Econometrica: May 1976, Volume 44, Issue 3
The Interpolation of the Lorenz Curve and Gini Index from Grouped Data
Joseph L. Gastwirth, Marcia GlaubermanThis 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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