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arXiv 2501.01129stat.AP
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基于α变换的组成数据分析在死亡率建模与预测中的应用

Compositional data analysis for modelling and forecasting mortality using the α-transformation

Institute of Mathematical Sciences, Faculty of Science, Universiti Malaya(马来亚大学理学院数学科学研究所);Universiti Malaya Centre for Data Analytics, Universiti Malaya(马来亚大学数据分析中心);Center of Research for Statistical Modelling and Methodology, Faculty of Science, Universiti Malaya(马来亚大学理学院统计建模与方法研究中心)

Han Ying Lim, Dharini Pathmanathan, Sophie Dabo-Niang

AI总结:

本文提出基于α变换的非功能性CoDA模型,用于改进死亡率预测,证明其在多数情况下与CLR变换相当,并在部分情况下提升预测准确性。

摘要:

死亡率预测对于人口规划和精算研究至关重要,尤其是在预测人口老龄化和长寿风险方面。传统方法主要依赖于外推方法,如Lee-Carter模型,这些方法使用死亡率率作为死亡率指标。近年来,尊重可和性与非负性约束的组成数据分析(CoDA)在死亡率预测中获得了越来越多的关注。尽管中心对数比(CLR)变换常用于将组成数据映射到实空间,但α变换作为对数比变换的推广,提供了更大的灵活性和适应性。本研究通过在非功能性CoDA模型中引入α变换作为CLR变换的替代方案,为死亡率预测做出了贡献。为了公平比较变换选择对预测准确性的影响,数据中的零值被进行了插值,尽管α变换本身可以处理这些零值。使用1983年至2018年间31个选定的欧洲国家/地区中男性和女性的年龄特定生命表死亡次数,所提出的方法在大多数情况下表现出与CLR变换相当的性能,在某些情况下预测准确性有所提高。这些发现突显了α变换在非功能性CoDA框架内增强死亡率预测的潜力。

英文摘要:

Mortality forecasting is crucial for demographic planning and actuarial studies, especially for projecting population ageing and longevity risk. Classical approaches largely rely on extrapolative methods, such as the Lee-Carter (LC) model, which use mortality rates as the mortality measure. In recent years, compositional data analysis (CoDA), which respects summability and non-negativity constraints, has gained increasing attention for mortality forecasting. While the centred log-ratio (CLR) transformation is commonly used to map compositional data to real space, the α-transformation, a generalisation of log-ratio transformations, offers greater flexibility and adaptability. This study contributes to mortality forecasting by introducing the α-transformation as an alternative to the CLR transformation within a non-functional CoDA model that has not been previously investigated in existing literature. To fairly compare the impact of transformation choices on forecast accuracy, zero values in the data are imputed, although the α-transformation can inherently handle them. Using age-specific life table death counts for males and females in 31 selected European countries/regions from 1983 to 2018, the proposed method demonstrates comparable performance to the CLR transformation in most cases, with improved forecast accuracy in some instances. These findings highlight the potential of the α-transformation for enhancing mortality forecasting within the non-functional CoDA framework.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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