Econometrica: May 1976, Volume 44, Issue 3

The Interpolation of the Lorenz Curve and Gini Index from Grouped Data

https://doi.org/0012-9682(197605)44:3<479:TIOTLC>2.0.CO;2-Z
p. 479-483

Joseph L. Gastwirth, Marcia Glauberman

This paper applies a simple heuristic interpolator to estimating the Lorenz curve from grouped data. Precise conditions are given to insure that the method yields a convex curve. The results are illustrated on United States tax data.
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