Reliable subnational mortality estimates are essential in the study of health inequalities within a country. One of the difficulties in producing such estimates is the presence of small populations among which the stochastic variation in death counts is relatively high, and thus the underlying mortality levels are unclear. We present a Bayesian hierarchical model to estimate mortality at the subnational level. The model builds on characteristic age patterns in mortality curves, which are constructed using principal components from a set of reference mortality curves. Information on mortality rates are pooled across geographic space and are smoothed over time. Testing of the model shows reasonable estimates and uncertainty levels when it is applied both to simulated data that mimic U.S. counties and to real data for French départements. The model estimates have direct applications to the study of subregional health patterns and disparities.
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Throughout this article, we refer to the Y px as principal components for simplicity, even though technically Y px is the pth vector of principal component loadings.
Data on age-specific mortality rates are available through the Centers for Disease Control and Prevention (CDC) Wide-ranging Online Data for Epidemiologic Research (WONDER) tool (https://wonder.cdc.gov/).
Personal communication to Magali Barbieri by the Division des statistiques régionales, locales et urbaines, INSEE (May 28, 2013). We chose to use French départements data because at the time of writing, data for all U.S. counties were not readily available.
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This study was made possible by an award from the Center on the Economics and Demography of Aging (National Institute on Aging grant P30-AG012839) at the University of California, Berkeley. However, any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors alone and do not necessarily represent the official views of the National Institute on Aging. The authors would like to thank two anonymous reviewers for helpful comments on an earlier version of this manuscript.
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Alexander, M., Zagheni, E. & Barbieri, M. A Flexible Bayesian Model for Estimating Subnational Mortality. Demography 54, 2025–2041 (2017). https://doi.org/10.1007/s13524-017-0618-7
- Subnational estimation
- Bayesian hierarchical model
- Principal components