically meaningful parameters. A test of the model on a set of 62 empirical life tables indicates that four parameters are necessary and sufficient for fitting a wide range of mortality patterns. A further test on an historical series of Swedish life tables reveals a consistent pattern of mortality change. Examination of the parameters for a set of geographicallyrelated life tables suggests a way to define families of life tables. Identification of such temporal and spatial relationships allows the model to be reduced to a form with twoor three-parameters for application to incomplete or inaccurate data.
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For 64 registries that provided abridged or unsmoothed complete mortality rates, the Ewbank relational model with 3 or 4 parameters was used to interpolate and smooth mortality rates against a high-quality smooth life table from a similar country.
“For 64 registries that provided abridged mortality rates, or complete mortality rates that were not smoothed, we used the Ewbank relational model38 with 3 or 4 parameters to interpolate (if abridged) and smooth the mortality rates for the registry territory against a high-quality smooth life table for a country with a similar pattern of mortality by age.39”
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References 10 · Cited by 86
- Authors
- Ewbank, D. C., Gomez De Leon, J. C., & Stoto, M. A.
- Affiliations
- University of Pennsylvania (US)
- Harvard University (US)
- ORCID
- Stoto, M. A.
- Venue
- Population Studies
- Publisher
- Informa UK Limited
- Published
- 1983-03
- Volume
- 37
- Issue
- 1
- Pages
- 105-127
- ISSN
- 0032-4728 (ISSN-L)
- 1477-4747
- OpenAlex
- W2052051351
- Cited by
- 86
- References
- 10
- Citations by year
- 2026: 2 · 2025: 5 · 2023: 3 · 2021: 2 · 2020: 1 · 2018: 3 · 2017: 1 · 2016: 3 · 2015: 6 · 2014: 3 · 2013: 4 · 2012: 1
- FWCI
- 3.86
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Population Studies (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Social Sciences › Demography › Insurance, Mortality, Demography, Risk Management
- Physical Sciences › Mathematics › Statistics and Probability › Statistical Distribution Estimation and Applications
- Social Sciences › Decision Sciences › Management Science and Operations Research › demographic modeling and climate adaptation
- Keywords
- model life tables, age patterns of mortality, mortality change, mortality heterogeneity
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