Title: Generalized variance ratio tests in the presence of statistical dependence.
Authors: NANKERVIS John CKOUGOULIS PERIKLISCOAKLEY Jerry
Citation: JOURNAL OF TIME SERIES ANALYSIS vol. 36 no. 5 p. 687–705
Publisher: WILEY-BLACKWELL
Publication Year: 2015
JRC N°: JRC94131
ISSN: 0143-9782
URI: http://onlinelibrary.wiley.com/doi/10.1111/jtsa.12124/abstract?systemMessage=Wiley+Online+Library+will+have+be+unavailable+on+Saturday+5th+December+from+10%3A00-14%3A00+GMT+%2F+05%3A00-09%3A00+EST+%2F+18%3A00-22%3A00+SGT+for+essential+maintenance.+Apologi
http://publications.jrc.ec.europa.eu/repository/handle/JRC94131
DOI: 10.1111/jtsa.12124
Type: Articles in periodicals and books
Abstract: This article extends and generalizes the variance-ratio (VR) statistic by employing an estimator of the asymptotic covariance matrix of the sample autocorrelations. The estimator is consistent under the null for general classes of innovations exhibiting statistical dependence including exponential generalized autoregressive conditional heteroskedasticity and non-martingale difference sequence processes. Monte Carlo experiments show that our generalized test statistics have good finite sample size and superior power properties to other recently developed VR versions. In an application to two major US stock indices, our new generalized VR tests provide stronger rejections of the null than do competing VR tests.
JRC Directorate:Space, Security and Migration

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