Nonparametric regression under dependent errors with infinite variance

Peng, Liang and Yao, Qiwei ORCID: 0000-0003-2065-8486 (2004) Nonparametric regression under dependent errors with infinite variance. Annals of the Institute of Statistical Mathematics, 56 (1). pp. 73-86. ISSN 0020-3157

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Abstract

We consider local least absolute deviation (LLAD) estimation for trend functions of time series with heavy tails which are characterised via a symmetric stable law distribution. The setting includes both causal stable ARMA model and fractional stable ARIMA model as special cases. The asymptotic limit of the estimator is established under the assumption that the process has either short or long memory autocorrelation. For a short memory process, the estimator admits the same convergence rate as if the process has the finite variance. The optimal rate of convergence n−2/5 is obtainable by using appropriate bandwidths. This is distinctly different from local least squares estimation, of which the convergence is slowed down due to the existence of heavy tails. On the other hand, the rate of convergence of the LLAD estimator for a long memory process is always slower than n−2/5 and the limit is no longer normal.

Item Type:	Article
Official URL:	http://www.ism.ac.jp/editsec/aism-e.html
Additional Information:	© 2004 The Institute of Statistical Mathematics
Divisions:	Statistics
Subjects:	H Social Sciences > HA Statistics
Date Deposited:	18 Feb 2009 15:46
Last Modified:	01 Oct 2024 03:32
URI:	http://eprints.lse.ac.uk/id/eprint/22874

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