Change-point estimation in ARCH models

Abstract

The paper studies the change-point problem and the cross-covariance function for ARCH models. Bounds for the cross-covariance function are derived and explicit formulae are obtained in special cases. Consistency of a cusum type change-point estimator is proved and its rate of convergence is established. A Hájek-Rényi type inequality is also proved. Results are obtained under weak moment assumptions.