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A non-parametric ANOVA-type test for regression curves based on characteristic functions : an ANOVA-type test for regression curves

Pardo Fernández, Juan CarlosAutor UVIGO; Jiménez-Gamero, María Dolores; El Ghouch, Anouar
Date: 2015-03
UNIVERSAL IDENTIFIER: http://hdl.handle.net/11093/1025
EDITED VERSION: http://doi.wiley.com/10.1111/sjos.12102
UNESCO SUBJECT: 12 Matemáticas
DOCUMENT TYPE: article

Abstract

This article studies a new procedure to test for the equality of k regression curves in a fully nonparametric context. The test is based on the comparison of empirical estimators of the characteristic functions of the regression residuals in each population. The asymptotic behaviour of the test statistic is studied in detail. It is shown that under the null hypothesis the distribution of the test statistic converges to a finite combination of independent chi-squared random variables with one degree of freedom. The coefficients in this linear combination can be consistently estimated. The proposed test is able to detect contiguous alternatives converging to the null at the rate n-1/2. The practical performance of the test based on the asymptotic null distribution is investigated by means of simulations.
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