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Asymptotic Theory for M-Estimates in Unstable AR(p) Processes with Infinite Variance Innovations (1506.05830v2)

Published 18 Jun 2015 in stat.AP, math.ST, and stat.TH

Abstract: In this paper, we present the asymptotic distribution of M-estimators for parameters in non-stationary AR(p) processes. The innovations are assumed to be in the domain of attraction of a stable law with index $0<\alpha\le2$. In particular, when the model involves repeated unit roots or conjugate complex unit roots, M-estimators have a higher asymptotic rate of convergence compared to the least square estimators and the asymptotic results can be written as It^{o} stochastic integrals.

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