Distributional Changes in U.S. Dietary Quality 1989-2008-1989-2008年美国饮食质量分布变化

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英文文献：Distributional Changes in U.S. Dietary Quality 1989-2008-1989-2008年美国饮食质量分布变化
英文文献作者：Beatty, Timothy K.M.,Lin, Biing-Hwan,Smith, Travis A.
英文文献摘要：
This paper uses stochastic dominance to measure changes in the distribution of overall dietary quality in the U.S. over the period 1989{2008. Diet quality is often used as as a proxy for wellbeing and an outcome variable for a wide variety of interventions. For the population as a whole, we find significant improvements in diets across all levels of dietary quality. Further, we find improvements for both low-income and higher-income individuals alike. We show that the improvements vary between these groups with regards to the timing and distributional location. Further, we find that over half of the improvement for all individuals can be explained by changes in food formulation and changes in demographics.

本文使用随机优势度来衡量1989年(2008年)美国整体膳食质量分布的变化。饮食质量经常被用作健康的代理和各种干预措施的结果变量。对于整个人口来说，我们发现饮食质量在各个层次都有显著改善。此外，我们发现低收入和高收入人群的情况都有所改善。我们表明，改善在这些组之间的时间和分布位置不同。此外，我们发现超过一半的改善可以解释为食品配方的变化和人口统计的变化。

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