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• W1606239282 abstract "The problem introduced by grouping income data when measuring socioeconomic inequalities in health (and health care) has been highlighted in a recent study in this journal. We re(examine this issue and show there is a tendency to underestimate the concentration index at an increasing rate when lowering the number of income categories. This bias results from a form of measurement error and we propose two correction methods. Firstly, the use of instrumental variables (IV) can reduce the error within income categories. Secondly, through a simple formula for correction that is based only on the number of groups. We compare the performance of these methods using data from 15 European countries and the United States. We find that the simple correction formula reduces the impact of grouping and always outperforms the IV approach. Use of this correction can substantially improve comparisons of the concentration index both across countries and across time." @default.
• W1606239282 created "2016-06-24" @default.
• W1606239282 creator A5040358679 @default.
• W1606239282 creator A5072230333 @default.
• W1606239282 date "2009-01-01" @default.
• W1606239282 modified "2023-09-23" @default.
• W1606239282 title "Correcting the Bias in the Concentration Index When Income is Grouped" @default.
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• W1606239282 doi "https://doi.org/10.2139/ssrn.1508385" @default.
• W1606239282 hasPublicationYear "2009" @default.
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