淡江大學機構典藏:Item 987654321/80461
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    题名: Using quantile regression to examine the effects of inequality across the mortality distribution in the U.S. counties
    作者: Yang, Tse-Chuan;Chen, Vivian Yi-Ju;Carla Shoff;Stephen A Matthews
    贡献者: 淡江大學統計學系
    关键词: Quantile regression;Income inequality;Mortality;County;USA
    日期: 2012-06-01
    上传时间: 2013-01-25 00:16:49 (UTC+8)
    出版者: Oxford: Pergamon Press
    摘要: The U.S. has experienced a resurgence of income inequality in the past decades. The evidence regarding the mortality implications of this phenomenon has been mixed. This study employs a rarely used method in mortality research, quantile regression (QR), to provide insight into the ongoing debate of whether income inequality is a determinant of mortality and to investigate the varying relationship between inequality and mortality throughout the mortality distribution. Analyzing a U.S. dataset where the five-year (1998–2002) average mortality rates were combined with other county-level covariates, we found that the association between inequality and mortality was not constant throughout the mortality distribution and the impact of inequality on mortality steadily increased until the 80th percentile. When accounting for all potential confounders, inequality was significantly and positively related to mortality; however, this inequality–mortality relationship did not hold across the mortality distribution. A series of Wald tests confirmed this varying inequality–mortality relationship, especially between the lower and upper tails. The large variation in the estimated coefficients of the Gini index suggested that inequality had the greatest influence on those counties with a mortality rate of roughly 9.95 deaths per 1000 population (80th percentile) compared to any other counties. Furthermore, our results suggest that the traditional analytic methods that focus on mean or median value of the dependent variable can be, at most, applied to a narrow 20 percent of observations. This study demonstrates the value of QR. Our findings provide some insight as to why the existing evidence for the inequality–mortality relationship is mixed and suggest that analytical issues may play a role in clarifying whether inequality is a robust determinant of population health.
    關聯: Social Science and Medicine 74(12), pp.1900-1910
    DOI: 10.1016/j.socscimed.2012.02.029
    显示于类别:[統計學系暨研究所] 期刊論文

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