title: Mortality of a heterogeneous cohort; description and implications.
abstract: "A recent model for heterogeneous mortality by Vaupel et al....is shown to be based on incorrect definitions.  An alternative formulation is presented.  The results indicate that current methods for computing the survivorship and life expectation functions underestimate the true values.  A method is given for determining the possible magnitude of this underestimation.  The method is illustrated by a numerical example using U.S. data."
authors.forename: E
authors.initials: E
authors.lastname: Nour
mesh_terms: D000569:Americas; D015331:Cohort Studies; D003710:Demography; D019049:Developed Countries; D003906:Developing Countries; D005069:Evaluation Studies as Topic; D008017:Life Expectancy; D015993:Life Tables; D008136:Longevity; D008962:Models, Theoretical; D009026:Mortality; D009656:North America; D011153:Population; D011157:Population Dynamics; D015203:Reproducibility of Results; D012106:Research; D012107:Research Design; D013223:Statistics as Topic; D015996:Survival Rate; D014481:United States
keywords: Americas; Cohort Analysis; Critique; Demographic Analysis; Demographic Factors; Developed Countries; Developing Countries; Error Sources; Estimation Technics; Evaluation; Length Of Life; Life Expectancy; Life Table Method; Life Tables; Mathematical Model; Measurement; Models, Theoretical; Mortality; North America; Northern America; Population; Population Dynamics; Reliability; Research Methodology; Survivorship; United States