Maximum likelihood estimation for α-stable double autoregressive models

doi:10.1016/j.jeconom.2023.04.011

2023-09-01

PRE

DOI：10.1016/j.jeconom.2023.04.011

原文链接

原文求助

摘要

En 中文

The paper investigates the maximum likelihood estimation (MLE) for a first-order double autoregressive model with standardized non-Gaussian symmetric & alpha;-stable innovation (sDAR) within a unified framework of stationary and explosive cases. It is shown that the MLE of all parameters, including the stable exponent in the innovation, are strongly consistent and asymptotically normal (with the exception of the intercept for the explosive case). Particularly, the MLE of the parameter in the conditional location is always asymptotically normal, regardless of the stationary or explosive case. This point totally differs from that for linear & alpha;-stable AR models in Andrews et al. (2009). Furthermore, it is the first time to provide exact values of the quantities related to the innovation in the asymptotic covariance matrices when the true innovation is the standard Cauchy distribution. Additionally, a modified Kolmogorov-type test statistic is proposed for model diagnostic checking in the stationary case. Monte Carlo simulation studies are conducted to confirm our theoretical findings and assess the finite-sample performance of the MLE and the modified Kolmogorov-type test. An empirical example is analyzed to illustrate the usefulness of sDAR models. & COPY; 2023 Elsevier B.V. All rights reserved.

Keyword:

DAR model

Kolmogorov-type test

MLE

Nonstationarity

Stable distribution