Ratio Test for Mean Changes in Time Series with Heavy-Tailed AR( p ) Noise Based on Multiple Sampling Methods

Tianming Xu and Yuesong Wei ()
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Tianming Xu: School of Mathematical Science, Huaibei Normal University, Huaibei 235099, China
Yuesong Wei: School of Mathematical Science, Huaibei Normal University, Huaibei 235099, China

Mathematics, 2023, vol. 11, issue 18, 1-14

Abstract: This paper discusses the problem of the mean changes in time series with heavy-tailed AR( p ) noise. Firstly, it proposes a modified ratio-type test statistic, and the results show that under the null hypothesis of no mean change, the asymptotic distribution of the modified statistic is a functional of Lévy processes and the consistency under the alternative hypothesis is obtained. However, a heavy-tailed index exists in the asymptotic distribution and is difficult to estimate. This paper uses bootstrap sampling, jackknife sampling, and subsampling to approximate the distribution under the null hypothesis, and obtain more accurate critical values and empirical power. In addition, some results from a small simulation study and a practical example give an idea of the finite sample behavior of the proposed statistic.

Keywords: ratio test; heavy tailed; limit distribution; bootstrap; jackknife; subsampling (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2023
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