TY - JOUR

T1 - The gompertz force of mortality in terms of the modal age at death

AU - Missov, Trifon I.

AU - Lenart, Adam

AU - Nemeth, Laszlo

AU - Canudas-Romo, Vladimir

AU - Vaupel, James W.

PY - 2015

Y1 - 2015

N2 - Background: The Gompertz force of mortality (hazard function) is usually expressed in terms of a, the initial level of mortality, and b, the rate at which mortality increases with age. OBJECTIVE We express the Gompertz force of mortality in terms of b and the old-age modal age at death M, and present similar relationships for other widely-used mortality models. Our objective is to explain the advantages of using the parameterization in terms of M. Methods: Using relationships among life table functions at the modal age at death, we express the Gompertz force of mortality as a function of the old-age mode. We estimate the correlation between the estimators of old (a and b) and new (M and b) parameters from simulated data. RESULTS When the Gompertz parameters are statistically estimated from simulated data, the correlation between estimated values of b and M is much less than the correlation between estimated values of a and b. For the populations in the Human Mortality Database, there is a negative association between a and b and a positive association between M and b.

AB - Background: The Gompertz force of mortality (hazard function) is usually expressed in terms of a, the initial level of mortality, and b, the rate at which mortality increases with age. OBJECTIVE We express the Gompertz force of mortality in terms of b and the old-age modal age at death M, and present similar relationships for other widely-used mortality models. Our objective is to explain the advantages of using the parameterization in terms of M. Methods: Using relationships among life table functions at the modal age at death, we express the Gompertz force of mortality as a function of the old-age mode. We estimate the correlation between the estimators of old (a and b) and new (M and b) parameters from simulated data. RESULTS When the Gompertz parameters are statistically estimated from simulated data, the correlation between estimated values of b and M is much less than the correlation between estimated values of a and b. For the populations in the Human Mortality Database, there is a negative association between a and b and a positive association between M and b.

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U2 - 10.4054/DemRes.2015.32.36

DO - 10.4054/DemRes.2015.32.36

M3 - Article

AN - SCOPUS:84940761434

VL - 32

SP - 1031

EP - 1048

JO - Demographic Research

JF - Demographic Research

SN - 1435-9871

IS - 1

ER -