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The Strehler-Mildvan correlation from the perspective of a two-process vitality model

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  • Ting Li
  • James J. Anderson

Abstract

The Strehler and Mildvan (SM) general theory of ageing and mortality provides a mechanism-based explanation of Gompertz's law and predicts a log-linear relationship between the two Gompertz coefficients, known as the SM correlation. While the SM correlation is supported by data from developed countries before the second half of the twentieth century, the recent breakdown of the correlation pattern in these countries has prompted demographers to conclude that SM theory needs to be reassessed. In this paper we use a newly developed two-process vitality model to explain the SM correlation and its breakdown in terms of asynchronous trends in acute (extrinsic) and chronic (intrinsic) mortality factors. We propose that the mortality change in the first half of the twentieth century is largely determined by the elimination of immediate hazards to death, whereas the mortality change in the second half is primarily driven by the slowdown of the deterioration rate of intrinsic survival capacity.

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  • Ting Li & James J. Anderson, 2015. "The Strehler-Mildvan correlation from the perspective of a two-process vitality model," Population Studies, Taylor & Francis Journals, vol. 69(1), pages 91-104, March.
    • Handle: RePEc:taf:rpstxx:v:69:y:2015:i:1:p:91-104
    DOI: 10.1080/00324728.2014.992358
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    1. Maxim Finkelstein, 2008. "Failure Rate Modelling for Reliability and Risk," Springer Series in Reliability Engineering, Springer, number 978-1-84800-986-8, March.
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    Cited by:

    1. David J. Sharrow & James J. Anderson, 2016. "Quantifying Intrinsic and Extrinsic Contributions to Human Longevity: Application of a Two-Process Vitality Model to the Human Mortality Database," Demography, Springer;Population Association of America (PAA), vol. 53(6), pages 2105-2119, December.

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