Authors: Schmidt, Sara
Wornowizki, Max
Fried, Roland
Dehling, Herold
Title: An asymptotic test for constancy of the variance under short-range dependence
Language (ISO): en
Abstract: We present a novel approach to test for heteroscedasticity of a non-stationary time series that is based on Gini's mean difference of logarithmic local sample variances. In order to analyse the large sample behaviour of our test statistic, we establish new limit theorems for U-statistics of dependent triangular arrays.We derive the asymptotic distribution of the test statistic under the null hypothesis of a constant variance and show that the test is consistent against a large class of alternatives, including multiple structural breaks in the variance. Our test is applicable even in the case of non-stationary processes, assuming a locally stationary mean function. The performance of the test and its comparatively low computation time are illustrated in an extensive simulation study. As an application, we analyse data from civil engineering, monitoring crack widths in concrete bridge surfaces.
Subject Headings: change-point analysis
tests for heteroscedasticity
U-statistics of triangular arrays
short-range dependence
Subject Headings (RSWK): Change-point-Problem
Issue Date: 2020
Appears in Collections:Sonderforschungsbereich (SFB) 823

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