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Stata J. 2016 1st Quarter;16(1):112-138.

conindex: Estimation of concentration indices.

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Erasmus School of Economics Erasmus University Rotterdam, the Netherlands Tinbergen Institute, the Netherlands and University of Macedonia, Greece.
Department of Health Services Research and Policy-London School of Hygiene and Tropical Medicine, UK
Erasmus School of Economics Erasmus University Rotterdam, the Netherlands and Tinbergen Institute, the Netherlands.
Division of Health Services Research and Management School of Health Sciences and City Health Economics Centre City University London, UK.


Concentration indices are frequently used to measure inequality in one variable over the distribution of another. Most commonly, they are applied to the measurement of socioeconomic-related inequality in health. We introduce a user-written Stata command conindex which provides point estimates and standard errors of a range of concentration indices. The command also graphs concentration curves (and Lorenz curves) and performs statistical inference for the comparison of inequality between groups. The article offers an accessible introduction to the various concentration indices that have been proposed to suit different measurement scales and ethical responses to inequality. The command's capabilities and syntax are demonstrated through analysis of wealth-related inequality in health and healthcare in Cambodia.


concentration index; health; healthcare; inequality; rank-dependent indices


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