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The Predictive Validity of Subjective Probabilities of Survival

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  • Michael D. Hurd
  • Kathleen McGarry

Abstract

Although expectations (or subjective probability distributions) play a prominent role in models of decision-making under uncertainty, we have very little data on them and are instead forced to base our models on unverifiable assumptions. Macroeconomic models often assume rational expectations, and microeconomic models base estimation on observable population probabilities. An alternative to these assumptions is to query individuals directly about their subjective probabilities, and to use the responses as measures of expectations. Prior research on subjective survival probabilities in the Health and Retirement Study has shown that reported probabilities aggregate closely to life table values and covary appropriately with known risk factors. This paper uses panel data to study the evolution of subjective survival probabilities and their ability to predict actual mortality. We find that respondents modify appropriately their survival probabilities based on new information. The onset of a new disease condition or the death of a parent between the waves is associated with a reduction in survival probabilities. The subjective survival probabilities also predict actual survival. Those who survived in our panel reported probabilities approximately 50 percent greater at baseline than those who died. Although more needs to be learned about properties of subjective probabilities we conclude that they show considerable promise for estimating models of decision-making under uncertainty.

Suggested Citation

  • Michael D. Hurd & Kathleen McGarry, 1997. "The Predictive Validity of Subjective Probabilities of Survival," NBER Working Papers 6193, National Bureau of Economic Research, Inc.
  • Handle: RePEc:nbr:nberwo:6193 Note: AG
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    References listed on IDEAS

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    1. Daniel S. Hamermesh, 1985. "Expectations, Life Expectancy, and Economic Behavior," The Quarterly Journal of Economics, Oxford University Press, vol. 100(2), pages 389-408.
    2. Michael D. Hurd & Kathleen McGarry, 1995. "Evaluation of the Subjective Probabilities of Survival in the Health and Retirement Study," Journal of Human Resources, University of Wisconsin Press, vol. 30, pages s268-s292.
    3. J. Dominitz & C. F. Manski, "undated". "Using expectations data to study subjective income expectations," Institute for Research on Poverty Discussion Papers 1050-94, University of Wisconsin Institute for Research on Poverty.
    4. repec:aph:ajpbhl:1983:73:8:911-914_1 is not listed on IDEAS
    5. F. Thomas Juster & Richard Suzman, 1995. " An Overview of the Health and Retirement Study," Journal of Human Resources, University of Wisconsin Press, vol. 30, pages s7-s56.
    6. F. Thomas Juster, 1966. "Consumer Buying Intentions and Purchase Probability: An Experiment in Survey Design," NBER Books, National Bureau of Economic Research, Inc, number just66-2, January.
    7. Manski, C.F., 1989. "The Use Of Intentions Data To Predict Behaviour : A Best- Case Analysis," Working papers 8905, Wisconsin Madison - Social Systems.
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    More about this item

    JEL classification:

    • I12 - Health, Education, and Welfare - - Health - - - Health Behavior
    • J14 - Labor and Demographic Economics - - Demographic Economics - - - Economics of the Elderly; Economics of the Handicapped; Non-Labor Market Discrimination

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