SFB 303 Discussion Paper No. A - 160
Author: Härdle, Wolfgang, and Michael Jerison
Title: Cross Section Engel Curves over Time
Abstract: Methods for nonparametric estimation and comparison of cross section Engel curves are presented and
applied to U.K. expenditure data. Real Engel curves (with quantity demanded and real total expenditure on the
axes) vary over time, but their shapes are generally quite stable. Mean normalized Engel curves are defined and
are found not to vary greatly over time. Consequences of such invariance for the testing of microeconomic
demand models are investigated.
Keywords: Engel Curves, Cross Section, Nonparametric Smoothing, Invariance
Creation-Date: February 1988
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