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Perturbation analysis of indices of lifespan variability

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  • Alyson A. van Raalte

    (Max Planck Institute for Demographic Research, Rostock, Germany)

  • Hal Caswell

    (Max Planck Institute for Demographic Research, Rostock, Germany)

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    Abstract

    A number of indices have been used in recent years to calculate lifespan variation, each with different underlying properties. Although these indices are assumed to be interchangeable, little research has been conducted to show under which conditions this assumption is appropriate, or how to compare their responses to the underlying mortality schedule. We compare seven indices of lifespan variation: life disparity, the Gini coefficient, the standard deviation, the variance, Theil's index, the mean logarithmic deviation, and the inter-quartile range. We derive the sensitivity and elasticity of each index by applying Markov chain theory and matrix calculus. Using empirical French and Russian male data we compare the underlying sensitivities to mortality change under different mortality regimes in order to test under which conditions the indices might differ in their conclusions about the magnitude of lifespan variation. Finally we demonstrate how integrating these sensitivities can be used as a method of age decomposition. The result is an easily computable method for calculating the properties of this important class of longevity indices.

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    File URL: http://www.demogr.mpg.de/papers/working/wp-2012-004.pdf
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    Bibliographic Info

    Paper provided by Max Planck Institute for Demographic Research, Rostock, Germany in its series MPIDR Working Papers with number WP-2012-004.

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    Length: 43 pages
    Date of creation: Jan 2012
    Date of revision:
    Handle: RePEc:dem:wpaper:wp-2012-004

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    Web page: http://www.demogr.mpg.de/

    Related research

    Keywords: inequality; mathematical demography; mortality measurement;

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    1. Ryan D. Edwards, 2011. "Changes in World Inequality in Length of Life: 1970–2000," Population and Development Review, The Population Council, Inc., The Population Council, Inc., vol. 37(3), pages 499-528, 09.
    2. Ryan D. Edwards & Shripad Tuljapurkar, 2005. "Inequality in Life Spans and a New Perspective on Mortality Convergence Across Industrialized Countries," Population and Development Review, The Population Council, Inc., The Population Council, Inc., vol. 31(4), pages 645-674.
    3. Abadir,Karim M. & Magnus,Jan R., 2005. "Matrix Algebra," Cambridge Books, Cambridge University Press, Cambridge University Press, number 9780521822893.
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