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• W2157281098 abstract "Life insurers, pension funds, health care providers and social security institutions face increasing expenses due to continuing improvements of mortality rates. The actuarial and demographic literature has introduced a myriad of (deterministic and stochastic) models to forecast mortality rates of single populations. This paper presents a Bayesian analysis of two related multi-population mortality models of log-bilinear type, designed for two or more populations. Using a larger set of data, multi-population mortality models allow joint modelling and projection of mortality rates by identifying characteristics shared by all sub-populations as well as sub-population specific effects on mortality. This is important when modeling and forecasting mortality of males and females, regions within a country and when dealing with index-based longevity hedges. Our first model is inspired by the two factor Lee–Carter model of Renshaw and Haberman (Insur Math Eco 33(2):255–272, 2003) and the common factor model of Carter and Lee (Int J forecast 8:393–411, 1992. The second model is the augmented common factor model of Li and Lee (Demography 42(3):575–594, 2005). This paper approaches both models in a statistical way, using a Poisson distribution for the number of deaths at a certain age and in a certain time period. Moreover, we use Bayesian statistics to calibrate the models and to produce mortality forecasts. We develop the technicalities necessary for Markov Chain Monte Carlo ([MCMC]) simulations and provide software implementation (in R) for the models discussed in the paper. Key benefits of this approach are multiple. We jointly calibrate the Poisson likelihood for the number of deaths and the times series models imposed on the time dependent parameters, we enable full allowance for parameter uncertainty and we are able to handle missing data as well as small sample populations. We compare and contrast results from both models to the results obtained with a frequentist single population approach and a least squares estimation of the augmented common factor model." @default.
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• W2157281098 date "2015-09-19" @default.
• W2157281098 modified "2023-09-27" @default.
• W2157281098 title "Bayesian Poisson log-bilinear models for mortality projections with multiple populations" @default.
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• W2157281098 doi "https://doi.org/10.1007/s13385-015-0115-6" @default.
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