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Using the P90/P10 Index to Measure U.S. Inequality Trends with Current Population Survey Data: A View From Inside the Census Bureau Vaults

Author

Listed:
  • Richard Burkhauser
  • Shuaizhang Feng
  • Stephen Jenkins

Abstract

The March Current Population Survey (CPS) is the primary data source for estimation of levels and trends in labor earnings and income inequality in the USA. Time-inconsistency problems related to top coding in theses data have led many researchers to use the ratio of the 90th and 10th percentiles of these distributions (P90/P10) rather than a more traditional summary measure of inequality. With access to public use and restricted-access internal CPS data, and bounding methods, we show that using P90/P10 does not completely obviate time inconsistency problems, especially for household income inequality trends. Using internal data, we create consistent cell mean values for all top-coded public use values that, when used with public use data, closely track inequality trends in labor earnings and household income using internal data. But estimates of longer-term inequality trends with these corrected data based on P90/P10 differ from those based on the Gini coefficient. The choice of inequality measure matters.

Suggested Citation

  • Richard Burkhauser & Shuaizhang Feng & Stephen Jenkins, 2007. "Using the P90/P10 Index to Measure U.S. Inequality Trends with Current Population Survey Data: A View From Inside the Census Bureau Vaults," Working Papers 07-17, Center for Economic Studies, U.S. Census Bureau.
    • Handle: RePEc:cen:wpaper:07-17
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    File URL: https://www2.census.gov/ces/wp/2007/CES-WP-07-17.pdf
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    JEL classification:

    • D3 - Microeconomics - - Distribution
    • J3 - Labor and Demographic Economics - - Wages, Compensation, and Labor Costs
    • C8 - Mathematical and Quantitative Methods - - Data Collection and Data Estimation Methodology; Computer Programs

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