On age composition of dynamic heterogeneous populations

Cha, Ji Hwan and Finkelstein, Maxim (2023) On age composition of dynamic heterogeneous populations. Stochastic Models. pp. 1-16. ISSN 1532-6349 (https://doi.org/10.1080/15326349.2023.2263538)

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Abstract

Populations of items continuously manufactured and incepted into operation are characterized by the corresponding distribution of a random age at each instant of chronological time. In this study, we consider heterogeneous populations with lifetime distributions indexed by a frailty parameter. Two approaches to defining the age composition for the described populations are described and the corresponding stochastic comparisons are considered.