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Health Econ. 2011 Oct;20(10):1155-60. doi: 10.1002/hec.1752. Epub 2011 Jun 15.

The concentration index of a binary outcome revisited.

Author information

1
Development Research Group, World Bank, Washington, DC, USA. awagstaff@worldbank.org

Abstract

The binary variable is one of the most common types of variables in the analysis of income-related health inequalities. I argue that while the binary variable has some unusual properties, it shares many of the properties of the ratio-scale variable and hence lends itself to both relative and absolute inequality analyses, albeit with some qualifications. I argue that criticisms of the normalization I proposed in an earlier paper, and of the use of the binary variable for inequality analysis, stem from a misrepresentation of the properties of the binary variable, as well as a switch of focus away from relative inequality to absolute inequality. I concede that my normalization is not uncontentious, but, in a way, that has not previously been noted.

PMID:
21674677
DOI:
10.1002/hec.1752
[Indexed for MEDLINE]

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