SFB 303 Discussion Paper No. A - 199

Author: Härdle, W., and J. D. Hart
Title: A Bootstrap Test for Positive Definiteness of Income Effect Matrices
Abstract: Positive definiteness of income effect matrices provides a sufficient condition for the law of demand to hold. Given cross section household expenditure data, empirical evidence for the law of demand can be obtained by estimating such matrices. Härdle, Hildenbrand and Jerison (1988) used the bootstrap method to simulate the distribution of the smallest eigenvalue of random matrices and to test their positive definiteness. Here, Theoretical aspects of this bootstrap test of positive definiteness are considered. The asymptotic distribution of the smallest eigenvalue, lambda hat, of the matrix estimate is obtained. This theory applies generally to symmetric, asymptotically normal random matrices. A bootstrap approximation to the distribution of lambda hat is shown to converge in probability to the asymptotic distribution of lambda hat. The bootstrap test is illustrated using British family expenditure survey data.
Keywords: Bootstrap, central limit theorem, average derivative estimation (ADE), kernel estimator, U -statistics.
Creation-Date: March 1989
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